A Monograph on the Sub-class Cirripedia Part 38

(_g._) Branching ovarian tubes within the peduncle.

(_h._) Male, on the same scale, lying in its natural position within the sack, with the lower part of its peduncle bent upwards, and imbedded in the corium and muscles of the female.

(_i._) Adductor scutorum muscle.

8_b'._ _Ibla c.u.mingii_, Internal view of the scutum and tergum, and of the upper part of the outer integument of the peduncle, with its h.o.r.n.y spines magnified about three times.

8_c'._ _Ibla c.u.mingii_, A small portion of the outer integument of the peduncle, greatly magnified, showing the h.o.r.n.y persistent spines; two of the spines have been torn out.

9. _Ibla quadrivalvis_; internal view of scutum and tergum, and of the upper part of the outer integument of the peduncle; magnified four times.

9_a'._ _Ibla quadrivalvis_, p.e.n.i.s supported on a long unarticulated projection; greatly magnified.

TAB. V.

Fig.

1. Male of _Ibla c.u.mingii_, magnified thirty-two times.

(_a._) Mouth.

(_b._) A slight double fold, formed by the basal edge of the labrum, and by a lower fold, which at (_h_) becomes well developed; the latter is a rudimentary representation of the double membrane and valves forming the capitulum.

(_c._) Eye.

(_d, d._) Torn membrane from the sack of the female, constricted round the body of the male.

(_e._) Terminal or basal point, with the prehensile larval antennae, represented on rather too large a scale.

(_f._) The imbedded portion of the male.

(_g._) Two pairs of cirri.

(_h._) The fold above alluded to, concealing a small portion of the slightly retracted thorax.

2. The male of _Ibla c.u.mingii_, viewed from vertically above; magnified about sixty times. The dotted lower portion, represents the outline of the thorax and the positions of the cirri, which, from standing below the mouth, could not be well seen, when the summit of the mouth was in the proper focus.

(_a._) Labrum, largely bullate.

(_b._) Palpi.

(_c._) Mandibles.

(_d._) Maxillae.

(_e._) Outer maxillae; between which and the crest of the labrum, the orifice of the oesophagus can be obscurely seen.

(_f._) a.n.u.s.

(_g._) Rudimentary caudal appendages, under which is the pore leading from the vesiculae seminales.

(_h._) Posterior cirrus. (_i._) Anterior cirrus.

3. Male of _Ibla c.u.mingii_; labrum and palpi, as seen with the eye on a level with the summit of the mouth.

4. Male of _Ibla c.u.mingii_, Posterior cirrus (_h_ in fig. 2) much magnified.

5. Male of _Ibla c.u.mingii_, Larval antennae; from the terminal point of the body (_e_ in fig. 1), as seen with a 1/8th of an inch object gla.s.s.

6. Male of _Ibla c.u.mingii_, Outer maxillae.

7. Male of _Ibla c.u.mingii_, Mandibles, with the underlying articulated membrane, forming the side of the mouth.

8. Male of _Ibla c.u.mingii_, Maxillae, with the apodeme.

9. Complemental Male of _Scalpellum vulgare_, attached over the fold in the occludent margin of the scutum of the hermaphrodite.

(_a._) Orifice of the sack of the male.

(_b._) Spinose projections above the rudimental valves; at the bottom of the figure are represented, as seen through the whole thickness of the animal, the prehensile larval antennae.

(_d._) The depression for the attachment of the adductor scutorum muscle of the hermaphrodite; see fig. 15 _a'_.

(_e_, _e._) A transparent layer of chitine, which forms a border to the occludent margin of the scutum of the hermaphrodite. This border supports long spines, which are connected with the underlying corium by sinuous tubuli.

10. The basal (normally anterior) portion of the above complemental Male, greatly magnified, viewed dorsally from above, exhibiting the larval prehensile antennae, attached to the antero-sternal surface of the animal.

11. One of the antennae of ditto, viewed laterally and on the outside.

12. Ditto, ultimate segment of.

13. Body of the above complemental male, consisting of the thorax supporting the four pairs of limbs, and of the terminal abdominal lobe.

14. Small portion of the outer integument of the complemental male, as seen with a 1/8th of an inch object gla.s.s.

15. _Scalpellum vulgare_ (hermaphrodite), magnified three times.

(_a, a._) Complemental males.

(_b._) Rostrum, of which a separate enlarged figure (_b'_) is given.

15_a'._ Scutum of the hermaphrodite _Scalpellum vulgare_, internal view of.

(_a._) Fold on the occludent margin.

(_d._) Pit for the adductor muscle.