TAB. VI.
Fig.
1. _Scalpellum ornatum_, (female, magnified seven times.)
1_a"._ _Scalpellum ornatum_, Upper latus, viewed internally.
1_b"._ _Scalpellum ornatum_, Scutum of full-grown specimen, viewed internally, much magnified.
(_a._) Depression for the adductor muscle.
(_b._) Depression for the reception of the male.
1_c"._ _Scalpellum ornatum_, cutum of half-grown specimen, viewed internally, much magnified, on same scale with fig. 1 _b"_.
The depression (_b_) for the reception of the male is here seen, in almost the first stage of formation.
1_d"._ _Scalpellum ornatum._ An imaginary section through the cavity (_x_) in which the male is lodged.
(_a._) Section of the sh.e.l.l of the scutum of the female.
(_b._) A layer of chitine h.o.m.ologous with the sh.e.l.l, and _partially_ lining the scutum.
(_c._) The inner lining (of chitine) of the sack of the female.
(_d._) A double fold of corium.
2. _Scalpellum rutilum_, (magnified two and a half times).
2_a"._ _Scalpellum rutilum_, Internal view of scutum, enlarged.
(_a._) Depression for the adductor muscle.
(_b._) Cavity for the reception of the male.
2_b"._ _Scalpellum rutilum_, External view of carina.
2_c"._ _Scalpellum rutilum_, Section across middle of carina.
3. Complemental Male of _Scalpellum Peronii_, greatly magnified.
4. Complemental Male of _Scalpellum villosum_, greatly magnified.
(_a"._) Natural size.
4, _a, b, c._ Ditto, valves separated.
(_a._) Scutum.
(_b._) Tergum.
(_c._) Carina.
5. Complemental Male of _Scalpellum rostratum_, a restored figure, greatly magnified. Scutum and rudimentary carina correct.
6. _Scalpellum Peronii_, one and a half the natural size.
(_a._) Rostrum a little more enlarged, front view of.
7. _Scalpellum rostratum_, magnified six times.
(_a._) Rostrum, front view of.
8. _Scalpellum villosum_, magnified one and a half the natural size.
8_a_, _b._ _Scalpellum villosum_
(_a._) Internal view of rostrum.
(_b._) Internal view of sub-rostrum.
TAB. VII.
Fig.
1. _Pollicipes cornucopia_, (one and a half nat. size.)
1_a._ _Pollicipes cornucopia_, internal view of valves.
2. _Pollicipes polymerus_, (one and a half nat. size.)
2_a._ _Pollicipes polymerus_, internal view of valves.
3. _Pollicipes mitella_, nat. size.
3_a"._ _Pollicipes mitella_, nat. size, internal views of
(_a._) Scutum, and of
(_b._) Tergum, showing articular fold.
3_b"._ _Pollicipes mitella_, Internal view of other valves, in a small specimen, showing the manner in which the valves of the lower whorl overlap each other.
(_a._) Upper latera.
(_b._) Carina,
(_c._) Sub-carina, both viewed a little obliquely.