(magnified four
times).

2_d._ _Conchoderma virgata_ var. _Olfersii_, (scutum.)

3. _Conchoderma Hunteri_, (magnified five times.)

4. _Conchoderma aurita_, (nat. size,) with the rudimentary carina
exhibited on the right hand.

4_a._ _Conchoderma aurita_, summit of capitulum, viewed from
vertically above, showing the ear-like appendages and the
rudimentary terga.

4_b._ _Conchoderma aurita_, section near the bases of the ear-like
appendages, showing their folds.

4_c._ _Conchoderma aurita_, (var.), scutum.

5. _Alepas minuta_, (magnified five times.)

6. _Alepas cornuta_, (magnified five times.)

TAB. IV.

Fig.

1. _Anelasma squalicola_, (copied from Loven.) The ovigerous
lamellae are seen within the edges of the aperture of the
capitulum. Enlarged about one and a half times.

2. _Anelasma squalicola_, (from Loven), with the membranes removed
from one side of the capitulum and of the peduncle,
exhibiting the body.

(_a._) External membrane of the capitulum.

(_a, a._) Inner membrane of ditto, lining the sack, and
separated from the external membrane by a double fold of
corium.

(_b._) The ovigerous lamellae, the edge projecting beyond the
orifice of the capitulum.

(_c._) Penis, succeeded by six pairs of rudimentary cirri.

(_d._) Probosciformed mouth.

(_e._) Orifice of the acoustic (?) sack.

(_f._) Ovigerous fraenum.

(_g._) Ovarian branching tubes filling up the peduncle.

(_h._) Outer integument of peduncle, lined by corium and
muscles, continuous with the outer membrane (_a_) of the
capitulum.

3. _Anelasma squalicola_, Small portion of the outer integument
of the peduncle, greatly magnified, exhibiting the natural
lines of splitting, and showing that it is composed of
several distinct portions or layers, which are displayed by
the corners having been turned over. Three of the branching
filaments, filled with pulpy corium, are given; the others
have been cut off. The membrane (_a_) extends under (_b_),
but not under the circular patches of membrane, (_c, c_.)

4. _Anelasma squalicola._ Mandibles, seen from the side towards
the maxillae.

5. _Anelasma squalicola._ Mandibles, seen from the side towards