MOLLUSCA. 
46 
and horny shell. The anus opens behind the hranchiee, and is 
frequently concealed under the lateral crests ; the vulva is before on 
the ri^ht, and the penis projects from under the right tentaculum. 
The seminal fluid is conducted in coitu, from the penis to the vulva 
by a groove, which extends from one to the other. An enormous 
membranous crop leads to a muscidar gizzard, armed internally with 
cartilaginous and jjyramidal corpuscles, which is followed by a third 
stomach sown with sharp hooks, and by a fourth in the form of 
a caecum. The intestine is voluminous, and the animal feeds on 
fucus. A limpid humour, secreted by a peculiar gland, and which 
in certain species is said to be extremely acrid, is exuded through an 
orifice near the vulva, and from the edges of the mantle oozes an 
abundant liquid of a deep purple colour, with which, when in danger, 
the animal tinges the water for a considerable extent. The ova are 
deposited in a kind of long, interlaced, glairy net work, of extreme 
tenuity. In the seas of Europe we have : 
Jp/. fasciata, Poiret ; Rang. ApL, pi. vi, vii. Black; margined 
with lateral red crests : one of the large species. 
Apl. punctata, Cuv.; Ann. du Mus., tome II, p. 287, pk E f- 
2 — 4; Rang, ApL, pi. xviii, f. 2. Lilac, sprinkled with greenish 
points. 
ApL depilans, L. ; Bohatsch., Anim. Mar. pi. i and ii ; Rang., 
pi. xvi. Blackish, with large greyish, clouded spots. 
Several other species are found in distant seas*. 
Dolabella, Lam. 
The Dolabellee only differ from the Aplysiae in the position of the 
branchije and their surrounding envelope ; they are at the posterior 
extremity of the body, which resembles a truncated cone. Their 
lateral crest presses closely on their branchial apparatus, merely 
leaving a narrow furrow ; their cell is calcareous. They are found 
in the Mediterranean and in the Indian Ocean. f 
Notarchus, Cuv. 
Have their lateral crests united and covering the back, a longitu- 
* ApJysia hrasiliana, Rang, pi. viii, 1, 2, 3; — A. dactyloniehi, Id., IX; — A. jJro- 
tca, Id., X, l ; — A. sorex, Id., X. 4, 5, 6 ; — A. figrina, Id., XI ;—A. inaculuta, Id. 
XII, 1 — 5 ; — A. marmonifa, Blainv. Journ. de PLj's., Janv., 1823, Rang, XII, 6, 7 ; 
— A. Keraudrcnii, Id., XIII ; — A. Lcssonii, Id., XIV — A. caniehis, Ciiv., Ann. du 
Mus., and Rang, XV, 1 ; — A. alba, Cuv., Ib., and Rang, XV, 2, 3 ; — A. napolitana, 
Id., XV, bis ; — A. rf/vsceJis, Risso, Hist. Nat. Mer., pi. 1,7. It is well, however, 
to observe, that most of the Aplysife having been drawn from specimens preserved in 
spirits, the truth of the specific characters of some of them may be doubted. 
t Dolabella Rumphii, Cuv., Ann. du Mus., V, x.xix, 1 : and Rumph. Thes. 
Amb., pi. X. 6, from the Molluccas, or Aplysia Rumphii, Rang, pi. i ; — Apl. ecauduta 
Rang, pi. ii ; — A. tnmcata. Id. ; — A. teremidi. Id. Ill, 1 ; — A. gigas. Id., Ill, 4 ; — 
A.IIasscllii, Id., XXIV, 1. 
X Notarchus ijelatinosus, Cuv., to which M. Rang associates the Bursutella Sarig- 
niana, Descr. de I’Eg., Zool., Caster., pi. ii, f. i, 2, and Rang, Apl., pi. xx, and his 
Apl. Pleii, pi. xxi, and some small species. 
