22 GASTEROPODA. EOLIDIAD. 
This very rare species was first discovered in Bigbury Bay, 
by Montagu; it was afterwards taken in Plymouth Sound, by 
Mr. Cranch ; below Padstow, by myself, and in Bideford Bay, 
by Mr. J. Raddon. 
FAMILY II. EOLIDIADZ. 
Polybranches, Blainville. 
Branchie \atera dorsiimbricantes. Anus et Seeuum Organa 
lateralia, dextra, apertura communi. Pallivm non dilatatum. 
Tentacula duo labialia; quatuor dorsalia, anteriora, subannulata. 
Os labio crasso. Mandibule uulle. 
Branchiee imbricating the sides of the back. Anus and sex- 
ual organs situated on the right side, and furnished with a 
common external aperture. Mantle not dilated. Tentacula 
two labial; four dorsal, slightly annulated. Mouth with a 
thick lip, and no mandibles. 
The presence of the labial tentacula has induced me to place 
this family after Doridide, and before Tritoniade. 
Tne Chevalier Cuvier is of opinion that Doris cerulea of 
Montagu (Trans. Linn. Soc. vii. t. 7. fig. 4) and Doris longi- 
cornis of the same author (vol. ix. t. 7. fig. 1) belong to the 
genus Holidia ; whilst the latter species is referred by Blainville 
to the genus Cavolina of Bruguitre. As I have seen neither 
of these animals in a living state, it will be most prudent to say 
nothing on the subject. 
Genus 7. Eourpia. 
Eolidia, Cuvier, Blainville. 
Eolis, Cuvier, Lamarck. 
Branchie foliaceee. Tentacula teretiuscula, acuminata, ad 
apices acuta. Corpus posticé acuminatum. 
Tentacula rounded acuminate, their pots acute. Body 
acuminate behind. Heart situated in the back, between the 
branchie. 
This genus was instituted by Cuvier, in 1798. 
XK 
