GASTEROPODA. DORIDIDZ. 19 
to be Doris Argo, a species that has not yet been discovered 
in our seas. 
2. Doris BRITANNICA. 
D. convexa, verrucis plano-convexis, branchiis 10-radiatis. Co- 
lor croceus, aut albo purpureoque varius. 
Long. 2 poll. 
Habitat ad littora scopulosa Britanniee, vulgatissima. 
Body convex, the warts plano-convex, the branchiz com- 
posed of ten rays. Colour saffron, or variegated with white 
and purple. Length 2 inches. 
I have found this species on all the rocky coasts that I have 
visited. It is common in Arran and Bute; in the Hebrides ; 
in the Frith of Forth; on the northern and southern coasts of 
Cornwall and Devon; on the Kentish coasts ; on the coast of 
South Wales ; on the southern coast of Ireland ; and I have 
received it from my friend J. Henslow, Esq., who found it in 
the Isle of Man, where he observed it in abundance. 
3. Doris VULGARIS. 
D. convexiuscula, verrucis prominentibus convexis, branchiis 
14-radiatis. 
Doris verrucosa, Penn. Brit. Zool. iv. 43. pl. 21. fig. 23. 
Color albicans, pallidé brunneo nonnunquam varius. Long. 
corp. + poll. 
Body rather convex ; the warts convex and prominent ; the 
branchize with fourteen rays. Colour whitish, sometimes va- 
riegated with pale brown. Length half an inch. 
Inhabits all the rocky shores of Great Britain, and is some- 
times taken by the dredge in deep water. 
It appears to be Pennant’s Doris verrucosa, but it is in no 
way allied to the D. verrucosa of Linné, which is a large spe- 
cies, inhabiting the Indian Ocean. 
4. Doris ROcINELA. 
D. convexiuscula, verrucis longiusculis acuminatis. 
Long. corp. 4 poll. 
Habitat in mari Cantiano, prope Sandgate et Dover. 
