204 MR. BRODERIP’S DESCRIPTIONS OF SOME 
Hab. ad Peruviam. (Lobos Island.) 
Approaching the last, but differing in being always more flattened, in the compara- 
tively great size of the vaulted spines, and in the comparatively wide interval between 
them. Still I would not be positive that both are not varieties of Crepidula acu- 
leata, Lam. 
25. CaLyPpTRHA PALLIDA. 
Tab. XXIX. Fig. 3. 
Cal. test sordidé alba, ovatd ; apice prominente. 
Diam. 2 poll., lat. 5, alt. 2. 
Hab. ad Insulas Falkland dictas. 
Found under stones. 
Subgenus Crepipuna, Less. 
Lamina subrecta, apice postico et submedio. 
26. CrepPipuLA UNGUIFORMIS, Lam. 
Varietas complanato-recurva. 
Tab. XXIX. Fig. 4. 
Long. 12 poll., lat. ¢. 
Hab. ad Insulam Chiléen et ad Panamam. 
This variety affords a good example of the powers of adaptation of the animal. The 
shell is either flattened or concave on the back, and recurved, in consequence of its 
adhesion to the inside of dead shells of Ranelle Vewillum, celata, &c. 
It was dredged from sandy mud, at a depth ranging from four to ten fathoms. 
27. Catyptr#a LEssonit. 
Tab. XXIX. Fig. 5. 
Cal. testa complanatd, subconcentricé foliaced, foliis tenuibus, alba fusco longitudinaliter 
strigatd, intts albidd, limbo interno interdum fusco ciliato-strigato. 
Long. 1,3, poll., lat. +3, alt. ¢. 
Hab. in sinu Guayaquil. (Island of Muerte.) 
This beautiful species, which I have named in honour of M. Lesson, was found under 
stones at low water. It will remind the observer of the upper valves of some of the 
Chame. 
28. CALYPTRHA INCURVA. 
Tab. XXIX. Fig. 6. 
Cal. testd fusco-nigricante, tortuosd, corrugatd, intus nigricante, septo albo ; apice adunco. 
Long. £ poll., lat. +, alt. 3. 
Hab. ad Sanctam Elenam et ad Xipixapi. 
