30 SHELLS OF NEW ENGLAND. 
amend, Say. Lottia testudinalis, Forbes. Gould, 
153, f.12. Acmea testudinalis, Hanley. — Litt. Whole 
Coast. 
T. atveus, St. Patella alveus, Con., 1830. Loltia al- 
veus, Gould, 154, f. 18. — Litt. Whole Coast. At 
Bird Island, in Boston Harbor, this species occurs 
abundantly upon stones and shells, still retaining its 
characters; which is sufficient to show that it is not 
a variety of the last. 
CALYPTRAIDA. 
CaLYPTR&A sTRIATA, Say, J. A. N.S, v. 216, 1825. — 
Lamin. Whole coast. Eastport Harbor, 4f. (W. 8.) 
Portland Harb. (Migh.) St. George’s Banks, (W. 
S.) Nantucket, (Ag.) 
CrepipuLa FornicaTa, Lam. Say. Gould, 158, f. 17. 
Patella f., Lin. Crepidula glauca, Say. Gould. — 
Lamin. Whole Coast. 
C. uncuirormis, Lam. C. plana, Say. Gould, 159, f. 16. 
—lLamin. Whole Coast. C. fornicata, as well as 
this species, sometimes occurs in the apertures of uni- 
valves, where it preserves its color, convexity, and oth- 
er characters. 
C. convexa, Say. Gould, 160, f. 15.— Litt. Lamin. 
From Mass. Bay southward. 
FISSURELLID. 
Diapora Noacuina, Gray. Patella Noachina, Lin. 
Cemoria Noachina, Gould, 156, f. 18. C. princeps, 
