48 SHELLS OF SOUTH AMERICA. 
versd, and differ in shape according to the form of the body to 
which they happen to be attached. It is doubtful if C. auricu- 
lata is distinct from them; it is probably only a variety living 
in more sheltered places, where the mantle is furnished with 
elongated bands forming tubular sheaths on the outer surface of 
the shell. In all the species the cup im the younger specimens 
is attached by a considerable portion of its outer surface to the 
disc of the shell; in the older ones, the lower part of it is only 
attached to the shell by a single point. 
411. CatyptR#A (TROCHATELLA) TROCHIFORMIS, 
d@’ Orb. Voy. v. 461. t. 59. f. 3. B.M. 
Lepas mtus-concamerata, Martini. 
Patella trochiformis, Chemn. 
Patella trochoides, Dillw. 
Trochus radians, Lamk. 
Calyptrza Araucana, Lesson. 
Chili and Peru. 
412. CaLypTR&A (TROCHATELLA) MAMILLARIS, d@’Orb. 
Voy. v. 462. B.M. 
Calyptrea mamillaris et C. lorica, Brod. 
Peru ; Payta to Guayaquil. 
413. CatyptR#A (TROCHATELLA) INTERMEDIA, 
d’Orb. Voy. v. 463. t. 59. f. 4-6. B.M. 
Peru. 
414. CALYPTR#HA (TROCHATELLA) PILEOLUS, d’Orb. 
Voy. v. 463. t. 78. f. 5, 6. B.M. 
Southern Patagonia; Falkland Islands. 
415. CREPIDULA ACULEATA, Lamk., d’ Orb.Voy. v. 464. 
t. 58. f. 4, 5. B.M. 
Patella aculeata, Gmelin. 
Brazils ; Patagonia. 
416. CreprpuLa Patraconica, d’Orb. Voy. v. 464. 
t. 58. f. 1-3. B.M. 
Patagonia. 
417. CREPIDULA PROTEA, d’Orb. Voy. v. 465. BM. 
East coast of America; Patagonia; Brazils. 
