34 
302. 
303. 
306. 
307. 
308. 
T. luctuosus is only an umbilicated variety of T. ater. 
SHELLS OF SOUTH AMERICA. 
Srgarerus cymMBA, Menke, d’Orb. Voy. v. 404. 
t. 57. f. 3-6. 
Sigaretus concavus, Sow. 
Peru. 
Fam. 6. NERITIDZ. 
Ner Tina MELEAGRIS, Lamk., d’Orb.Voy. v. 405. 
t. 56. f. 1-3. 
Brazils. 
. Nerivina vincinea, Lamk., d’ Orb. Voy. v. 406. 
Nevita virgioea, Linn. 
Brazils. 
. Nerivina Fonraingeana, d’Orb. Voy. v. 406. 
f. 70, 1.14, 15. 
Tuo de Guayaquil. 
Fam. 7. TROCHIDA. 
TROCHUS ARTICULATUS, Gray, d’Orb. Voy. v. 407. 
Brazils. 
Trocuus Paraconicus, d’ Orb. Voy. v. 408. t, 55. 
f. 1-4. 
Patagonia. 
Trocnus auapricosratus, Gray, d’Orb. Voy. v. 
408. 
Chili. 
. Trocuus ATER, Lesson, d’Orb. Voy. v. 409. 
Chili. 
. Trocaus Luctuosus, d’Orb. Voy. v. 409. t. 76. 
f. 16-19. 
Peru; Chili. 
often strongly keeled. 
B.M. 
B.M. 
B.M. 
B.M. 
B.M. 
B.M. 
B.M. 
B.M. 
B.M. 
It is 
