PATAGONIAN PROVINCE. 83 
Natica limbata. *Patella barbara. 
Lamellaria antarctica. *- ,, zebrina. 
Littorina caliginosa. Siphonaria lateralis. 
Chemnitzia Americana. Chiton setic¢er. 
*Scalaria brevis. Doris luteola. 
*Trochita pileolus. JHolis Patagonica. 
Crepidula Patagonica. *Spongiobranchea. 
Trochus Patagonicus. Spiralis? cucullata, 66° S. 
*Margarita Malvine, 
*Scissurella conica. 
*Fissurella radiosa. * 
Puncturella ccnica. 
Nacella cymbularia. 
*Patella deaurata. 
Pecten corneus. 
Mytilus Magellanicus, 
*Modiolarca trapezina. 
Leda sulculata, 
*Cardita Thouarsii. 
*Astarte longirostris. 
*Venus exalbida. 
*Cyamium antarcticum. 
Mactra edulis. 
Terebratella crenulata. *Lyonsia Malvinensis. 
» Magellanica,many Pandora cistula. 
varieties. Saxicava antarctica. 
Waldheimia dilatata. Octopus megalocyathus. 
Pecten Patagonicus. 
XVI. PATAGONIAN PROVINCE. 
From §. Catharina, south of the Tropic, to P. Melo. This 
coast-line has shifted considerably since the era of its present 
fauna. M. D’Orbigny and Mr. Darwin observed banks of recent 
shells, especially Potamomya labiata, in the valley of La Plata 
and the Pampas around Bahia Blanca. Mr. Cuming also met 
with Voluta Brasiliana, and other living shells, in banks 40 
miles inland. Of 79 shells obtained by M. D’Orbigny on the 
coast of N. Patagonia, 51 were peculiar, 1 common to the Falk- 
land Ids., and 27 to Maldonado and Brazil. At Maldonada 37 
species were found, 8 being special 10 common to N. Patagonia, 
2 to Rio, and 17 to Brazil. Of the latter 8 range as far as the 
Antilles; viz. : 
Crepidula aculeata. 
+»  protea. 
Pholas costata. 
Mactra fragilis. 
Venus flexuosa.* 
Lucina semi-reticulata. 
Modiola viator. 
Plicatula Barbadensis. 
At Bahia Blanca, in lat. 39° 8., the most abundant shells 
observed by Mr. Darwin (p. 243) were 
Oliva auricularia, 
» puelchana, 
M. D’Orbigny’s list also includes the following genera 
species :— 
Oliva tehuelchana. 
Voluta Brasiliana. 
Voluta angulata. 
Terebra Patagonica. 
and 
Octopus tehuelchus. ZEolis. Leda. 
Columbella sertularium. Paludestrina, Cytherea. 
Bullia globulosa. Scalaria. Petricola. 
Pleurotoma Patagonica. Natica. Corbula. 
Fissurellidea megatrema, Chiton, Pinna. 
Panopea abbreviata. Solen. Mytilus, 
Periploma compressa. Lutraria, Lithodomus. 
Lyonsia Patagonica. Donacilla. Pecten. 
Solecurtus Platensis. Nucula. Ostrea. 
* The variety of Venus flexuosa found at Rio can be distinguished from the Weel 
{ndian shell, which is the Venus punctifera of Gray. 
