PATAGONIAN PROVINCE. 



83 



Natica limbata. 



Lamellaria antarotica. 



Littorina caliginosa. 



Chemnitzia Americana. 

 *Scalaria brevis. 

 *Trochita pileolus. 



Crepidula Patagonica. 



Troclius Patagonicus. 

 ^Margarita Malvinee. 

 *Scissurella conioa. 

 *Fissurella radiosa. 



Puncturella conica. 



Nacella cjonbularia, 

 *Patella deaurata. 



*Patella barbara. 



* „ zebrina. 

 Siphonaria lateralis. 

 Chiton setiger. 

 Doris luteola, 

 iEolis Patagonica. 



*Spongiobrancli8ea. 

 Spiralis? cucullata, 66' S. 



Terebratella crenulata. 



* „ Magellanica, many 



varieties. 

 Waldheimia dilatata. 

 Pecten Patagonicus. 



Pecten corneus, 



Mytilus Magellanicus. 

 *Modiolarca trapezina, 



Leda sulculata. 

 *Cardita Thouarsii. 

 *Astarte longirostris, 

 *Venus exalbida. 

 *Cyamium antarcticum. 



Mactra edulis. 

 *Lyonsia Malvinensis. 



Pandora cistula. 



Saxicava antarctica. 



Octopus megalocyathus. 



XVI. PATAGONIAJf PEOVIjSrCE. 



From S. Catliarina, 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 lahiata, in the valley of La Plata 

 and the Pampas around Bahia Blanca. Mr. Cuming also met 

 with Valuta BrasiUana, and other living shells, in banks 50 

 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 Mttldonada 37 

 species were found, 8 being special. 10 common to N. Patagonia, 

 2 to Eio, 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 Baa-badensis. 



At Bahia Blanca, in lat. 39^ S., the most abundant shells 

 observed by Mr. Darwin (p. 243) were 



Oliva auricularia. Oliva tehuelchana. Voluta angulata. 



„ puelchana. Voluta BrasiUana. Terebra Patagonica, 



M. D^Orbigny's list also includes the following genera and 

 species : — 



^olis. 



Paludestrlna. 



Scalaria. 



Natica. 



Chiton. 



Solen. 



Lutraria. 



Donacilla, 



Nucula. 



Octopus tehuelchus. 

 Columbella sertularium. 

 BuUia globulosa. 

 Pleurotoma Patagonica. 

 FissurellidBsa megatrema. 

 Panopsea abbreviata. 

 Periploma compressa. 

 Lyonsia Patagonica. 

 Solecurtua Platensis. 



Leda. 



Cytherea. 



Petricola. 



Corbula. 



Pinna. 



Mytilus. 



Lithodomus. 



Pecten. 



Ostrea. 



* The variety of Venus flexuosa found at Rio can be distinguished from the West 

 Indian shell, which is the Venus punctifera of Gray. 



