378 



MANUAL OF THE MOLLUSGA. 



Doris luteola. Waldheimia clilatata. 



^olis Patagonica. Pectea Patagonicus. 

 ''^Spongiobrancbsea. „ corneus. 



Spinalis? cucullata, 66° S. Mytilus Magellanicus. 



*Modiolarca trapezina. 



Terebratella crenulata. Leda sulculata. 



!«■ „ Magellauica, many *Cavdita Thouai-siL 



varieties. *Astarte iDngirostris. 



*Veuus exalbida. 

 ^Cyamium antarcticum. 



Mactra edulis. 

 ^Lyonsia Malvinensis. 



Pandora cistxila. 



Saxicava antarctica. 



Boltenia coacta. 



Octopus megalocyathus. 



XVI. Patagonian Province. 



"From S. Catharina, south of the Tropic, to P. Melo. This coast-liae has 

 shifted considerably since the era of its present fauna. M. D'Orbigny and 

 Mr. Darwin observed banks of recent shells, especially Potamomya labiata, 

 iu the valley of the La Plata and the Pampas around Bahia Blanca. Mr. 

 Cuming also met with Voluta Brasiliana, 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 Falkland Ids. and 27 to 

 Maldonado and Brazil. At JNIaldonado 37 species were found, 8 being 

 special, 10 common to K Patagonia, 2 to Rio, and 17 to Brazil. Of the 

 latter 8 range as far as the Antilles ; viz. : 

 Crepidula aculeata. Mactra fragilis. Modiola viator. 



protea. Venus flexuosa*. Plicatula Barbadensis. 



Pholas costata. Liicina semi-reticulata. 



At Bahia Blanca, in lat. 39° S., the most abundant shells observed by 

 Mr. Darwin (p. 243) were 



Oliva auricularia. Oliva. tehuelcbana. Voluta angulata. 



„ puelchana. Voluta Brasiliana. Terebra Patagonica. 



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



Octopus tehuelchus 



Columbella sertulariura. 



BuUia globulosa. 



Pleurotoma Patagonica. 



Pissurellidaea megatrema. 



Panopsea abbreviata. 



Periploma compressa. 



Lyonsia Patagonica. 



Solecurtus Platensis. 



XVII. Caribbean Province. 



The Gulf of Mexico, the West Indian Islands, and the eastern coast of 

 South America, as far as Eio, form the fourth great tropical region of marine 

 life. The number of shells is estimated by Prof. C. B. Adams at not less 

 than 1500 species. Of these 500 are described by M. D'Orbigny in Ramon 

 de la Sagra's History of Cuba, and a small number of the Brazilian species 

 in the same author's Travels in South America. 



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

 West Indian shell, which is the Venus punctifera of Gray. 



