PATAGONIAN mOVINCE. 



83 



Natica limbata. 



Lamellaria antarctica. 



Littorina culiginosa. 



Chemnitzia Americaua. 

 *Scalaria brevis. 

 *Trochita pileolus. 



Ciepidula Patagoiiica. 



Trochus Patagonicus. 

 *Margarita Malviiiee. 

 *Scissurella conica. 

 *Fissurella radio? a. 



Puncturella conica. 



Nacella cjnnbulai'ia. 

 *Pate!la deaurata. 



*PatelIa barbara. 



* „ zebriiia. 

 Siphonaria lateralis. 

 Chiton setiger. 

 Doris luteola. 

 iEolis Patagonica. 



*Spongiobrancli£ea. 

 Spii'ali3? cucullata, 66* S. 



Terebratella crenulata. 



* „ Magellanica, many 



varieties. 

 Waldheimia dilatata. 

 Pecten Patagonicus. 



Pect( n Cornells, 



Mytilus Magellanicus. 

 *Modiolarca trapezina. 



Leda sulculata. 

 *Cardita Thouarsii. 

 *Astarte longirostris. 

 *Venu3 exalbida. 

 *Cyamiuna antarcticuin. 



Mactia edulis. 

 *Lyonsia Malvinensis. 



Pandora cistula. 



Saxicava antarctica. 



Octopus megalocyathus. 



XVI. Patagoxiajn" Province. 



From S. 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 lahiata, 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 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 Maldonada 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 Barbadensis. 



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 Brasiliana. Terebra Patagonica. 



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

 species : — 



Octopus tehuelchus. 

 Colurabella sertularium. 

 Bullia globulosa. 

 Pleurotoma Patagonica. 

 Fissurellideea megatrema. 

 Panopsea abbreviata. 

 Periploma compressa. 

 Lyonsia Patagonica. 

 Solecurtus Platensis. 



.^olis. 



Paludestrina. 



Scalaria. 



Natica. 



Chiton, 



Solen. 



Lutraria. 



Donacilla. 



Nucula, 



Leda. 



Cjnherea. 



Petricola. 



Corbula. 



Pinna. 



Mytilus, 



Lithodomus. 



Pecten. 



Ostrea, 



* The variety of Venus Jlexuo^a found at Rio can be distinguished from the West 

 Indian shell, which is the Venus punctif era of Gray, 



