PATAGOIOAN PEOTINCE. 



83 



Natica limbata. 



Lamellaiia antarotioa. 



Littorina califrinosa. 



Cheinnitzia Americana. 

 *ScaKria brevis. 

 •^Trocliita pileolus. 



Ciepidula Patagonica. 



Trochus Patagouicua. 

 *I\Iargarita Malvinse. 

 *Scissurella conica. 

 *Fissurella radiosa. 



Puncturella ccnica. 



Nacella cj-mbularia. 

 "Patella deaurata. 



*Patella barbara. 



* „ zebrina. 

 Siphonaria lateralis. 

 Cliiton seti(j;er. 

 Doris Inteola. 

 iEoIis Patagonica. 



*Spongiobrancli8ea. 

 Spii-alis? cucuUata, 66' S. 



Terebratella crenulata. 



* ,, Magellanica, many 



varieties. 

 Waldheiniia dilatata. 

 Pecten Patagonicus. 



Pectcncomeu?, 



Mytilus Magellanicus. 

 *Modiolarca trapezina. 



Leda sii!cula*a. 

 *Cardita Tlicuarsii. 

 *Astaite longirostris. 

 *Venu3 exalbida. 

 *Cyamium antarcticum. 



Mactia edulis. 

 *Lyonsia Malvinensi3. 



Pandora cistiila. 



Saxicava antarc'ica. 



Octopus megalocyathus. 



XYI. Patagoniaj^" Peoytn'ce. 



From S. Catliarina, soiitli of tlie Tropic, to P. Melo. Th:8 

 coast-line has shifted considerably since the era of its present 

 fauna. M. D'Orbigny and Mr. Darmn observed banks of recent 

 shells, especially Potamoimja hihkita, in the valley of La Plata 

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

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

 miles inland. Of 79 shells obtained by M. D'Orbignj'' on the 

 coast of X. Patagonia, 51 "v^ere 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. 



JIactra fragilis. 

 Venus flexuosa.* 

 Lucina semi-reticulata. 



Modiola \-iator. 

 PUcatula Baibadensis. 



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

 observed by Mr. Darwin (p. 243) were 



Oliva auriculttria. Oliva tehuelchana. Voluta angulata, 



„ puelcliana. Voluta Brasiliana. Terebra Patagonica, 



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

 species : — 



.^olis. 



Paludestrina. 



Seal aria. 



Natica. 



Cliiton. 



Solen. 



Lutraria. 



Donacilla. 



Nucula. 



Octopus teliuelchus. 

 Cohimbella sertulariimi. 

 Bullia globulosa. 

 Pieurotoma Patagonica. 

 Fissurellidsea megatrema. 

 Panopaea abbreviata. 

 Periploma compressa. 

 Lyonsia Patagonica. 

 Solecurtus Platensis. 



Leda. 



Cyiherea. 



Petricola- 



Corbula. 



Pinna. 



Mylilus. 



Lithodomus. 



Pecten. 



Ostrea. 



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

 Indian shell, which is the Vem<s punctifera of Gray. 



