1T2 MARINE PROVINCES. 



warm seas, here reappear, such as Trophon, Buccinum, Margarita, 

 Puiicturella, Buccinopsis, Aclmete, Astarte, Cyaninm, etc. 

 TJsnally, however, these are representative rather than identical 

 genera, the species of Troplion, for instance, constituting a 

 peculiar group, with species extending to New Zealand and Cape 

 of Good Hope, but differing from the typical Trophon of the 

 Arctic mollusca. 



Kersuelen's Islands have been recently visited by several 

 scientific expeditions and 58 species of mollusks collected, 13 of 

 which occur on the South American coast, 6 belong to the New 

 Zealand fauna, 4 are found at the Cape of Good Hope. Among 

 them is the genus Struthiolaria belonging to the Australo- 

 Zealandic province : the other genera are South American. 

 Chilon Bclknapi of the Pacific, Lassea rubra of European seas, 

 and Terehratulina septentrionalis of Boreal America also 

 reappear here. 



Some peculiar species, together with several stragglers from 

 other regions and faunas have been discovered at the islands of 

 Marion, Crozet and Prince Edward. 



Fischer surmises that there exists a circumpolar fauna in the 

 Antarctic as well as in the Arctic regions, and thinks the occur- 

 rence of a number of mollusks of the Magellanic province in the 

 south of the New Zealand Archipelago and at the Cape of 

 Good Hope indicates that such is the fact. 



XVI. Patagonian Province. 



From S. Catharina, Brazil, south of the Tropic, to P. Melo, 

 Patagonia. This coast-line has shifted considerably since the 

 era of its present fauna. M. d'Orbigny and Mr. Darwin observed 

 banks of recent shells, especiallj^ Potamomya labiata, in the valley 

 of La Plata and the Pampas around Bahia Blanca. Mr. Cuming 

 also met with Voliita Brasiliana, and other existing 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 Islands, and 27 to Maldonado and Brazil. At Maldo- 

 nado 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. Mactra fragilis. Lucina semi-reticulata. 

 " protea. Yenus fiexuosa. Plicatula Barbadensis. 



Pholas costata. Modiola viator. 



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

 observed by Mr. Darwin (p. 243) were : — 



Oliva auricularia. Oliva tehuelchana. Voluta angulata. 

 " puelchaua. Voluta Brasiliana, . Terebra Patagonica. 



