REPORT ON THE PTEROPODA. 51 



the equator, but is rather localised and not very abundant, for no one has ever collected 

 numerous specimens of the different species just mentioned. 



In regard to two other species, " Clio" pyramiclalis, Quoy and Gaimard, 1 and " Clio" 

 austrcdis, Bruguiere, 2 they are very imperfectly known. 



The first was taken in the harbour of Amboina, and measured 10 mm. in length ; it 

 is represented as of so strange a shape, that the accuracy of the figure of Quoy and 

 Gaimard is a little doubtful. 



The second species is known only from an obscure description and more obscure 

 figure by Bruguiere, who says that it was abundant on the south coast of Madagascar. 

 Since the time of Bruguiere, some naturalists have made collections of the Mollusca of 

 that island, but no one has again found this species. I hope, however, that further 

 researches will be made, for it would be very interesting indeed to obtain this Pteropod, 

 because it would be the largest of all (according to Bruguiere, it measures 2 inches in 

 length), and it is said to have also three pairs of buccal cones, as in Clione limacina. 



The other species described under the name of Clione or Clio (after deducting the 

 Thecosomata which bear the latter name, and which most zoologists still call Cleoclora), 

 are, as we have already seen, synonymous with other forms previously known. 



Ross 3 recorded, under the name Clio borealis, a Gymnosomatous Pteropod obtained 

 between lat. 60° and 64° S., along with " Argonauta artica" (the latter is really a 

 Limacina, and was found by the Challenger). 4 According to Souleyet, 5 the naturalists 

 of the " Astrolabe " also found, during the last voyage, a Clione " among the ice of the 

 South Pole," which must certainly be the same species as the " Clio borealis " of Ross. 

 Unfortunately, in the zoological account of this voyage, there is no Pteropod mentioned, 

 and I do not know what became of the specimens of Clione noticed by Souleyet. 



However, if one may be allowed to make a hypothesis respecting these examples, it 

 seems to me rather probable that they are only Spongiobranchsea australis, a species 

 which is widely distributed throughout the cold Antarctic Seas, where it was previously 

 observed from long. 60° W. to long. 123° E. ; towards the ecpiator it scarcely passes 

 beyond the isothermal line of 50° F. (for August), and it has up to the present time 

 been collected as far as lat. 51° S. It is therefore a species belonging to the cold regions, 

 and I think it will be found to exist all around the South Pole, as Clione limacina does 

 around the North Pole. 



Bronn 6 mentions an Australian Clione, according to Lamartiniere. But the species 

 described by this last writer is a Clio (Thecosomatous Pteropod) known to zoologists 

 under the name of Clio (or Cleoclora) pyramidata. 



1 Voyage de decouvertes de 1' Astrolabe, Zoologie, t. ii. p. 371, pi. xsvii. fig. 37. 



2 Encyclopedie rnethodique, Vers, t. i. p. 507, pi. lxxv. figs. 1, 2. 



3 A Voyage of Discovery and Research in the Southern and Antarctic Regions, vol. i. p. 169, 1847. 



4 Station 153, lat. 65° 42' S., long. 79° 4C E. 5 Histoire naturelle des Mollusques Pteropodes, p. 86. 

 6 Die Klasaen und Ordnungen des Thierreichs, Bd. iii. p. 582. 



