265 



Deshayes {op. supra cit.) mentions AmpulUna as having been 

 suggested by Lamarck, but never published by him ; also, that the 

 latter had subsequently abandoned the terra. But Deshayes does 

 not quote any species illustrating Lamarck's proposal, and we are 

 thus left in doubt as to what AmpuUina really was. 



In 1822 Eowdich' divided Ampullaria into two parts, one of 

 ■which he (jailed AmpulUna. He gives a figure as representing it," 

 but neither in the text nor in the explanation of the plate does he 

 mention a single species in connection with it, and AmpulUna is 

 not there diagnosed nor established. 



In 1830 Blainville {op. supra cit.) used the term AmpulUna in 

 another connection, so that after that date it was not available for 

 the molluscs indicated by Deshayes and as exemplified by Natica 

 sigaretina. 



In 1837 Desor and Agassiz {op. supra cit.) suggested the term 

 Euspira, comprising in it such species as Natica glaucinoides, 

 Sowerby {nan Deshayes), iV^. depressa, Sowerby, Ampullaria patula, 

 Lamarck, A. acuta, Lamarck, A. sigaretina, Lamarck, A. ambula- 

 crum, Sowerby, etc., etc. French authors ' have interpreted 

 Euspira through the medium of E. canaliculata, Morris and 

 Lycett.* That species cannot possibly be regarded as the type of 

 the genus, however, as it was not mentioned by Desor and 

 Agassiz when they founded Euspira — the species was not even 

 denominated at that period. Euspira as delimited by the last- 

 mentioned authors includes species of Natica ; to prevent miscon- 

 ception the following well-known species is here selected as the 

 type, from amongst those mentioned by the authors of the genus. 



Tgpe. — Ampullaria sigaretina, Lamarck. 



Subgenus AMPULLOSPIRA, nom. mut. 



Euspira, Cossmann, etc. (wow Desor and Agassiz). 



Distinguished by its much elevated and canaliculate spire ; 

 columellar border thick, in part covering the umbilicus, which 

 has no limb. 



' Elements of Conchology, pt. i. Univalves, 1822, p. 31. 



* Bowdich, op. cit. pi. ix. fig. 2. 



' E.g. Cossmann, Ann. Soc. Roy. Malac. Belg. t. xxiii. 1888, p. 175. 



* Moll. Great Oolite (Pal. Soc), pt. i. 1850, p. 45. 



