ABIDA. 267 



in Algeria, reported by Bourguignat (Malacologie de I'Al- 

 gerie), is really remarkable. The records are so definite that 

 one may scarcely express doubt, whatever may be felt; yet 

 further confirmation would certainly be comforting. Chon- 

 drina gcmiostoma, C. penchinatiana and C. avenacea are other 

 equally anomalous records from Bourguignat and from Le- 

 tourneux (La I&bylie, i, p. 227). Except C. avenacea, these 

 species belong to the Pyrenean center, most of them being 

 distinctively mountain forms. Until these Algerian records 

 shall be confirmed in the field, speculation upon them is un- 

 profitable. 



It will be noted that the area of Chondrina extends both 

 east and west of that of Abida, also being found further south 

 (in Sicily and Morocco), and further north (Oeland and Got- 

 land. Except in England, the area of Abida is everywhere 

 surpassed by Chondrina. Since there is also much more struc- 

 tural diversity among the Chondrinas, there is some reason to 

 believe it older as a genus; though of course the specialized 

 radula forbids the idea that it was ancestral to Abida. 



Nomenclature. 



The generic term Pupa was first used by Bolten in the post- 

 humous Museum Boltenianum, 1798, p. 110, for Pupa solidula 

 (n. n. for Voluta flammea Gmel.) and Pupa grisebla (n. n. 

 for Voluta solidula Gmel.). The second of these species, P. 

 grisebla, may be selected as type of Pupa. That term there- 

 fore displaces the names of the Tectibranch genus Solidula F. 

 de W. (see Man. Conch., 1st ser., xv, p. 136), which will be 

 known as Pupa Bolt. 



Lamarck, in Syst. Anim. sans Vert., 1801, p. 88, proposed 

 to use Pupa for a series of land shells, giving P. uva as an ex- 

 ample. Pupa Lam., with the type uva, becomes therefore a 

 synonym of Cerion Bolt.,* 1798 (Mus. Bolt., p. 90; Man. 

 Conch., 2d ser., xiv, 174) . 



* Cferton contained the following Boltenian species: 



C. vulgar Bolt., based on figures of C. mumia and C. uva ; here restricted 

 to the latter. 



C. uva Bolt, based on Gmelin, together with figures possibly of C. multi- 

 costa K. 



