LINNEAN SPECIES OF BRITISH NON-MARINE MOLLUSCA. 209 



lieu of Muller's better-known one. It is of interest at the same time to note 

 that Beck (Index Moll. 1837, p. 14) queries under his Theba leucas " an 

 H. pisana, Ehrbg. ? Sav. Egpt. m. ii. 15-16?" The figures thus indicated 

 are undoubted H. pisana, Miill., whose species, however, follows next as a 

 distinct one in Beck's list. 



Helix octona. 



Miiller (Verm. Hist. ii. p. 150) makes this a synonym of. his Buccinum 

 acicula regardless of the fact that Linne described the species as having 

 " apertura subrotunda," whilst of his own he states " apertura oblonga seu 

 fusif ormis.'' 



Nilsson (Hist. Moll. Svec. 1822, p. 92) calls it a Paludina, and says it is 

 not dissimilar from Draparnaud's Cyclostoma acutum. Hanley (p. 381) 

 agrees with this conclusion. The cited figure (Gualtieri, pi. vi. f. BB), 

 however, suggests the fry of Limncea glabra (Mull.) with which it has been 

 identified by both Pennant (Brit. Zool. iv. Svo. ed. p. 138, with a ?) and 

 Fleming (Hist. Brit. Anim. p. 271). Pulteney included it in his "Cata- 

 logues," but Rackett in the later edition eliminates it on the ground that it 

 is not English. 



Linne's name, therefore, cannot well be connected with any of our known 

 species and must remain in abeyance. 



Helix subcylindrica. 



This also was included by Pulteney in his " Catalogues," but rejected by 

 Rackett as " not of English growth." Dillwyn (Cat. ii. p. 952) and Moquin- 

 Tandon (Hist. Moll. France, ii. p. 301) identify this with Muller's H. lubrica, 

 although the habitat is given by Linne as " in aquis dulcibus Europte 

 borealis." Hanley (p. 379) gives as his opinion that only Truncatella 

 Montagui of Lowe [ = T. truncata, Mont.] agrees with the description of the 

 shell, forgetting that Truncatella is a southern not a northern form. 



Possibly Linne's shell was the fry of some freshwater form. Anyhow the 

 name will have, we consider, to be left out of account. 



Pupilla (Turbo, L.) muscorum (1). 



The identification of this species rests mainly on tradition, Draparnaud 

 alone having applied the name to a different form from that which generally 

 bears it. 



There is an example, noted by Hanley, of an edentulous specimen in the 

 Linnean collection that alone accords as he says with the description, but 

 this is in packet " N. 44 " of those we now believe to be of Muller's sending. 

 Miiller be it noted (Verm. Hist. ii. p. 105) also describes the species, which 

 he puts under Helix, as " Apertura edentula," and the name can, we think, 

 be accepted on Muller's confirmation. 



