296 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



The above facts may have given rise to the belief we have heard 

 expressed that intermediate forms linking the two species existed. 

 We have found none such, and where the shell is immature consider 

 the size of the nepionic shell and the number of riblets to 0-1 mm. 

 can be relied upon for purposes of discrimination. 



Whether or no the toothed form be, as Pilsbry considers, a variety 

 or subspecies of the Pwpa strobeli of Gredler (= P. rivierana, Benson) 

 or a distinct species we have not as yet had the opportunity of 

 determining. Since, however, as Pilsbry points out, in T. strobeli 

 the striae are more spaced, the last whorl flattened laterally toward 

 the base, and the palatal fold and parietal lamella are longer and 

 stronger, we consider it best to speak of the British shell as 

 T. hritannicu and so avoid possible subsequent confusion in the 

 matter of tracing distribution. This name cannot he held to clash 

 with the PujM hritunnica (= Azeca goodalli) of Kenyon {Mug. Nat. 

 Hist. Lond., i, 1829, p. 426). 



By way of conclusion it may not be without interest to add the 

 following notes concerning the past history of British Truncatellinae. 

 The first discover)'' of members of this genus in the British Islands 

 appears to have been made in 1813 by Dr. Chalmers, of Kirkcaldy, 

 who found them at Balmerino (misspelled by Gray and Brown as 

 Balmenna), Fifeshire, and sent them to Dr. Fleming. The latter in 

 1828 {Brit. Anim., p. 269) recorded them as a form of Pupa ohtusa, 

 Drap. Forbes, however, having seen cotypes, stated that they were 

 referable to the species which Gray placed as Vertigo cylindrica, Fer. 

 (Gray's ed. of Turton's Manual, 1840, p. 201). A single example was 

 next taken by Jeffreys on Durdham Downs, near Bristol, and placed 

 in his new genus Alcea under Ferussac's trivial name {Trans. Linn. 

 Soc, xvi, 1830, p. 359). Khind in 1836 {Excur. illust. Geol. and 

 Nat. Hist, envir. Edinh., 2nd ed., p. 141) recorded Pupa cylindrica 

 from Salisbury Crags, and this T. Scott {Scott. Nat., 1891, p. 52) 

 gave very good reasons for believing referred to Truncatellina, while 

 he himself possesses specimens from that locality. Gray in 1840 

 (loc. cit.) had already cited Pupa minutissima, Hartmann, as a 

 synonym, and this specific name adopted by Forbes and Hanley 

 {Brit. Moll., XV, p. 104, 1852) with generic changes has been generally 

 employed for what has hitherto been considered the single British 

 species. Lowe in 1852 {Ann. & Mag. Nat. Hist., ser. ii, vol. ix, 

 p. 275) established Truncatellina as a section oi Pupa for P. linearis, 

 Lowe, but subsequently in 1855 {Proc. Zool. Soc. Lond., 1854(-55), 

 p. 207) named P. minutissima, Hartmann, as the type ; a second 

 designation which, of course, cannot stand. The Truncatellina cited 

 by Scudder in his Nomenclator Zoologicus as of Orbigny proves to 

 be a misprint for Truncatulina, the well-known genus of Forami- 

 nifera, and does not therefore invalidate Lowe's name. 



