TRUNCATELLINA. 77 



Pupa battagliens'is DE GREG., Ann. de Geologie et de Pale- 

 ontologie, 32 li\T., 1907, p. 13, pi. 1, f. 30. 



11. TEUNCATELLINA RIVIERANA BRITTANICA u. subsp. PL 8, 

 figs. 13, 14. 



The minute shell is shortly, deeply rimate, imperforate, 

 cylindric in the last three whorls, those above forming an 

 obtuse dome ; cinnamon colored ; glossy ; evenly but not 

 sharply rib-striate, the riblets oblique, about 2 in 0.1 mm. on 

 the last whorl; first I 1 /, whorls smoothish, pale. The whorls 

 are strongly convex, the last not flattened laterally towards 

 the base, without any trace of a crest behind the lip. The 

 aperture is ovate. Peristome paler than the shell, well thick- 

 ened, but narrowly expanded. On the parietal wall there is 

 a short tooth, so deep within that it is not seen in a direct 

 face view. The columella has a strong but obtuse tooth, visible 

 in an oblique view in the aperture. In the palate an im- 

 mersed, rounded or oblong tubercle, visible in a direct front 

 view. 



Length 1.74, diam. 0.85 mm. ; 5y 2 whorls. Type. 



Length 1.65, diam. 0.83 mm. ; nearly 5!/o whorls. 



England: Portland, Dorset, with T. cylindrica (G. C. 

 Spence) ; type and paratypes no. 109423 A. N. S. P. 



It resembles T. rivierana of southern Europe, but in that 

 species the parietal lamella and the palatal fold are longer 

 and stronger and the striae more spaced. T. odo-ntostoma is, 

 according to Westerlund, a larger and relatively longer shell, 

 2 l / 3 mm. long, % mm. wide, with 6-7 whorls and a thin peri- 

 stome. If Westerlund 's account is correct, the position of the 

 palatal fold is different. Unfortunately, Westerlund 's form 

 has not been figured, and no other author has reviewed its 

 characters and dimensions. 



While it appears unlikely that this British form is without 

 a name, I cannot find any applicable to it. By formally de- 

 scribing the shell, the attention of British conchologists will 

 be called to it, and a more thorough investigation can be made 

 than is possible from this side of the Atlantic. Various early 

 Swiss species might be compared if anybody could tell what 

 their characters are. 



