A/rtCiiH yon-marine MoIIusca. 501 



Judging from the figures, it slioukl also include G. brevis 

 (Tliielc) and caren, iridescens, and mulasanyiensis (Preston), 

 wliile G. caroli (Kob.) is descriljcd as possessing a double 

 tooth on the U|)i)er portion of the cohunella, although there 

 is no sign of this feature in the figure of the shell. 



Gulella {Molorcl/a) r/irnidolina; srissidcns, subsp. n. 

 (IM.'XIV. Hg. 27.) 



The typical form of G.ywendolina contains about 6 whorls, 

 is perfectly smooth, with simple, shallow suture, :ind measures 

 from 5 to 5^ by 1^ mm. 'I'he dentition consists of an 

 angular parietal lamella ; 2 separate, nearly equal, single 

 teeth on the outer lip, corresponding to a single external 

 cavity ; a mid-basal denticle, and a large molar tooth, with 

 two well-defined cusps, on the columella. It is known from 

 the Shimbi Hills and Gazi, Kenya Colony. 



G. (/wejuloliiue scisaidens also contains 5^ whorls, but is 

 somewhat smaller than type ; it is similar in sculpture, 

 suture, parietal lamella, and mid-basal denticle, but differs 

 very noticeably in the columellar molar, which is split to its 

 base, while on the outer lip is a large pointed upper tooth, 

 bearing a minute second cusp on its upper surface, and a 

 smaller, more deep-set lower tooth at the right extremity of 

 the base. 



Long. 4"1, lat. TO; last whorl 2"0 mm. 



Hob. Tanganyika, Dar-es-salaam (Connolly). 



The single example taken differs so considerably from 

 typical ytvendolitKe, btjth in size and dentition, that it will be 

 fully entitled to rank as a distinct species if the variation 

 proves to be constant. The localities, however, are not very 

 remote, and 1 should not be surprised if further search along 

 the coast were to produce intermediates, linking the two 

 forms. 



Genus Stkeptostele, Dohrn, 1860. 

 In 1919 Pilsbry gave a list of 30 species known to him as 

 belonging to the genus Streptostele. In addition to these, 

 1 have satisfied myself, from examination of the shells them- 

 selves or the literature concerning them, that the following 

 species, hitherto attributed to other genera, should be placed 

 in that genus : — 



Ojjtus terebra and cicinn, Preston. 

 O. lenta and venvsta, Smith. 



O. bawriense, Pilsbry { = Sienoyyra li/ciilu, (Jibbons). 

 O. vieirai, Nobre. 

 Ann. tC- May. A'. Hist. Ser. 'J. Vol. x. 34 



