Cyclostrema, Adeorhis, Vitrinella, aiid related genera. 115 



Granigyra Dall, 1889. Type, G. limata Dall. Off Cuba, 310 fathoms. 



" Shell covered with small pustules or granules like those on 

 Poromya or Plectodon." 



" This singular little shell is a typical Cyclostrema (i. e. Lissospira^) 

 in its conchological features, except for its granular surface. The 

 latter recalls that of Poromya, but is finer and less regular." Bull. 

 Mus. Comp. Zool., xviii, p. 395, 1889. 



Specimens of G. limata Dall and G. spinulosa Bush in Professor 

 Yerrill's collection have a small umbilicus or perforation; the aper- 

 ture nearly circular, with a slight sutural angle, and the pei'itreme 

 simple, entire, and but slightly attached to the body- whorl, so that 

 the section will come under the new genus Lissospira, until some 

 knowledge of the operculum and animal can be obtained, Avhich may 

 give it generic distinction. 



There is a group of small, white, solid, nearly smooth, porcella- 

 nous shells which have been referred to Ethalia (since 1855-7), 

 Teinostoma, Pseudorotella, Calceolina, Girsonella, and Dillwynella. 

 They have several features in common, agreeing especially in hav- 

 ing the umbilical region wholly, or in part, covered with a callous 

 deposit. It therefore seems probable that they may, upon further 

 examination, prove to be closely related to each other. Their family 

 relations, however, will be difficult to determine, as the operculum 

 and animal even of most of the type species are unknown. The 

 solid porcellanous character of the shells together with the callosity 

 covering the umbilicus would indicate closer affinity to the genus 

 Umhoniuni Link, 1807 (type, M. vestiariuni (Linne), sub-family 

 Umbouiinte, H. and A. Adams), rather than to the thinner, more 

 delicate, mostly semi-transparent species referred to the several 

 genera belonging to the Vitrinellidfe. 



Therefore, instead of placing the above genera chronologically 

 with those already considered, I have, for convenience, grouped them 

 as follows : 



' Heliciella Costa, 1861, non Eelicella Ferussac, 1819 (1821?) nee Helicelk Lam., 

 1812. 



I have been unable to consult the original description of this genus, and therefore 

 do not know whether it bears any relation to Lissospira or not. Tryon (Manual, x, p. 

 9G) made Helicella {Helicidla index) mutabilis Costa a synonym of Cyclostrema Cxdler- 

 iana Clark; (ix, p. 296) he mentioned Heliciella as equal to Megalomphalus Brusina, 

 1871, in part, but did not quote either the description or type. 



