114 K. J. Bush — Marine Gastropods referred to 



Ganesa Jeffreys, 1883. Type, G. nitidiuscida Jeffreys, Off the Hebrides. 570 

 fathoms. 



" Shell shaped like a JSfatica, thin, peristome continuous, free and 

 separate in the young, but united to the periphery in the adult, spire 

 having an oblique axis ; base perforated, not umbilicate ; operculum 

 horny, multispiral." 



" Differs from Tha7'sis in the obliquity of the sjiire and perforation 

 of the base at every stage of growth." P. Z. S., p. 94, March, 1883. 



Two very distinct forms were described and figured under this 

 genus, neither of which were mentioned as the type. G. pruinosa^ 

 in general appearance, shape of aperture, and peritrerae, agrees closely 

 with Cyclostre^na (i. e. Lissosp>ira) offine, and differs chiefly in hav- 

 ing a peculiar granular surface. Several species having the same 

 peculiarity have more recently been dredged by the XT. S. F. C. at con- 

 siderable depths in southern waters, for which group Mr. Dall consti- 

 tuted the section Granigyra. 



Therefore as the other species, G. nitidluscula .Jeffreys, will stand 

 for the type of the genus, it will be necessary to make some changes 

 in its definition. 



G. nitidluscula Jeffreys. 



" Shell differs from G. pruinosa in being exactly globular, opaque, 

 and glossy ; the sculpture consists of flexuous but slight and remote 

 raised strije in the (direction of the) lines of growth ; the last or 

 body-whorl is not so disproportionately large ; the apex of the spire 

 is depressed ; the mouth is angulated both above and below, and the 

 umbilical chink is channelled. L. 125, B. 125." P. Z. S., p. 94, pi. 

 xix, figs. 9-9a, Mar., 1883. 



Ganesa Jeffreys, 1883 (sens, restr.) 



Shell resembling a Lissospira in general appearance, but differing 

 in having the aperture modified by the body-whorl and angulated 

 both above and below, and also in having the umbilical chink chan- 

 neled and partly concealed by the columellar margin. 



Operculum and animal unknown. 



Fischer placed this genus as a subgenus of his Cyclostrema, but 

 cited G. 2^ruinosa for an example. 



Until the odontophore is known, I consider it but a subgenus of 

 Lissospira, for the reception of species which, like Lissospira Lalli, 

 have the umbilical chink bordered along its outer margin by a raised 

 rounded thread so that it appears channeled, and is nearly concealed 

 by the more or less flattening and spreading out of the columellar 

 margin of the peritreme. See also Cirsonella An gas, p. 120. 



