67 



to me to como very near to Astele, but the form is more 

 turbinate. 



GiBBULA, Risso, 1826 (Hist. Nat., vol. iv., p. 136.) The 

 species are numerous, and are found, says Messrs. Adams, in 

 every part of the world. The gibbosity of the whorls, the 

 perforated axis, and simple terminatiou of the columella 

 characterise the genus. 



MiNOLiA, A. Adams, 1860 (Annals of Nat. Hist., vol. 6, 

 3 ser., p. 336, November, 1860.) As this genus is little 

 known I append the definition and remarks. Shell globosely 

 conoidal, widely and deeply umbilicate, whorls rounded 

 latticed, suture channelled, last whorl almost detached, 

 aperture entire, lip thin, acute. Minolia is very like Torinia 

 in form and sculpture, but the aperture is pearly within. 

 It also resembles in form some southern species of Margarita, 

 but the texture marking and sculpture of the shell are 

 different. In sculpture it also resembles the species of 

 Euchelus, especially the sub-genus Perrinia, which was 

 dredged from deep water in the same locality. The shell 

 was named from the little island of Mino-sima,'^r]ear Niphon, 

 in the Japanese Archipelago, off which it was obtained. 

 This genus is another modification of the hollow spiral cone 

 of the trochoid family. The whorls are somewhat loosely 

 rolled upon themselves, which causes the sutures to be very 

 deep, and the last whorl to be almost disunited at the 

 peritreme. Half a dozen species are known in Australian 

 waters, but it seems very difficult to separate them from 

 Cyclostrema. 



Sub-family, Stomaiellince. Foot very thick and fleshy, 

 developed posteriorly ; operculum wanting, or thin, homy, 

 ovate, of few rapidly increasing whorls; shell more or less 

 ear-shaped, of few whorls ; aperture very wide. 



Stomatella, Lamarck, 1809, Phil. Zool. This genus is 

 distinguished by the possession of an operculum, with an 

 orbicular shell spirally grooved ; spire conical ; whorls 

 round. 



Gena, Gray, 1840 (Synop. Brit. Mus.) This is distin- 

 guished from the preceding by the oblong elongate form, 

 ear-shaped sub-spiral aperture longer than wide, spire 

 obsolete, surface coloured, aud granular. The radula of 

 Gena is linear, transparent, rather dilated in front. Teeth, 

 00.5.1.5.00, in rather an arched series ; central narrow 

 elongate, contracted very narrow in upper j^art ; apex 

 small, triangular, reflexed denticulate on the edge ; inner 



F 



