MOLLISCA FliOM EUiEJTV FATHOMS — HEDLKV. 29') 



which broaden to the periphery, narrow to the suture, and are 

 parted by deeply excavate interstices of corresponding breadth. 

 Aperture circular, its lip constituted by the final rib. Majoi* 

 diani., 2-25 ; minor diam., 165 mm. 



Am6ng described species the Californian V. anelhim, Moi'ch, 

 alone resembles this. Judging from the figure'' the American 

 species has finer closer ribs. 



Trivia avellanoides, ]\PCoy, sp. 

 (Plate Iv., figs. 17, 18). 



Cyprcta avellanoides, 'M'Coy, Ann. Mag. Nat. Hist. (3), xx., 1867, 

 p. 436. Id., Prod. Pal.Yict., dec. iii., 1876, p. 36, pis. xxviii., 

 xxix., f. 3. a-c. 



Trivia avellanoides, Harris, Cat. Tert. Moll. Brit. Mus., i., 1897, 

 p. 213. 



Two specimens, one perfect, the other broken, are the first of 

 this .species reported as recent. The perfect specimen, of which I 

 offer a figure, is 4 '5 mm. in length, has thirty-seven thread-like 

 riblets which are interrupted by a smooth, not excavate, dorsal 

 space. Its colour is white, the smooth dorsal area more opaque 

 than the rest. 



All authors who have dealt with the species comment on its 

 extreme variability. The recent example, though not typical, 

 certainly intergrades with a small delicately sculptured form of 

 the fossil. Mr. R. Etheridge, who kindly checked my comparison 

 of the " Miner " shell with a series of \^ictorian fossils concurred 

 in this determination. 



The species is embraced in a group distinguished by a thin 

 shell, wide aperture, and a narrow outer lip, for which Jousseaume 

 has pi'oposed" the name Triviella. Its members are distributed in 

 South Africa, Southern Australia and New Zealand. 



Tkophox stimuleus, sp. nov. 



(Plate Iv., fig. 19). 



Shell minute, thin, prickly, ovately-fusiform, angled at the 

 shoulder. Whorls five, two of which compose the glossy conical 

 protoconch. Colour white. Sculjiture : thin close laminate 

 varices, about twelve to a whorl, ascend the spire oblii^uely, pro 

 duced on the shoulder in a claw projecting to the suture, crumpled 



Trvon— Man. Concli.. viii., 1886, pi. 49, f. 34. 

 Jo'ussetnime— Bull. Soc. Zool. Fr., ix., 1884, p. 9'.^ 



