101 



to suture, the latter very deeply impressed so as to give the 

 whorls a roumlcd swollen aspect ; base ahuost fiat, aperture 

 pyrilbrm entire, 1 5tli length of shell; columella simple. 

 Long. 3, Lat. 1 mil. 



RisaoiNA vARiciFEKA. U.S. Shell minutc, smootli shining, 

 tumid, apex somewhat contracted, of two whorls, smooth, and 

 was previously whiter than the spire ; whorls G-7, flattened, 

 but rounded above, suture deeply impressed, aperture rounded, 

 much smaller than penultimate whorl, outer lip slightly pro- 

 duced, inner lip reflected over the base, generally a continuous 

 line of swollen conspicuous varices on the columella side of 

 the whole shell. Long. 3, Lat. scarcely one mill, but this is 

 the largest size. 



A form approaching somewhat the H. cosiuJata, Grat. of the 

 European tertiaries, but smaller and with a rounded con- 

 tracted aperture. The varices are not always visible. I 

 believe this form still exists in Tasmanian seas. 



EissoiNA JOHNSTONi. n.s. Shcll minute, rather broadly 

 pyramidal tun-etted, apex smooth, white, shining, of two 

 smooth turbinated whorls ; spire 2| length of aperture ; 

 whoi'ls 9-lC, sloping, I'ather convex, obtusely carinated in the 

 m'.ddle, more or less longitudinally plicate, with 6-12 ribs 

 (which are in some specimens very faint, and others almost 

 varicose) and spirally lirate with 6-8 valid lirse, which often 

 alternate in size ; suture well impressed ; aperture suborbicular 

 outer lip somewhat produced, thin ; column slightly twisted, 

 and everted below ; base concave and spirally lirate. Long. 

 31^, Lat. l),. 



Very common. In this species the ribs do not follow each 

 other in a regular series, but seem rather to alternate, those of 

 each succeeding whorl rising from the interstices between the 

 ribs of the ones below. It has no living representative in 

 Australia. Its Bittium-like form distinguishes it from any 

 other species known to me. 



TuRBONiLLA PAGODA, n.s Shell minute, nari'owly pyra- 

 midal, apex a swollen elongated hind of pullus of two smooth 

 whorls, sjiire flattened turrioulate, whorls 9, rising in stages or 

 slightly overlapping; ribs 12-16 rounded, raised, in a con- 

 tinuous sloping series, broader than the interstices ; no visible 

 transverse markings, base smooth, slightly convex, aperture 

 oblong, squared above, rounded below,' columella twisted. 

 Long. 4.'. Lat. 1 mil. 



In this genus determinate characters are not easily speci- 

 fied.^ The above fossil may, perhaps, bo best distinguished by 

 its size, sloping ribs, smooth base, twisted columella, and the 

 whorls rising in stages. 



TuEBONiLLA LiE^cosTATA. n.s. Shell elougatc, narrowly. 



