228 



Species named after Mr. E. M. Jolinston, its discoverer and 

 author of many papers on the Tertiary Geology of Tasmania. 



Shell acuminate, thin, smooth, and shining ; whorls 12, nearly 

 flat, suture distinct; spire sharply acuminate; aperture 

 elongately-ovate, slightly effuse in front ; outer lip acute and 

 simple ; columella callous and slightly twisted. 



Length, 9*0 ; hreadth, 1"5 millimetres. 



Localities. — Table Cape. E. M. Johnston. Eiver Murray 

 Cliffs, near Morgan, S. Aust. ; Muddy Creek, Victoria. E. 

 Tate. 



This species has been confounded by the Eev. J. Tenison- 

 Woods with the recent L. suhulata of Western Europe, from 

 which it differs in shape and suture ; but it has a nearer 

 relative in L. acutissima, Sowerby, living off the coasts of 

 Eastern and South-Eastern Australia. It differs from that 

 species by its smaller size and slender proportions. L. 

 acutissima with 12 whorls has a length of 15-5 mm. by a 

 breadth of 3 mm.; whilst L. Johnstoniana with 12 whorls has 

 a length of 9*0 mm. by a breadth of 1'5 mm. 



Ctlichna Woodsii. 



8i/n. — C. arachis. Tenison- Woods {non Quoy). 



Shell solid, elongately ovate, imperforate ; regularly spirally 

 sulcated, the intervening ridges flat and much broader, trans- 

 versely ornamented with very fine close-set lines, which give 

 the appearance of punctures within the sulci. Apex per- 

 forated ; aperture narrow above, wider in front ; outer lip 

 thin, simple ; columella thick, slightly expanded, a little 

 twisted and abruptly truncate in front. 



Length, 13 "5 ; breadth, 5*5 millimetres. 



The above definition is drawn from a Table Cape specimen 

 identical with that which Tenison- Woods referred to the 

 living species C. arachis of Quoy. O. Woodsii differs, however, 

 in its more ovate outline, in its aperture and ornament, and in 

 its truncated columella. The material at my command is not 

 sufficient to warrant its generic separation which is suggested 

 by the truncated columella. 



CHAMOSTEEi. CEASSl.. 



Left valve rhomboidal, somewhat convex, very thick ; pallial 

 line and margins of adductor impressions crenulated, not 

 striated, as in O. alhida. Attached valve unknown. 



Diameters. — 40 and 36 millimetres. 



Locality. — Table Cape. E. M. Johnston {two examples). 



This determination adds to the Australian tertiary fauna, a 

 genus hitherto only known by one species (C. alhida) inhabit- 

 ing the seas of Southern and Eastern Australia. Comparing 

 samples of equal size of the two species, the fossil is dis- 



