194 



vex side corresponding with a faint internal rib, and slightly- 

 insinuated laterally. Surface smooth, polished, microscopically 

 concentrically and with faint indications of opaque transverse 

 bands. 



Dimensions. — Length, 7; diameter at swelling, 1*25 ; of 

 mouth, '9 millimetres. 



Locality. — Not uncommon in the lower beds at Muddy 

 Creek. 



The outline of the shell is like that of C. gracilis, Jeffreys, 

 but the shell is very much larger, and is otherwise very 

 different. 



Cadulus acuminatus. 



Slightly curved, tapering at both ends, enlarging more 

 rapidly posteriorly than anteriorly, but not at all bulging ; 

 surface smooth and shining ; microscopically concentrically 

 striated. Mouth circular, slightly oblique, thin ; posterior 

 opening circular, small, the edge thick, 



Dimensions. — Length, 6 ; diameter at the middle, 1 ; of 

 mouth, "75 millimetres. 



Locality. — Oyster beds of the Upper Aldinga series. 



The species is not uncommon in shell sand on the shores of 

 St. Vincent Gulf. 



The Pteropods of the Older Tertiary of 

 Australia. 



By Professor Balph Tate, F.G.S., F.L.S., &c. 



[Read October 5, 1886.] 



Genus Sttliola. 

 synopsis of the species. 

 "Without conspicuous ornament. 



Sides rounded ; a dorsal furrow. ti. Bangiana. 



Sides angulated ; no dorsal furrow. S. bicarinata. 



Transversely annulated. S. annulata. 



Styliola Rangiana, spec. nov. Plate xx., fig. 2. 

 Shell slender, conical, pellucid ; straightish, but slightly 

 curved apically, and rather abruptly tapering to a fine point ; 

 in front of the apex are one or two small inflations ; slightly 

 compressed dorso-ventrally ; ornamented with obliquely trans- 

 verse striae. A longitudinal sulcus extends from the aperture 



