190 



The Scaphopods of the Older Tertiary of 

 Australia. 



By Professor Ralph Tate, F.G.S., F.L.S. 



[Kead October 5, 1886.] 



Ge:n t us Entalis. 

 synopsis of the species. 



Longitudinally ribbed and transversely striated. 



U. Mantelli. 

 Surface smooth or transversely striated. 



Dorsal slit short, triangular. E. sicbfissura. 



Dorsal slit linear, long. 



Shell curved, slender, smooth. JE. acriculum. 



Shell straight, with annular ridges. E. annulatum. 



Entalis Mantelli, Zittel. 



Dentalium sp., Mantell, Quart. Journ. Geol. Soc, vol. vi., 

 p. 331, t. 28, f. 15. 



Dentalium Mantelli, Zittel, Palaeontologie von Neu Seeland, 

 p. 45, t. 13, fig. 7, 1865 ; id., Hutton, Tertiary Fossils of KZ., 

 p. 4, 1873. 



Dentalium tenuis and D. irregularis, Hutton, op. cit. 



Shell from nearly straight to subarcuate, thick, round, 

 gradually tapering. Ornamented with a variable number of 

 longitudinal ribs (from about 20 to 50), which are angular pos- 

 teriorly, but become more numerous and usually rounded as 

 they approach the base, where they are almost obsolete ; the 

 ribs are for the most part of equal dimensions, but occasionally 

 they are alternately slightly broad and narrow ; the inter- 

 spaces are much narrower than the ribs, sometimes almost 

 linear. The whole surface crossed by annular threads and 

 slight grooves, coincident with the aperture, which produce 

 slight crenulations on the longitudinal ribs. Aperture cir- 

 cular, with a thin edge. Fissure very long and narrow. 



Dimensions of a moderately large example : — Length, 50 ; 

 diameter of aperture, 5 ; length of fissure, 5 millimetres ; but 

 attaining to a length of 70, with a breadth of aperture of 7 

 millimetres. 



Localities. — Very abundant at most of the localities — Gas- 

 tropod bed of the'Kiver Murray Cliffs near Morgan, in a well- 

 sinking at jSfine-mile Camp, near ^"or'-West Bend ; lower beds 

 at Muddy Creek ; in the calciferous sandstone at Corio Bay; in 

 the blue clays at Schnapper Point, Port Phillip ; in the Turri- 

 tella clays at Blanche Point, Aldinga Bay ; and in the glau- 

 conitic clayey sands in the Adelaide bore ; Table Cape (Tenison- 



