193 



ornamented with very fine annular striae, and a few ridges of 

 growth. 



Apex unknown. 



Dimensions of the longest example. — Length, 92 (estimated 

 at 100) ; diameter of anterior aperture, 9 millimetres. 



Locality. — Upper beds at Muddy Creek. 



The costated portion differs from E. Mantelli in not having 

 the tessellated ornament ; it is similar to JE. brevifissum, 

 Deshayes, of the Paris basin, but the ribs are only about 15, and 

 to E. substriatum of the same author, but the apical part of that 

 shell is finely striated. 



Dentalium (?) triquetrum, spec. nov. Plate xx., fig. 3. 



Shell very attenuated, rather thick, very slightly curved ; ex- 

 tremely flattened laterally, so that the transverse section is an 

 isosceles triangle, the angle on the convex side more rounded 

 than those formed by the flattish concave face and the sides ; 

 the perpendicular from the convex side is a little longer than 

 the base. 



The surface is polished, ornamented by a few wavy undula- 

 tions and microscopic striae. 



Dimensions. — Longer diameter of aperture at each end in a 

 length of 10 millimetres, '75 and 5 millimetres respectively. 



Locality. — Grlauconitic sands, Adelaide bore. 



Dentalium lacteum, Deshayes. 



Beference.—Kon. Gen. Dentale, 1825, t. 16, f. 28. 



The Eev. J. E. Tenison- Woods (Proc. Roy. Soc, Tasm., for 

 1875, p. 17) identified a Table Cape fossil with the above- 

 named species living in the Indian Seas. I have not seen a 

 specimen from the Tasmanian locality, but a common shell in 

 the Muddy Creek beds agrees well with the figure, measure- 

 ments, and description given by Deshayes. The original diag- 

 nosis is as follows : — Round, not slit at the posterior extremity, 

 slightly arched, very smooth, very shining, subtranslucent ; 

 length, 30; diameter at aperture, 2*5 millimetres. 



Gadulus mucronatus, spec. nov. Plate xx., fig. 10.* 

 Long, narrow, slightly bent; slightly swollen at a little 

 nearer the anterior than the posterior end, more conspicuously 

 so on the convex curve, which is a little nearer to the posterior 

 end than is the bulging on the concave curve. Anterior to the 

 inflation the tube is slightly laterally compressed. The mouth 

 is slightly oblique, oval, with a thin and sharp edge ; the pos- 

 terior opening is round, thickened within, and bevelled to a 

 sharp edge, inconspicuously mucronately produced on the con- 



*A very imperfect representation of the shell. 



