CADULUS-GADILA. 183 



Cadulus simillimus Wats., Jonru. Linn. Soc, xiv., p. 526 (1879) ; 

 Chall. Rep., p. 20, pi. 3, f. 6 (1885). 



This differs from C. gracilis Jeffreys in being broader, with a 

 slight bulge on the concave curve, in being a little more bent, and 

 in not being compressed ; it is also larger. It is extremely like C. 

 jeffreysi Monter., but is a little more bent, especially in front, is 

 larger, and seems a thinner shell. {Watson). 



C. ACUMINATUS Tate. PL 32, figs. 47, 48, 49. 



Shell quite thin, moderately arcuate and not much swollen, fusi- 

 form, the greatest girth about median, thence very gradually taper- 

 ing toward the ends, which are rather large ; the median bulging 

 being about as obvious in a dorsal or ventral (fig. 48) as in a lateral 

 view of the shell. Tube somewhat flattened antero-posteriorly through- 

 out, the compression slightly greater at the ends. Surface appear- 

 ing perfectly smooth and glossy ; translu ceiit-wh'itish. throughout, 

 except for an opaque white ring around the tube a short distance from 

 the smaller end, produced by a narrow internal callous ledge. Both 

 openings oval, their outlines more flattened on the convex than on 

 the other side, and both cut the tube nearly at right angles; and 

 the peristomes are simple. Greatest diameter of apex about two- 

 thirds that of the aperture. 



Length 6-4; tube measuring Til by 1-25 mill, at point of great- 

 est diameter ; aperture 0705 by 0-9 mill. ; apex 0564 by 0-66 mill- 

 (figs. 48, 49). 



Another specimen (fig. 47) measures: Length 5'2 mill.; antero- 

 posterior diam. at greatest amplitude 0-9, at aperture 06, at apex 

 0-47 mill. 



St. Vincent Gulf, South Australia (Tate, Bednall) ; Port Stephens, 

 New Soidh Wales (Dr. J. C. Cox). 



Cadulus acuminatus Tate, Proc. and Rep. Roy. Soc. S. Australia, 

 ix, p. 193 (1887).— C. acuminatus Desh. MS. in Coll. Cuming, 

 Angas, P. Z. S., 1878, p.S68. 



The specific name is singularly inappropriate. Professor Tate de- 

 scribed it from the oyster beds of the Upper Aldinga series (Plio- 

 cene). 



Numerous specimens vary between the more obese and the slen- 

 der specimens figured. The white girdle near the smaller end is 

 constantly conspicuous on the milky translucent color of the rest of 

 the shell. This girdle is removed from the apex a distance about 



