266 
grooves, not at all oblique or very slightly so, equally strong at 
the anterior as at the posterior extremity, but on the other hand 
the fossil is, so far as known, only about half the length of the 
living species. I am afraid comparison of actual spezimens can only 
decide if there be differences in the number of the annulations 
for equal units of length, as the figures and description by 
Watson do not afford a sufficiency of detail on this head. Never- 
theless, it is stated that the flat bands are of variable widths, 
and increase with the growth of the shell from about 0-011 inch 
to twice that amount, a description that does not apply to the 
fossil ; and, moreover, the test is so thick that translucency can 
hardly have belonged to it. 
SEcTION GADILINA, Forresti, 1895. 
Apex entire, shell subtriangular in section. 
D. Tatei, Sharp and Pilsbry, 3, p. 218 (nom. mutand.). 
D. triquetrum, Tate, 1, p. 193; non Brocchi, 1814. 
EocENE.—ADELAIDE-BORE. 
FAMILY SIPHODENTALIIDA. 
Genus CapuLus, Philippi, 1844. 
C. mucronatus, Tate, 1, p. 193; id., Harris, 2, p. 297. 
Kocene.—Muppy Creek (Victoria). 
Post-EocEenEe.—Spring Creek (Victoria). 
Section GapiILa, Gray, 1847. 
C. acuminatus, Tate, 1, p. ae id., Pilsbry, 3, p. 183, t. 32, figs. 
47-49. 
MiocEenEe.—Aldinga Bay (S. Aust.) 
REcENT.—SoutTH AuvstTRALIA and N. 8. Wales. 
Mr. Pilsbry, op. cit., very justly remarks that the species name 
is inappropriate, though it is appropriate as applied to the perfect 
shell. It happens that the apical half or so is deciduous, and 
certainly the decollated portion, which is the part generally 
known, cannot be called acuminate. As regards this interesting 
phase of the Cadulus-shell, I leave to Dr. Verco to make more 
fully known, as the material in his possession is more thoroughly 
illustrative than what I possess. 
However, I borrowed the name after Deshayes, who, on the 
authority of Angas, had so attached his MS. name to New South 
Wales specimens in the British Museum, and Angas so listed the 
species for South Australia on the testimony of examples for- 
warded by me. (Proc. Zool. Soc., 1878, p. 868). 
C. infans, spec. nov. PI. viii., fig. 11. 
Similar to C. acwminatus (PI. viii., fig. 12), though words can hardly 
convey those differences which the eye can appreciate. The shell 
