eo 
‘“ 
= ie. 
178 RALPH TATE. 
aperture 7mm. The ratio of these measures are approximately 
the same in D. Provist and D. melanoides, being for the former 
100; 30°4; 32:6; 15; for the latter 100; 33:3; 33-3; 14-2, 
Localities :—Miocene—Hallett’s Cove, St. Vincent Gulf; Older 
Pliocene—Dry Creek bore near Adelaide (very abundant). 
Named in compliment to Mr. Provis, the late Manager of the 
Dry Creek Smelting Works, to whom the writer is indebted for 
the extensive collection of fossils obtained from the bore-holes at 
that place. 
Subgenus Semivertaqus. 
This name was established by Cossmann in 1889 (Annales de la 
Soc. Roy. Malac. de Belgique, Vol. xxiv., p. 28), for such species 
of Cerithiide resembling Vertagus, but which are distinguished by 
the absence of a plication on the columella, and by having a short 
canal ; he includes in it six species from the Eocene of Paris. No 
species has as yet been met with by me from our Eocene beds, but 
the genus is represented by one species each in the Miocene and 
Older Pliocene strata in the neighbourhood of Adelaide. Both agree 
with the type species, C. unisulcatum, Lamk., from comparison of 
actual specimens, in the general outline and apertural characters, 
put their spires taper more rapidly, the body-whorls are rather 
more conspicuously contracted, and the sutures well-defined. 
SEMIVERTAGUS SUBCALVATUS, spec. nov., Pl. x1., fig. 3. 
Shell pyramidally turreted, apex somewhat acuminate ; whorls 
thirteen, slightly flatly rounded at the posterior suture, incon- 
spicuously ornamented by seven spiral threads, with two to four 
threadlets in the interspaces. Length 21, breadth 6 mm. 
Locality:—Miocene: Calciferous sandstones, Aldinga Cliffs. 
SEMIVERTAGUS CAPILLATUS, spec. nov., Pl. xi., fig. 1. ,; j 
Shell pyramidally turreted, apex somewhat acuminate; whorls ; 
twelve, separated by a conspicuous suture; ornamented by twenty 
‘or more spiral graved lines, separated by wider intervals which 
increase in width towards the anterior suture, crossed by slightly 
