102 
a prom Tasmaniea, rom. mutand 
N. parva, var. Tasmanica, Pilsbry, “ en, 1895. 
Frederick Fury Bay, Tasmania (W. L. May). 
Cadulus (Gadilia) spretus, spee. 
Shell small, of medium proportion, well-curved, rigat (im 
some specimens) with translucent and opaque-white rings and 
encircling bands. Surface smooth, with ana obliquely annular 
grooves or lines, without traces of vertical s 
Apertures circular, transverse. cong bddanly contracted 
quite near the oral aperture, but exhibits a slight dilatation at 
he end. 
Shell most like C. panamensis, Sharp and Pilsbry, but seems to 
grow more rapidly, has greater breadth throughout, and is more 
d 
h of shell, 5:5 ; diameter of larger aperture, ^7 ; of the 
smaller aperture, ‘3 mm. 
rt Esperance, Tasmania, in 24 fathoms ( W. L. May). 
Cyamium mactroides, spec. nov. 
Shell mactra-like, minute, equivalve, nearly equilateral, some- 
what thick, smooth, and shining; of a whitish colour, and par 
tially brown-tinted, moderately convex. Pa ebisie concentrically 
striated, en radially ise ventral and anterior margins 
crenulated w Umbos small, approximate, slightly directed 
forwards, a liste posterior. e line about equally inclined, 
the anterior margin curved, the posterior margin truncatedly 
rounded, ventral margin nearly straig 
e arched and relatively "deep. Left valve with a 
posterior marginal ligamentel pit, in front of which is a central 
cardinal tooth with two strong equal divaricating branches, and 
an anterior oblique cardinal tooth. Right valve with two 
diverging cardinal teeth, the anterior one bifid at l the tip. 
ceret doa er diameter, 2-05; serpa diameter, 1:8 mm. 
Two pairs of valves, taken in F. Petterd/). 
The reference of this little shell to panic is because its 
dentition agrees with the emended description of the genie as. 
implied by Bernard in Bull. Mus. Hist. Nat., 1897, p. 311. 
Carditella delta, spec. nov. 
Shell equilateral, subequivalve, trigonal, compressed with pro- 
duced straigh inted umbones. The dorsal lines slope very 
rapidly from the umbones which are in contact ; the post-dorsal 
margin slightly arched, the anterior-dorsal straight ; the e 
and escutcheon occupy deep elliptical depressions, angulated o 
the margin. The ventral margin is arched, and is distantly 
crenulated within 
