201 
Hab.—Off Cape Jaffa, in 300 fathoms; 3 alive and 12 
valves; in 130 fathoms, 1 alive and 11 valves. 
Diagnosis.—It is very closely allied to the Cuspidaria 
perrostrata, Dall, Bull. Mus. Comp. Zool., Harvard Coll., Cam- 
bridge, x1i., 1885-1886, p. 296, pl. ii., figs. 3a, 3b, obtained in 
339 fathoms, off Tortugas, and in 416 fathoms, gray ooze, 
near Grenada. Also in Bull., 37, United States National 
Mus., 1889, p. 66, pl. ii., figs. 3a, 3b. My species has a shorter 
rostrum, and the three bold ribs give it a distinct aspect. 
Dall says there is a good deal of variation in this group, and 
though my specimens vary scarcely at all, they may prove 
to be a variety of Dall’s species. This shell contributes ano- 
ther new subgenus to the South Australian record, viz., Car- 
diomya. 
Cuspidaria (Halonympha) ros, n. sp. Pl. xiii., figs. 1 to 4. FVE, 
Shell small, inflated, pyriformly orbicular, very thin, 
diaphanous. Umbos visible, tumid directed somewhat back- 
wards. Post-dorsal border a gentle incurved slope; anterior 
nearly continuous with the posterior for about two millimetres, 
then sweeping with an almost circular curve round the whole 
front and ventral border, to merge into the obliquely upward 
slope of the lower border of the rostrum, which is short, 
rather tapering, and round-ended. 
Immediately beneath the minute approximate apex of 
each umbo is a projection carrying a tiny elongate cartilage 
pit. Some little distance behind this a wide-curved hollowed 
lamina, like half the bowl of a spoon, stands out in each valve. 
There is a small elongate laminar cardinal tooth in front 
of the fossette of the right valve; none in the left. 
The surface is smooth, but for microscopic concentric 
striz, chiefly near the ventral margin. 
Dim.—Antero-posterior diameter, 6 mm.; umbo-ventral, 
4; sectional of closed valves, 2°5 mm. 
Locality.—300 fathoms, off Cape Jaffa, 2 alive and 3 
valves; 130 fathoms, 3 alive and 14 valves. 
This new species introduces, for South Australia, a new 
subgenus, Halonympha, created by Dall and Smith, with 
Neera claviculata, Dall, as the type (Bull. of Mus. of Comp. 
Zool., Harvard Coll., Cambridge, vol. xii., 1885-1886, p. 301). 
It is characterized by an acute cardinal tooth in the right 
valve, none in the left; a small central fossette, and by a 
clavicular rib or myophore in the posterior part of each valve. 
Our shell is very closely allied to Newra claviculata, Dall, 
Bull. Mus. Comp. Zool., 1881, vol. ix., p. 112, and Halo- 
nympha claviculata, Dall, Bull. Mus.. Comp. Zool., Harvard 
