MOLULUSCA. 
V.-LAMELLIBRANCHITATA. 
By Epaar A. Smita, 1.8.0. 
(Plates II. and IIL.) 
CUSPIDARIA TENELLA. 
(Pl. IL, figs. 14, 14a.) 
SHELL rather large, very thin, considerably convex, broadly rounded in front, 
narrowly or rather shortly rostrate posteriorly, whitish, covered with a thin perios- 
tracum, sculptured with distinct lines of growth and concentric waves; inner surface 
smooth, but concentrically sulcate, the shallow sulci corresponding with the external 
waves ; dorsal margin of right valve delicate, with a small ligamental pit (see fig. 14a) 
directed obliquely backwards beneath the umbo, a raised ridge extends from this 
ligamental process, parallel with the edge of the valve, and might be regarded as a 
posterior lateral tooth ; adductor scars and pallial sinus indistinct. 
Length, 30 millim. ; alt., 22; diam., 15. 
Off Coulman Island, 100 fathoms. 
This is a large species, but very thin, and somewhat resembles C. optima, Sowerby, 
from South Africa. It is, however, somewhat different in form, is much more delicate 
in substance, and the ligamental pit and hinder lateral tooth are different. Only a 
single right valve was obtained. 
ANATINA ELLIPTICA. 
(Pl. IIL, fig. 3.) 
Anatina elliptica, King and Broderip : Smith, ‘Challenger,’ Lamellibranchiata (1885), p. 76; id. ‘ Southern 
Cross,’ Mollusca, p. 210, pl. xxv., figs. 9, 10. 
Winter Quarters, 10-130 fathoms. 
To show the variation in form, a figure is now given of a short example, which is 
very different from that figured in the ‘ Southern Cross’ report. 
THRACIA MERIDIONALIS. 
Thracia meridionalis, Smith, Lamellibranchiata, ‘ Challenger’ Exped., p. 68, pl. vi., figs. 4—4b. 
Holes 4, 12, etc., 20-130 fathoms. 
The largest specimen obtained exceeds the dimensions of any of the ‘ Challenger’ 
