132 
Dimensions.—-Antero-posterior diameter, 2 mm.; dorsal-ventral 
diameter, 2 mm. ; sectional diameter, 1°5 mm. 
Locality.—In shell-sand, MacDonnell Bay ; several examples 
(Mr. A. Adcock). 
This little shell has rather the external form of Crenella than 
of Myrina, but as the ligamental pit is wholly excavated in the 
hinge, and not descending underneath it, as in the former, I refer 
it to the latter genus, which has hitherto been known in Aus- 
tralian waters only by one species-—M/. Coppingeri, E. A. Smith, 
Challenger Rep., from east of Cape York, in 1,400 fathoms. 
7] 
22 NO mg 
® 
ODD Vy ys 
10, 
INE 
ia 
EXPLANATION OF PLATE I. 
Lithodomus projectans. Nat. size. 
Turbonilla crenulifera. Enlarged 5 x. 
Ectorisma granulata. Left valve slightly enlarged. 
. Ectorisma granulata. Side view of hinge of right valve. 
Lithodomus cuneiformis. Slightly enlarged. 
Voluta Verconis. Slightly enlarged. 
Lucina paupera. Slightly enlarged. 
Mysella ovalis. Slightly enlarged. 
Columbella cominelleformis. Enlarged 2 x. 
Cardita gemmulifera. Enlarged 2°5 x. 
Lucina perobliqua. Nat. size. 
Myrina crenatulifera. Right valve, exterior, enlarged 8 x. 
Myrina crenatulifera. Right valve, interior, enlarged 8 x. 
