540 Transactions. 
destined for posterior cardinal tooth of right valve. Before this large 
groove is a second but flat one, the posterior two-thirds of which is really 
base of destroyed anterior cardinal tooth. Behind central groove there 
e. 
Measurements (in millimetres) :— (a.) (b) с (.) 
Len 2; 65 70> 56 
Hei 60 63 45 
36 
) 
(b.) Internal cast from the same locality (Plate 54, fig. 2). Height is 
greater than stated. 
Localities.—(a) Shag Point, loc. 592; (b) Amuri Bluff, loc. 13; (c) Mal- 
vern Hills, loc. ) 
Affinities —Undoubtedly the fossils here in question belong to the genus 
L. veneriformis from the Upper Senonian of the island of Quiriquina, near 
Concepcion, Chile. Hupé called it Crassatella, In 1887 В. A. Philippi gave 
various specific names to this pelecypod, and placed it in the genus Mactra : 
à M. d'orbignyi, M. pinguis (3).  Moericke (4) described 
à specimen from tumida. In 1904 I 
also preoccupied, Lahillia (10). 
