1901.] NATURAL SCIENCES OF PHILADELPHTA. 185 



only. The lunule is very narrow, beginning as a broad impres- 

 sion under the beak and tapers forward, ending in a shallow point 

 just above the anterior lateral tooth of the hinge. The anterior 

 area under the lunule is strongly defined by the termination of 

 the diverging lines, and is sculptured with irregular rough concentric 

 striie with more or less yellow epidermis in the interstices. The 

 gi'oove of the ligament is l)ounded on the inner side by a ridge 

 which begins as an angle near the beak and gradually becomes 

 higher to a point about four millimeters from the end of the hinge 

 line, then suddenly descends almost to the end of the hinge line. 

 The inner margin of the shell is smooth, neither layer being crenu- 

 late. The hinge of the right valve has a large heav}^ cardinal tooth 

 in the centre, with a deep pit on each side and a smaller cardinal in 

 front directed forward. The anterior lateral is a large tubercle 

 with a deep chink where the adductor muscle truncates it; there is 

 scarcely any trace of a tubercle at the posterior end of the hinge. 

 The left valve has the pits for the corresponding cardinals of the 

 right valve and a rather large posterior cardinal, an anterior laterail 

 like the other valve and no posterior lateral. The anterior adduc- 

 tor muscle scar is very long and narrow, while the posterior scar is 

 short oval. 



Alt. 29.5, diam. 82, thickness of right valve 8 mm. 



Locality. — Auckland, IS^ew Zealand. 



Types in the collection of the Academy of Natural Sciences of 

 Philadelphia, No. 63,758. 



This species differs from L. deniata "Wood in lacking the dentate 

 margin, from L. quadrisulcata Orb. in lacking the crenulate 

 margin. It is distinguished from L. cumingii Ad. and Ang. by 

 having a long narrow lunule, more delicate texture and lower beaks ; 

 it is also much less globose. 



Venus (Anomalocardia) malonei n. sp. PL V, figs, i, 5. 



Shell triangular, posteriorly rostrate, moderately convex, longer 

 than high, solid. The color is variable: some specimens are 

 creamy white with irresfular transvcse zigzag brown spots or 

 stripes, some are almost entirely dark brown, and others are light 

 brown with a few very light radial bands and dark-brown 

 blotches. The interior is generally purple, shading into a white 

 margin with a brown band within the pallial line, but some lack 

 the white margin. Sculpture both concentric and radial. The 



