REPOET ON THE LAMELLIBRANCHIATA. 



37 



Cartilage. — Posteriorly inclined, not in a pit or process, but attached to the valves. 

 Surface. — Concentrically striate. • 



Necera hrazieri, n. sp. 



Section Gt. — Subgenus Rhinomya, A. Adams. 



Teeth. — One lateral tooth on each side in the right valve, none in the left. 

 Cartilage. — Internal, attached to the valve under the beaks. 

 Surface. — Concentrically striate. 



Necera rugata, A. Adams.'"' 



pliilippinensis, A. Adams 

 {nee Hinds). 



Necera notabilis, Jeffreys.* 



lamellifera, Dall = semi- 

 strigosa, Jeffreys. 



Section H. 



Teeth. — One small conical tooth in front of the umbo in the right valve, none in left : 

 no laterals in either. 



Cartilage. — Narrow, vmder apex, parallel with margin. 

 Surface. — Concentrically striate. 



Necera phiJippinensis, Hinds. 



Section I. 



Teeth. — A single denticle in both valves in front of the beaks ; no laterals. 

 Cartilage. — Elongate, narrow, subparallel with the dorsal edge. 

 Surface. — Concentrically plicate. 



Necera abbreviata, Forbes. 



Section J. 



Teeth. — One small thickish tooth on each side in the right valve, and a similar one 

 in the left, in front only. 



Cartilage. — Very small, central. 

 Surface. — Finely ridged. 



Necera culuncct, Gould. 



