270 The Philippine Journal of Science im 



LAMELLIBRANCHIATA 



solenim: 



AZOR Gray 



Diagonally elongated; beak almost central; upper and lower 

 margins straight and parallel; the two hinge teeth of the right 

 valve very close, those of the left farther apart, the posterior 

 tooth frequently stunted; the ligament nymphs wide, inflated; 

 anterior muscle impression elongated, posterior pear shaped; 

 surface marked by sharp lines. Cretaceous to Recent. (Zittel.) 



Azor coarctatus Gm. Plate VII, fig. 1. 



Tagelus (Solen) coarctatus Gm. 



Linn. Syst. Nat. ed. 13 (1790), 1, 3227. 



This form seems to be identical with Tagelus coarctatus col- 

 lected by Cuming at Calaumana, Luzon. This species was first 

 found near Naples and was figured in Reeve's monograph. 



The shell is oblong, pale, fulvous, compound, covered with a 

 wrinkled epidermis, narrowed in the middle, smooth, rather 

 truncated, and open at each end ; dorsal margin somewhat sloped. 

 This is also very like Psammosolen coarctatus Gm. from the 

 Vienna Basin. 



Another specimen in the Bureau of Science collection, but not 

 figured here, corresponds fairly well in external appearance to 

 Tagelus caribbseus Lam. 



Locality : San Rafael, Agusan River, Mindanao, No. 1054. 



Formation : Recent shale. 



Recently I found in the upper (Pliocene) limestone, Bondoc 

 Peninsula, Tayabas Province, Luzon, a specimen — little more 

 than an impression of one valve — of an Azor, about 25 centi- 

 meters long and 10 centimeters high. This is the largest speci- 

 men of this, living or fossil, I have ever seen. 



CULTELLUS Schumacher 



Shell narrow, strongly elongated, oval, compressed; lower 

 margin curved, beak near the anterior margin ; hinge teeth 1:2; 

 anterior muscle impression round, posterior oval longitudinally; 

 pallial sinus very wide, but short. Tertiary and Recent. 

 {Zittel.) 



