viii, a, 4 Smith: Fossil Invertebrate Fauna 271 



Cultellus maximus Gm. Plate VII, fig. 2. 



This is a very fresh looking specimen which appears to have 

 been covered with mud for only a very short time. This species 

 is still living. 



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



Formation: Recent or Pleistocene shale. 



MYTILID^l 



MODIOLUS Lamarck 



Distinguished from Mytilus by the long trapezoidal or oval 

 shape, by the slightly narrowed and rounded anterior portion, 

 and by the weak beak lying somewhat behind the anterior edge. 

 (Zittel.) 



Modiolus sp. Plate VII, fig. 3. 



This specimen, except for a little distortion and one or two 

 cracks, is excellently preserved. Both valves are preserved, but 

 slightly separated by the bluish white shale matrix. The sur- 

 faces of the valves retain their original color and nacreous ap- 

 pearance. I have no doubt but that this is a well-known form, 

 but in the absence of adequate literature I shall refrain from at- 

 taching a specific name to it. The specimen is about 6.5 centi- 

 meters long. With the exception of the fine growth lines it has 

 no sculpture. 



Locality: Unknown (from the Spanish regime). 



Formation: Shale, Recent? 



CLEMENTIA Gray 



Shell subtrigonal, transversely oval, inequilateral, white, slen- 

 der, fragile ; the hinge bearing 3 cardinal teeth upon each valve, 

 the 2 anterior ones simple, vertical, and the posterior one bifid 

 on the right side, the anterior is simple and the 2 posterior oblique 

 on the left side; the ligament sunken; the interior edge of the 

 valves simple, pallial sinus deep, ascendant. (Fischer.) 



Clementia sp. Plate VII, fig. 4. 



The specimen shown here, while fairly perfect, is only a cast 

 so I am not able to make any specific determination. 



Locality: Unknown, probably Cebu or Panay (from the 

 Spanish regime). 



Formation: Limestone. 



