viii, a, 4 Smith: Fossil Invertebrate Fauna 279 



cross teeth ; laterally from 2 to 5 large ridge-like teeth parallel to 

 the hinge line. The posterior muscle impression is frequently 

 affixed to one or more strongly protruding thin plates, (Zittel.) 



Cucullaea holoserica Rv. ( ?) Plate IX, figs. 4 and 5. 



The form here shown is another one of those left from the 

 old Spanish collection and to which there is no label attached. 

 It is also a cast, and therefore little that is definite can be said 

 about it. 



Locality: Either Cebu or Panay. 



Formation: Limestone. 



ASTARTIDJE 



CAEDITA Bruguiere 



Shell oblate and 4-sided, very unequally sided, radially ribbed, 

 edges toothed or crenulated ; beak wide and thrust forward, liga- 

 ment external ; teeth 1 : 2 diverging and unequal. In addition 

 there is a swelling-like process posteriorly developed. The 

 muscle impression is strongly developed. From the Trias to the 

 present. (Zittel.) 



Cardita boettgeri K. Mart. Plate IX, fig. 3. 

 Tertiarscht. auf Java (1880), PI. XVII, fig. 10. 



This specimen is somewhat worn so that the little nodes on 

 the ribs do not show any longer. I compared it directly with 

 the forms in Martin's Javan collection, and this Philippine form 

 is a trifle smaller and has thicker ribs, but otherwise is quite 

 the same. 



Locality : Puerto Princesa, Palawan, No. 778. 



Formation: Recent. 



TRIDACNIDiE 



TRIDACNA Bruguiere 



Shell massive, 3-sided, with radial ribs, which have scaly 

 leaves ; margins deeply notched, the anterior side below the beak 

 possessing a cleft for the byssus; hinge on either side with a 

 recumbent hinge tooth and a moderately thick lateral tooth 

 similarly situated. Recent and Miocene. Many species reach 

 colossal size. (Zittel.) 



The genus is common both fossil and living in the Philippines. 

 One individual is reported to have measured 3 meters in length. 

 I have seen one specimen 1 meter long. 



H8365 6 



