278 ^ e Philippine Journal of Science ms 



I judge from the nature of the petref action that it came from 

 the Miocene-Pliocene limestone of Cebu or the same horizon 

 on some other island, most probably Panay, as Abella did a 

 great deal of his geological work on that island. This author 

 mentions having found several species of Cardium. 2 * 



ARCIDiE 



ARCA Lamarck 



Shell obliquely elongated, sides unequal, valves equal, more or 

 less 4-sided, upper surface generally radially ribbed or striated, 

 borders smooth or crenulated ; beak forward of the center of the 

 shell; through a more or less high, plane, rhombic area are 

 "V"-shaped or bow-shaped furrows, separated from one another, 

 for the insertion of the ligaments. The ligament covers the 

 whole or a great part of the hinge area. Hinge line straight; 

 teeth numerous, apparently of the same size, set diagonally to 

 the hinge line and more or less parallel to each other. The 

 numerous little cross teeth, perhaps, originate from two long 

 drawn out ridge-like hinge teeth. The pallial line is simple, the 

 two muscle impressions are comparatively large. (Zittel.) 



Area nodosa K. Mart. (?) Plate IX, fig. 2. 



Tertiarscht. auf Java (1880), PI. XVIII, fig. 12. 



The form shown here is closely related to Area nodosa, 

 although it does not show much development of nodes. It may 

 be a variety or a young specimen. 



A good specimen of this species was found recently on Bondoc 

 Peninsula too late to be figured here. 



Locality: San Rafael, Agusan River, Mindanao. 



Formation : Recent shales in river bank. 



Another species, which is given in Martin's list of the Semper 

 collection, is A. granosa Linn. This has also been found recently 

 in Bondoc Peninsula, Tayabas, Luzon. 



The living fauna of the Philippines contains a great number 



of species of Area, some of which are 5 or more centimeters in 



length. 



PARALLELODONTID^ 



CUCULIAEA Lamarck 



Shell rhombic or trapezoidal, highly arched; beak separated 

 by a wide hinge area; hinge line straight, in the middle little 



a Descripcion fisica, geologica y minera en bosquejo de la Isla de Panay. 

 Manila (1890), 138. 



