viii. a, 4 Smith: Fossil Invertebrate Fauna 275 



Pecten senatorius Gmel. 



Martin, Tertiarscht. auf Java (1880), PL XX, fig. 11. 



At the time the plates for this paper were being drawn no 

 good specimens of this form existed in the Bureau of Science 

 collection, but since then several good specimens have been 

 obtained from the "Upper Limestone" of Bondoc Peninsula, 

 Tayabas, Luzon, which certainly belong to this species. 



An imperfect specimen was also found in the Mio-Pliocene 

 limestone near Danao, Cebu. 



CHLAMYS Bolten 



(&quipecten) 



Shell somewhat inequivalved, broadly rounded, anterior ears 

 generally somewhat larger; outer surface radially striated or 

 ribbed; ribs scaly or cross striated. From the Trias to Recent. 

 (Zittel.) 



Chlamys (.ffiquipecten) (?) sp. indet. Plate VIII, fig. 4. 



F. Sacco, Moll. Terz. del Piemonte, PL XXIV, fig. 1; and PL VII, 

 fig. 11. 



This is an incomplete specimen, the ears of which are entirely 

 missing. The nearest forms, which I have been able to find 

 to which it bears any resemblance whatever, are A. mioalternans 

 Sacco and A. northamptoni Micht. in the Pliocene of Italy. I 

 must say that I do not see much resemblance between this Philip- 

 pine specimen and any species belonging to the genus Chlamys. 



Locality: Liguan, Batan Island, southeast coast of Luzon, 

 No. 1. 



Formation : Upper limestone ; Miocene or Pliocene. 



SPONDYLID^E 

 SPONDYLUS Linnajus 



Inequivalved, irregular, with the right valve attached, radially 

 ribbed, spiny, or foliated; beaks unequal, in addition ears on 

 each side; lower shell with a 3-cornered area in the middle of 

 which for the most part is a row of pits. The straight hinge 

 line bears on each shell 2 very strongly curved teeth which fit 

 into the corresponding holes of the opposite valve; between 

 those there is a pit for the inner row. The muscle impression 

 is doubled, in old individuals, serrated. 



The numerous recent species are best developed in the tropics 

 and in the temperate zones, and are especially characterized by 



