274 The Philippine Journal of Science i»i3 



the inner ligament in a central triangular hole just beneath the 

 projecting beaks which touch one another; muscle impression 

 large and subcentral. (Zittel.) 



Species of Pecten known from the Philippines. 



Pecten fricatum Rv. Pecten sulcatus Mull. 



Pecten senatorius Gmel. Pecten subarcuatus Bttg. 



Pecten leopardus Rv. Pecten reticulatus Rv. 



Pecten Solaris Rv. Pecten pallium Linn. 



None of these is mentioned in Martin's list in' the appendix 

 to Becker's report, and only one, P. leopardus, is given in Hi- 

 dalgo's list of living species in the Philippines. 



Pecten pallium Linn. Plate IX, fig. 6. 



Martin, Tertiarscht. auf Java (1880), PL XX, fig. 10. 



The form here shown is not exactly the same as P. Solaris 

 figured by Reeve. The ears are partly worn off the Philippine 

 form, and the secondary crenulations or small ribs are lacking 

 in solans. In the Quadras collection of living shells I find a 

 pecten with no specific name from Guam Island, one of the Ma- 

 rianne group. This shell is about the same size as the fossil form 

 shown here, and has practically the same crenulated ribs as well 

 as the same number. The living shell is strongly mottled red, 

 brown, and white. 



I have concluded, however, that this form is essentially the 

 same as P. pallium described by K. Martin from the Tertiary 

 of Java, though his specimen has one or - two fewer ribs (a 

 younger specimen, perhaps) and shows one ear missing. 



Plate X, fig. 1, shows a possible variety of the same species. 



Locality: Near Danao, Cebu, No. 272. 



Formation: Miocene limestone. 



Pecten sulcatus Mull. Plate IX, fig. 7. 

 Miiller, Zool. Dan. Prod. (1776), 248. 



This form, although somewhat worn, is so closely like P. sul- 

 catus that it is here referred to that species. The fossil has the 

 same number of ribs as the living form in the Quadras collection. 

 There is a minor difference, however, namely the distance 

 between the ribs. This may be accounted for by wear. The 

 two forms are of about the same size. 



Locality : Talamban near Panoypoy, Cebu. 



Formation: Mio-Pliocene, upper coral limestone. 



