The Cretaceous Fauna of Pondolaml. 297 



but in the lattei- the height and length are equal, the apical 

 angle is larger, the ribs are larger and more distinctly of different 

 sizes. 



Remark. — This species is at present known by a single left valve. 



Section ^QUIPECTEN, Fischer. 

 Pecten (^quipecten) Kossmati, sp. nov. 

 Plate XXXV., fig. 11. 



Description. — Left valve ovate, almost equilateral, slightly higher 

 than long, of very small convexity. Antero- and postero-dorsal 

 margins rather long, nearly equal, almost straight ; the remaining 

 margins form a regular curve. Apical angle about 95°. 



Ornamentation consists of 16 strong, narrow, straight radial ribs 

 which are sharply limited and have rounded summits with scaly or 

 lappet-like projections. Near the anterior and posterior margins the 

 ribs are rather closer together. The interspaces are flat, and much 

 broader than the ribs, and are ornamented with fine but somewhat 

 irregular striae ; on the median part of the valve these striae are 

 parallel with the ribs, but on the anterior and posterior parts they 

 curve outwards and cut the ribs obliquely. 



Anterior ear large, with its outer angle rectangular, ornamented 

 with two or three strong radial ribs and with growth-lines. Posterior 

 ear smaller than the anterior, with its outer angle obtuse, ornamented 

 with a few radial ribs having scaly projections. 



Left valve not seen. 



Length 18'5 mm. ; height 20 mm. 



Affinities. — This species resembles P. acute-plicatus, Alth,='' from 

 the Senonian of Lemberg (Galicia), but differs in having broader and 

 flatter interspaces with radial striae, and in having a smaller apical 

 angle and larger ears. 



Sub-genus CAMPTONECTES, Meek. 



Pecten (Camptonectes) sp. 



Plate XXXV., figs. 12, 13. 



Description.- — Eight valve ovate, slightly inequilateral, with the 



dorsal third pointed, and the margin of the remaining part forming 



* Geogn.-palseont. Beschreib. v. Lemberg (Haidinger's Naturwiss. Abhandl., 

 vol. iii., pt. 2, 1850), p. 248, pi. xii., fig. 34. Kner, Kreidverstein. v. Ost- 

 Galizien (Denkschr. d. k. Akad. Wissensch. Wien, Math.-nat. CL, vol. ill., 1852). 

 p. 316, pi. xvii., fig. 1. E. Favre, Moll, Foss, Craie de Lemberg (1869), p. 148, 

 pi. xiii., figs. 3, 4. 



