The Invertebrate Fauna of the Uitcnhage Scries. 65 



CLASS LAMELLIBRANCHIATA. 



GENUS PECTEN 0. F. Miiller.* 

 SUB-GENUS SYNCYCLONEMA F. B. Meek. 



PECTEN (SYNCYCLONEMA) ORBICULARIS J. Sowerby. 

 Plate II., figs. 2, 3. 



1817. Pecten orbicularis J. Sowerby, Mineral Conchology of Great 



Britain, vol. ii., p. 193, tab. 186. 

 1902. Pecten (Syncyclonema) orbicularis H. Woods, Mon. Cret. 



Larnell. Engl., vol. i., part iv., p. 145, pi. xxvii., and 



text-fig. 1. (Palaeontographical Society.) 



Two specimens sent to me from the South African Museum appear 

 to differ in no respect from typical examples of this widely distributed 

 form. One of the specimens, a single valve, has a delicate concentric 

 banding extending over the whole surface a character by which it may 

 be recognised as a right valve. With the exception of its imperfect 

 preservation in the umbonal region and its somewhat smaller dimen- 

 sions, this specimen agrees very perfectly with the right valve 

 figured by Mr. Woods in pi. xxvii., fig. 11 of his monograph (see 

 above). The other specimen appears smooth to the naked eye, but 

 shows minute and delicate, faint concentric markings under the lens. 

 This represents a left valve, and it has the anterior ear preserved. 

 Length 26'5 mm.; height 28 mm. 



A small specimen (a left valve) referable to the same species was 

 found by Mr. Eogers in the Coega Eiver Valley. Length 13 mm. ; 

 height 15 mm. 



Locality. Sunday's Eiver (279, 280). Coega Valley, on the left 

 side of the valley, half a mile down from the railway (453g). 



SUB-GENUS CAMPTONECTES F. B. Meek. 



PECTEN (CAMPTONECTES) COTTALDINUS d'Orbigny. 



Plate II., fig. 4. 



1847. Pecten cottaldinus A. d'Orbigny, Paleont. Fran9., Terr. Cret. 

 vol. iii., p. 590, pi. 431, figs. 7-11. 



* For a full account of the generic and sectional divisions of Pecten see Verrill 

 (1) ; for further references to recent literature on this subject consult Woods (3), 

 vol. i., p. 145 (1902). 



