PECTBN. 163 



Stone of CliciTy Hinton and Burwell. Zone of 11. sulxjlohoms of Hitcbin. Lower 

 Chalk of AVest Row near Mildenluxll, and Stoke Ferry. 



Pectkn (Camttoneotes ?) GAULTiNUS, sp. nov. Plate XXX, figs. 1 a, b, 2. 



Description. — Shell small, oval, a little higher than long, convexity small ; 

 somewhat inequilateral, the antero- dorsal border slightly concave and longer than 

 the postero-dorsal, which is slightly convex. Bars very uneqnal. Apical angle 

 from 95° to 100^ 



Right valve flattened, nearly smooth, with faintly marked, nearly straight 

 radial ribs near the anterior and posterior borders, separated by narrow punctate 

 grooves ; riljs and grooves absent or indistinct on the middle of the valve, except 

 near the umbo. Anterior ear long, with a deep sinus, and three or four radial ribs 

 crossed by growth-ridges. Posterior ear small, with its outer angle obtuse. 



Left valve rather more convex, with similar oi'namentation. 



Measurements : 



(1) (2) (3) (4) 



Length . 22 . 15 . 14 . 17 mm. 

 Height . 19 . 17 . 16 . 19 „ 



(1-3) Gault, Black Ven. 

 (4) Gault, Folkestone. 



lii'Diarhs. — This species differs from the typical Camplonedes in having the 

 punctate gi-ooves nearly straight instead of curving outwardly. 

 Types. — In the Woodwardian Museum, Cambridge. 

 Distrihutloii. — Gault of Folkestone and Black Ven. 



Sub-genus — Chlamys, J. F. Bolteii, 1798. 

 (' Museum Boltoniauuni,' p. 1(J5.) 



Pecten (Chlamys) fissicosta, Ether'uhje, 1881. Plate XXX, tigs. 3, 4, 5c?, b, 



1881. Pecten fissicosta, B. Ether'uhje. lu W. H. Penning and A. J. Jukes- 

 Browne, Geol. of Cambridge (Mem. 

 Geol. Survey), p. 141, pi. ii, fig. 1 ; 

 pi. iii, fig. 1. 



