TECrrEN. 157 



Loft valvu inodcrately convex, with ornamentation similar to that of tl)e rig'ht, 

 l>iit the concentric gi'ooves are rather more distinct and not so close together; the 

 radial striee are more distinct and cover a larger part ' of the valve. Anteiior ear 

 large, triangular, outer angle about 90°, height nearly or quite equal to length, 

 with concentric ridges and i-adial striae. Posterior ear much smaller and lower. 



Meafiuremcnts : 



(1) (2) (3) (i) (5) ((i) 



Length . o5'5 . 45 . 49 . 53 . 57 . 70 inin. 



Height . 37 . 49 . 54 . 50 . 60 . 78*5 „ 



(1—5) Perna-hed of Atlierfield. 



(6) Lower Greeusautl of Whale Chine. 



Affinities. — This species is allied to P. cinctus, but differs in being less convex, 

 higher than long, distinctly inequilateral, smaller, in having the concentric grooves, 

 and usually also the radial strias closer together, the ears more unequal, and the 

 byssal sinus deeper. 



BemarJcs. — A few small specimens (10 to 17 mm. long) from the Atlierfield 

 Beds of East Shalford, in the Meyer Collection, may be young examples of P. 

 Gottaldimis, but they also closely resemble P. Grepplni, Pictet and Renevier." 



Typt'S. — D'Orbigny's specimens came from the Neocomian of Auxerre, etc. 

 The specimen referred to 1'. circnhiris by Forbes is in the Museum of the Geological 

 Society (No. 2030). 



DldrihuUou.— Perna-hed of Atherfield. Lower Greensand (either Scaphites or 

 Lower Grioceras Groups of Fitton) of Whale Chine. Recorded by Topley (1875) 

 from the Atlierfield Beds of Peasmarsh and Shalford. 



Peoten (Camptoneutes) sTuiATO-PUNCTATus, Ihoiiirr, 1839. Plate XXIX, figs. 4 (i,b, 5, 0. 



1839. Pecten HTuiATo-PUNcrATUrf, F. A liiimer. Die Versteiu. d. nord-deutscli. 



Oolith.-geb. Nachtrag., i>. 27. 

 1811. — — — Die Versteiu. d. uord-deuts(h. 



Kreidegeb., p. 50. 

 1847. — — A. (.VOrhlijinj. Pal. Fran9. Terr. Cix't., vol. iii, 



p. 592, pi. ccccxxxii, figs. 4—7 

 1850. — — — Prodr. de. Pal., vol. ii, i)p. 



S^i, 119. 



1 Perhaps the whole iu perfectly preserved specimens. 



" ' Foss. Terr. Aptien de la Perte du Rhone, etc' (1858), p. 131, pi. xix, fig. 4. Pictet and Cani- 

 piche, • Terr. Oret. de Ste. Croix' (1870), p. 198. 



