﻿10G 



SUPPLEMENT TO THE CRAG MOLLUSCA. 



Pecten septemradiatus, Chemn. Crag Moll., vol. ii, p. 30, Tab. 4, fig. 2 (as Pecten 



Danicus). 



Locality. Red Crag, Sutton and Foxhall. 



This species was figured in the ' Crag Mollusca ' from a Clyde bed specimen, and I 

 mentioned (p. 31, note) that a worn specimen of my own from the Red Crag might belong 

 to this species. Mr. A. Bell gives it from the Red Crag nodule pits at Poxhall (' Ann. and 

 Mag. Nat. Hist.,' May, 1871). I therefore retain it as a fossil of the East Anglian 

 Upper Tertiaries, but with doubt. I have adopted the above name in obedience to 

 the rule of priority of nomenclature. 



Pecten Westendorpianus, Nyst. Crag Moll., vol. ii, p. 323, Tab. XXXI, fig. 25 (as 



P. maximus, var. larvatus), Supplement, Tab. VIII, fig. 1. 



Localities. Red Crag, Sutton and Waldringfield. 



In the ' Crag Moll.' at the above reference this was thought by me to be possibly a 

 variety of the common recent British shell, P. maximus, I having then only the fiat valve, 

 while M. Nyst's work, in which Westendorpianus is figured, showed only its convex 

 valve ( c Eoss. Belg./ pi. xviii, fig. 10). This did not justify me in referring my 

 specimen to Nyst's species, and I was unwilling, as mentioned at the time, to 

 call it a new species. Since this, however, M. Nyst, in the 'Bull, de PAcad. 

 Roy. des Sc. de Belgique/ has referred to my figure in the ' Crag. Moll.,' and observed 

 that it represents the upper valve of his species Westendorpianus. I am, however, now 

 able to introduce a figure of the lower or convex valve from a specimen which Mr. 

 Canham has lately obtained from the nodule pits in the Red Crag at Waldringfield, 

 which agrees with Nyst's figure. The rays are broader than those either of maximus or 

 Jacobcsus, and the depressions are deep and narrow, corresponding to the elevations of the 

 flat valve (Tab. XXXI, fig. 25), which interlock when they are closed. Mr. Canham's 

 specimen of the lower valve is the only one known to me, and the one I figured as the 

 flat valve is, I believe, also unique. 



Both of the specimens are probably derivative from some older Pliocene bed, though 

 as yet no trace of the species has occurred in the Coralline Crag. 



