Vol. 52.] A DELIMITATION OF THE CENOMANIAN. 145 



species or a well-marked and unusual variety of that species. It 

 is generally rather over an inch long and rather less than an inch 

 broad, and about if inch high. It is inflated below, and the vent 

 is placed high. The anteal sulcus is bounded on each side by a 

 ridge, which swells out near the top and gives a peaky character 

 to this part of the test. 



Mr. Sharman informs us that it comes nearest to a specimen in 

 the Museum at Jermj T n Street from the Middle Chalk of Dover, to 

 which Prof. Forbes attached the MS. name of Cardiaster Coclchurni. 



Pygurus lampas, De la Beche, Wright, ' Cretaceous Echinodermata,' 

 p. 258, pi. lviii. fig. 1. 



The original specimen of this sea-urchin was found by Sir H. De 

 la Beche near Lyme Regis in what he took to be Upper Greensand ; 

 but as it has never been found again in the Upper Greensand of 

 Devon, and as Mr. Meyer has obtained a specimen from his Bed 10 at 

 Dunscombe, it probably came from the same horizon near Lyme Regis. 

 Many of the blocks on the shore west of Lyme consist partly of the 

 topmost bed of the Greensand and partly of the quartziferous grits 

 (Beds 10, 11, 12), and De la Beche might well have regarded the 

 whole mass as Greensand, for what looks like the base of the Chalk 

 succeeds No. 12 (see p. 111). 



This species is occasionally found in the Cenomanian of Le Mans, 

 and also occurs at Fouras in the Charente lnferieure ; it is therefore 

 a conspicuous link between the Cenomanian of Devon and Western 

 France. 



Salenia Clarkii, Forbes, in Wright, ' Cretaceous Echinodermata,' 

 p. 177, pis. xxxviii., xxxix., & xlii. 



A large Sdlenia occurs in the lower part of the Devon Ceno- 

 manian Bed 11, and again in the highest bed (13). It comes 

 nearer to S. ClarJai of the Lower Chalk of Dover than to any other 

 figured species, though it does not quite agree with Dr. Wright's 

 type. A large specimen measuring more than an inch in diameter 

 has been deposited in the Museum at Jermyn Street. 



Salenia petalifera, Ag., var. 



Some of the specimens referred to this species also differ in some 

 respects from the type, and somewhat resemble S. scutigera, Gray. 

 The zone of small tubercles on the interambulacral areas is very 

 narrow and sinuous, and the apical plate exhibits some characters 

 which, if constant, would differentiate it from S. petalifera. 



Polyzoa. 



€eriocava ramulosa, Mich., sp., l Icon. Zoophyt.,' and d'Orbigny, 

 ' Pal. Fr. Terr. CreV vol. v. p. 1017, pi. 788. figs. 11 and 12. 



This is a large coral-like organism, branching dichotomously, 

 often 4 or 5 inches in length, and consisting of a number of con- 



