±24 J. F. BLAKE OX THE KliDJERIDCfE CLAY OF ENGLAND. 



Belemxites xniDrs (Dollf.). 



Under this I have included the B. explanatus of Phillips, which 

 I cannot distinguish from it. As Prof. Phillips makes no allusion 

 to Dollfus's species, I presume it must have been unknown to him. 



B. Teoslotaxes (D'Orb.). 



This is inserted on the authority of Mr. Judd. I have seen no 

 specimen that could be fairly separated from B. nit id us. Dollf. 



B. SoncHn (D'Orb.). 



"With this I identify, with some doubt, a form which differs 

 somewhat from the type by its remarkable curyature and also the 

 shortness of its alyeolus. 



Bather common at the top of the Upper Kimmeridge, Chapman's 

 Pool. 



BoSIELLAEIA EASEXEXSIS, U. Sp. PI. XII. figS. 16, 17. 



A small species, showing 8 whorls, the two sides making an angle 

 of about 40°. The last whorl has 11 transverse ribs, most elevated 

 at the top, gradually fading below, with a slightly backward bend, 

 concave towards the mouth ; above the ribs the surface is cut off 

 angularly to the suture. The whole is covered by veiy regular 

 minute longitudinal ribs, both above and across the transverse ones. 

 In the last whorl but one I count 15 ribs. Canal not very long. 

 Length -§- inch. 



When young this rather calls to mind Tertiary forms of Fusus, 

 and when adult resembles the early whorls of Pterocera suprajurtnsis 

 (Cont.), from which it differs in the shape and persistence of the 

 transverse ribs. 



Lower Ximmeridge, Market Basen. Many examples in the 

 Cambridge Museum. 



Xatica rrxcirLATA, n. sp. 



Small ; angle of spire about 76°: the last whorl ornamented with 

 numerous, regular, longitudinal, punctated stria?. Height j inch. 



The ornamentation of this shell distinguishes it from all other 

 Eimmeridge ffatiece. 



A single specimen in the Cambridge Museum, frorn the Lower 

 Ximmeridge. Market Basen. 



CEEiTHror FOETieosiAror, n. sp. PI. XII. fig. 13. 



Whorls visible S ; angle of spire 15°; ornamentation variable, 

 from 13 to 16 transverse ribs, rising to a point at the top, above 

 which the surface is cut off square to the suture : but this portion 

 is very narrow, and is waved by the influence of the ribs. The 

 upper whorls have from 4 to 6 smaller, very regular longitudinal 

 ribs rising upon and marking the transverse ones, which thus 

 become knotted. The under surface of the last whorl is also 

 marked with more longitudinal ribs. Length | inch. 



The variability of the transverse and longitudinal ribs is not at all 

 connected: so that we mav have one shell with 13 transverse 



