400 



J. F. BLAKE AND W. H. HUDLESTOX ON 



In the nearly allied form P. strict us, Munster, every 5th or 6th rib 

 in the right valve is enlarged, and in the left the ribs predominate. 

 They both occur together. 



Plicatttl2e. 



There are several species noted in the Corallian beds which have 

 not yet been recognized ; but they are not in sufficiently perfect pre- 

 servation to warrant our naming them further than by comparing 

 them to their nearest allies. 



Grypblea subgibbosa, spec. nov. PL XYI. fig. 7. 



At first sight one might take this great Gryphcea as merely a 

 variety of G. dilatata ; but as it seems to be always confined to a par- 

 ticular horizon, and to present a constant feature in its shape, it 

 becomes worthy of notice. It is gibbous on the posterior side, 

 rising up into a shoulder, something like G. gibbosa of Leseur (see 

 Dollfus, ' La Faune Kim. du Havre,' pi. xvii. fig. 5), but obviously 

 differing from that species. Known to us only in the cement-stone of 

 North Grimston, where it is very common. 



Glyphea ferruginea, spec. nov. PL XV. fig. 10. 



This species is very closely allied to G. rostrata, Phil., which 

 occurs on a much lower horizon ; but differs from it in the general 

 shape, the lower margin being more convex. Also the anterior 

 lateral furrow runs right forward to meet the cervical furrow at an 

 acute ang]e, instead of having a lobe from the gastric region inter- 

 vening. These lateral furrows are also more deeply impressed and 

 more parallel. 



It occurs in the Ironstone of Abbotsbury. 



In PL XVI. fig. 1, is represented a curious crustacean fragment 

 from the Coral Rag of Upware, which has been prolific in organisms 

 of this class. It presents the appearance of a carapace like that of 

 small spider-crab ; but its slight want of symmetry indicates rather 

 a joint from one of the legs. 



List of the Continental Fossils recognized as British for the first time, 

 so far as may be gathered from Publications. 



Name. 

 Nautilus aganiticus, Schl. 



Acteonina miliola, D 1 Orb. 

 Nerinsea fusiformis, If Orb. 



Desvoidyi, If Orb. 



Notes. Localities. 



Coral Rag, Grimston 



Field. 

 Limestones, North Dorset. 

 So named in some Rag of Brompton, &o. ; 

 collections. shell-beds, Pickering. 



Trigonia - beds, Wey- 

 mouth. 



Cerithium inornatum, Buvig. Referred to Eulima Rag of Ay ton, Brompton; 



IcEvigata, Lye. t. 31. shell-beds, Pickering, 

 fig. 3. Perhaps also 

 the Chemnitzia me- 

 lanioides, Phil. 

 Humbertinum, Buvig. Rag; Ay ton, Faringdon, 



