244 Messrs. H. Etheridge, Jun., and P. H. Carpenter on 



truncated and relatively large. Basals forming a strong 

 broad and deep cup. Hadials quadrangular, with projecting 

 lips, the body slanting sharply downwards, and the limbs, 

 which are rather longer than it, curving upwards towards the 

 summit, thus increasing its apparent breadth. Radial sinuses 

 long, narrow, and curved downwards, with a general angle of 

 111° to the plane of the summit. Ambulacra narrow, of nearly 

 uniform width throughout. Lancet plates small, scarcely 

 occupying the entire width of the sinuses. Side plates about 

 fifteen in number, large and strong, projecting above the mar- 

 gins of the sinuses and somewhat petaloid in shape. Orals 

 not apparent in a side view, though relatively large and tri- 

 angular, each with a strongly marked median ridge separating 

 the spiracles at its sides. Surface of the calyx ornamented 

 by strong and coarse concentric lines. Diameter of summit 

 7'5 millim. 



Obs. The outline of the calyx readily distinguishes this 

 species from the three found in the Eifel by Scliultze. It is 

 pyramidal from the base to the radial lips, while the latter 

 are clavate and obpyriform. Its pentagonal section will pre- 

 vent its being confounded with the decagonal P. anyulata, 

 nob., which has the interradial sutures raised, and not de- 

 pressed as in P. Malladce. The latter has larger orals than 

 P. similis, nob., while its calycular outline is totally different. 

 The longer, narrower, and more curved ambulacra and shorter 

 base separate it from P. lusitanica ) nob. ; while, on the other 

 hand, it has not the broadly truncated summit and narrow 

 elongated base of P. Paillettei and P. Schultzei. 



When describing P. stmt lis, we noted the resemblance in 

 the general form of its calyx to that of Orophocrinus. P. Mal- 

 ladve^ on the other hand, exhibits a digression towards Codas- 

 ter ; for the pyramidal outline of the calyx is not at all unlike 

 that presented by C. Hindei, nob. 



We have connected the name of this species with that of 

 Don Lucas Mallada, to whom we are indebted for the oppor- 

 tunity of describing both it and the two following species. 

 The material which he kindly sent us contained a single 

 specimen of what appears to be yet another species of Pentre- 

 mitidea, though it is too imperfectly preserved for us to venture 

 on any description of it. According to Homer *, Verneuii's 

 collection contains two other species of Blastoids from Astu- 

 rias, one of them resembling Orophocrinus inflatus in external 

 form. Unfortunately, however, they have never been de- 

 scribed, and we can therefore do nothing more than note their 



* Op. cit. p. 5o (376). 





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