CARBONIFEROUS FOSSILS OF IRELAND. 175 



Pentremites florealis. Sa^. 



Pentremites florealis. Sai/. Jour. Acad. Nat, Sc. Phil. — Pentremites ovalis. Pfiil. Pal. Fos. (not of Gold.) 



One or two obscure fragments of a Pcutremite, have occurred, wliicli, by tlieir very broad ambulacra, and 

 general form, seemed identical with Professor Phillips's species, but certainly not with Goldfuss's. Captain 

 Portlock has also observed the P. ovalia in the carboniferous limestone of Sligo, but, I'rom his observations, 

 it would seem that his specimen too was more allied to that figured by Professor PhiUips, than by Professor 

 Goldfuss. The former seems to me identical with Say's P.Jiorealis. 



Platycrinus. Miller. 

 Gen. Ch. — Column elliptical, the joints of which articulate by a transverse ridge; pelvis of three, unequal 

 pieces (one piece, according to Mr. Austin) supporting five large scapulae. 



Platycrinus contractus. Phil. 



Platycrinus contractus. Pliil. Gcol. York. 



Sp. Ch. — Pelvis acutely conical; scapula; nearly twice as long as wide, narrower above than below; sur- 

 face smooth. 



This species is rendered remarkable by the contraction of the upper part of the cup, residting from the 

 narrowing of the scapula; at tlieir superior end ; it is distinguished from the P. similis, M'Coy, which has 

 the same character, by its lengthened pelvis. 



Platycrinus elongatus. Pliil. 



Platycrinus elongatus. Phil. Geol. York. 



Sp. Ch. — Pelvis elongate, conical; scapula; of equal width, straight, one-third longer than wide; articula- 

 tions small ; surface smooth. 



This species is rendered remarkable by the great elongation of the scapula and pelvis ; from the P. contrac- 

 tus, which is almost equally elongate, it is distinguished by having its scapula of equal breadth above and 

 below ; the proboscis is very long. 



Platycrinus expansus. M'Coy. (PI. XXV. tigs. IS, 19). 



Sp. Ch. — Pelvis wide, flat, deeply divided; scapulae very large, wider than long; articulations prominent, 

 large ; width of the body at scapular articulations twice the length. 



This fine species is distinguished from all of the genus by the gi'eat width of the body in proportion to 

 the length, owing to the scapulae being short, and wider above than below ; the markings are similar to 

 those of the P. ellipticus of PhilUps, from which, however, its form and proportions will at once tlistinguish it. 

 Length ten lines, width one inch seven lines. 



'*&" 



Platycrinus gigas. Phil. 



Platycrinus gigas. Phil. Geol. York. 



Very large specimens of a smooth Platycrinus, closely resembling the Plat, lavis of Miller, and fjiijas of 

 Phil., but not shewing the interscapular plates, have occurred. 



