potekioceinid^e rentacrinus. 127 



Formations and Localities. 



In the Lias, at Lyme Regis, Dorsetshire; at Pyrton Passage, Gloucestershire ; and 

 at Magilligan, Ireland. P 



Dr. Goldfuss notices its occurrence in the marly beds of the Jura formation, which 

 beds, he considers, correspond with the Oxford Clay of England. It is said to occur 

 at Baireuth, Banz, Amberg and Boll. 



It appears strange that while our acquisitions to palaeontology have so much increased 

 of late years, particularly as regards this class of animals, we should have been so long 

 batHed in our researches after the body of the P. hasaltiformis, a circumstance almost 

 unparalleled in the whole course of investigation of the Crinoidea. Of the columns we 

 find countless thousands, but not a single body has yet been discovered. In a marly 

 bed of the lias at Lyme, the fragments of columns of this species are as thickly dis- 

 seminated as the crystals of quartz and felspar are scattered through some granites, but 

 no portion of the body is met with. In other instances columns of considerable length 

 are seen, but no indication of the superior part of the animal presents itself. 



10. Species, Pentacrinus subsulcatus. (Munslcr.) 



This species has been founded on a few small fragments of the column, and detached 

 portions of the claspers. The column is obtusely pentagonal and equal jointed ; the 

 striae on the articulating facets occupy the margin, and inwardly to the central canal, 

 but with smooth interspaces of considerable size. 



Enlarged representations of this crinoid are given by Goldfuss. PI. 53, f. 4, p. 175. 



11. Species. Pentacrinus subteres. {Munslcr.') 



The column is equal jointed, and but slightly pentagonal ; the strite are chiefly 

 marginal, though five narrow bands of striie diverge from the central canal, and meet 

 those on the margin. 



Figures representing this species from the Jurassic rocks are among the illustrations 

 in Goldfuss, PI. 53, fig. 5, p. 176. 



Since this portion of our work was sent to the press, Mr. Stutchbury has been kind 

 enough to direct our attention to some fragments of columns, evidently of a Pentacrinus, 



