PENTACRINUS. 



33 



The breadth of a disk is three-twelfths of an inch. 



I cannot find sufficient distinctions between this and some well-preserved fragments of 

 an Ophiura, discovered by the Marchioness of Hastings in the High Cliff at Barton, to 

 warrant the considering of the latter, at present at least, as a distinct species. 



Order.— CRINOIDEA. 



(See page 18.) 



Genus — Cainocrinus, Forbes. 

 (From Kaivos, new, and tpivov, a lily.) 



Cup basin-shaped, constituted of a pelvis formed out of five free plates, alternating with 

 five large ascending radials. Column obscurely pentagonal, furnished with articulated 

 ramides, arranged in distant whorls. Joints with stellated articular surfaces. 



I have instituted this genus for the reception of a very remarkable Crinoidal body, in 

 the collection of Mr. Bowerbank. The proportions and shape of the cup are such, that at 

 first glance it has more the aspect of a Palaeozoic than of a Tertiary Crinoid. It bears 

 also considerable resemblance to some of the less normal forms of Millericrinus. It is 

 however, a member of the same group with the Penfacrinus. I should not be at all sur- 

 prised, if some of the columns described here under the name of Pentacrinus were even- 

 tually to turn out portions of Cainocrini. 



1. Cainocrinus tintinnabulum. 



[Fig. 1. Nat. size. — 2. The cup and upper joints of column magnified. — 3. Portion of a column of the natural size. 

 4. The same magnified. — 5. A joint, with the sockets for the ramules.j 



Of this curious Echinoderm, the greater part of the cup with a portion of the column 

 attached, are preserved in the collection of Mr. Bowerbank, who procured them from the 

 London Clay, at Hornsey. Mr. Wethcrell has two fragments of columns, found near 

 Copenhagen House, which apj)eai' to belong to the same species. 



The cup measures ^th of an inch in height by two tenths in diameter. The column 

 attached is rather less than one twelfth of an inch in diameter. The cup is formed of five 

 rather large and gradually ascending pelvic plates, crowning a slender column, which does 



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