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inclined to consider it as belonging to that genus, naming it ACTINOCRINITES 

 MONILIFORMIS, from the moniliform figure of its columnar joints, which preserve 

 that shape throughout the column, although alternately larger and smaller near 

 the pelvis. It is a large species appertaining to the transition and perhaps 

 Mountain limestone, in which latter I have seen columns much resembling 

 these. It must be widely distributed, as I have seen its columns on slabs of 

 Mountain limestone from Swaledale, in Yorkshire, and on slabs of transition 

 lime from Foulhope, the Malvern Hills, Gliddenhill, Shelly Island, Lake 

 Huron, in Canada, and Melville Island, in the arctic regions. Mr. PARKINSON, 

 who has seen the specimen in Mr. HAWKER'S collection, informs me that it is 

 illustrative of what he calls the Plumose Encrinite, and which was in Sir ASH- 

 TON LEVER'S collection. 



9. In the green sand formation, near Warminster, occur portions of a 

 Pentacrinite, (fig. 18.) with a rounded column, showing very little of the effects 

 of contraction in the interstices between the pentapetalous formations. These 

 columns display in some specimens an alternation of thicker and thinner joints, 

 and in others show a uniform thickness, the result of growth, as explained 

 before. At intervals larger joints are interposed, marked externally by five 

 transverse oblong depressions, from which round auxiliary side arms proceed. 

 I consider this a distinct species, to which I would assign the name 

 PENTACRINUS MONILIFORM is, from the bead-like shape of the interposed large 

 joints. 



10. Very minute Crinoidal auxiliary side arms no thicker than a hair, 

 occur with retepora, &c. on slabs of Mountain limestone, from Mitchel Dean, 

 (fig. 19.) They are excessively small, show but obscure marks of organization, 

 and are changed into spar. One specimen is bent into a hook. 



11. I understand Mr. JAMES SOWERBY, has found Crinoidal remains in the 

 London clay at Highgate, which I have not seen, and hence am unable to speak 

 to their generic and specific identity. 



12. In the slaty gray-wacke where it comes in contact with the lower beds 

 of the transition limestone, occur the impressions of numerous organic re- 

 mains and Crinoidea, the substance of which has been decomposed and removed. 

 It is perhaps owing to a contraction or compression of this slaty formation, that 

 the Crinoidal impressions thus found have generally an elliptical form. Where 



