and Species of Crinoidea. 201 



A. crassus, Austin, sp. 

 The plates surrounding the body agree with the typical cha- 

 racter in number and arrangement, but they are comparatively 

 broader and devoid of the radiated markings. Rays numerous, 

 but their number unknown. Column unascertained. 



A. granulatus, Austin, sp. 



Def — The perisomic plates agree in number with the ge- 

 neric type. The first series of plates are larger in proportion 

 to the size than in the typical species ; the upper series are 

 also broader. The plates covering the portion above the rays 

 are finely granulated, excepting the six plates surrounding the 

 valvate anal pore, which are smooth. Mouth not quite central, 

 but situated below the large dome-shaped plate which crowns 

 the centre. Total number of rays unknown, but they were 

 probably numerous, as indicated by their points of attachment 

 to the body. Columnar articulation large and circular. Column 

 unknown. 



This is a highly interesting specimen as showing the val- 

 vate anus, and is supposed to be unique in that respect. 



A, Itfvissimus, Austin, sp. 

 Def. — Body-plates answer to the typical character in num- 

 ber and arrangement, but they are comparatively larger than 

 in any other known species. The first and second series are 

 flat and smooth, the remainder are slightly rounded, and have 

 faint and partial radiations. Plates covering the viscera fur- 

 nished with conical projections in their centres. Divisions of 

 the rays fifty, closely tentaculated. Column as in other spe- 

 cies, varying at different periods of growth. 



A. longispinosus, Austin, sp. 

 Def — The plates surrounding the body agree with the ge- 

 neric type, but the radiations are less strongly marked. The 

 coronal plates, or those protecting the upper portion, are elon- 

 gated into spines of very great length. Oral tube long and 

 covered with minute plates. Rays forty. Column varying 

 at different seasons. 



Genus Rhodocrinites, Miller. 

 This is another genus of Miller's which requires an emended 

 definition. He describes the dorso-central plates (pelvis) as 

 composed of three instead of five pieces, and the first series 

 of plates resting on them as quadrilateral, when, in fact, they 

 are hexagonal. These mistakes were no doubt owing to the 

 smallness of the specimens examined by Miller, which ren- 

 dered them liable to be misunderstood. In consequence of 



