196 Messrs. Austin on new Genera 



posed list of Crinoidea, which appeared in No. 63 of the c An- 

 nals and Magazine of Natural History ' ; but as this term 

 came within the objection pointed out by the British Asso- 

 ciation, we have not hesitated in proposing one less objec- 

 tionable, and perhaps more characteristic. 



P. radiatus, Austin, sp. 



Def. — Dorso-central plates (pelvis) much elongated, with 

 several highly raised narrow ridges which run across the su- 

 tures, and uniting with similar ridges on the adjoining plates 

 form series of triangles around the body. Ray-bearing plates 

 broad, with nearly circular excavations for the insertion of the 

 rays. Column and rays unknown. 



P. rostratus, Austin, sp. 



Def.— The plates forming the cup of this species are iden- 

 tical in number and arrangement with the generic type. The 

 upper portion is elongated into a proboscis or oral tube, 

 situated centrally, of considerable length, and covered with 

 plates which are ornamented with reticulating ridges. The 

 proboscis terminates at its apex with several tooth-like plates. 

 Main rays five, once subdivided, making ten. Tentacula 

 somewhat distant from each other. Column composed of 

 large and small joints alternately. 



P. quinquangularis, Austin, sp. 



Def. — Dorso-central plates more conical than in the generic 

 type. Proboscis elongated, with elevated ridges crossing the 

 plates transversely. Main rays five, with one or more subdi- 

 visions. Column quinquangular near its attachment to the 

 body, but gradually becoming circular as it recedes from that 

 point. 



P. plicatus, Austin, sp. 



Def. — Form and arrangement of the body-plates coincide 

 with the generic type. Five broad, elevated, strongly defined 

 ridges or folds run upwards from the dorso-central plates, 

 through the first series of perisomic plates : when near the 

 upper edges of these plates the ridges divide and branch out- 

 wards at an angle of about 45°, terminating at the base of the 

 rays, and forming a figure approaching to the letter Y. A 

 similar ridge then crosses from each horn of the letter, and 

 terminates also at the base of the rays. Rays unknown, but 

 their points of attachment are nearly circular, with a central 

 ridge. Column circular, slightly enlarging at its attachment 

 to the dorso-central plates. 



