196 Messrs. Austin on new Genera 



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

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

 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-hke plates. 

 Main rays five, once subdivided, making ten. Tentacula 

 somewhat distant from each other. Column composed of 

 large and small joints alternately. 



P. quinquaiigularis, 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 ic recedes from that 

 point. 



P. plicatus, Austin, sp. 



DeJ". — 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, 

 throvigh 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. 



