ADELOCRINUS. 223 



V. Family PLATYCEINID^, F. Romer, 1855. 

 1. Genus PLATYCRINUS, /. 8. Miller, 1821. 

 1. PLATYCRINUS ? ANGULIFERUS, n. sp. Plate XXXVII, figs. 8 12. 



Description. Cup probably elongate. Basal disc nearly horizontal? Radials 

 large, upright, suboblong, higher than wide, with a low excavation above, and 

 ornamented by two or three central perpendicular ridges, from which four or five 

 horizontal ridges start to the sides. Second primibrach axillary. Arms uniserial, 

 with very low alternating cuneate plates (not quite reaching the sides), very long 

 and moderately slender, sending out branches some distance up, and bearing 

 close-set pinnules. Some small interradials on the shoulders of the radials. 



Size. Radials 8 or 10 mm. high. 



Localities. A crushed specimen from Saunton Hotel, consisting of parts of 

 four radials with arms attached, is in Mr. Coomara Swamy's Collection; three 

 detached radials from Top Orchard, Roborough, and Pilton are in the Porter 

 Collection; and one from Ashhill Quarry and another from Croyde are in my 

 Collection. A detached columnar of a Platycrinus from Vicarage Lane, Pilton, in 

 the Barnstaple Athenaeum, may perhaps belong to this species. 



Remarks. These specimens appear to be the remains of a fine species, the 

 full characters of which cannot at present be ascertained. I have long been 

 acquainted with the scattered plates, which are very similar in shape to those of 

 Platycrinus or Hexacrinus, and are curiously ornamented with strong ridges 

 which do not radiate, but form a succession of right angles on their surface. 

 Recently Mr. Swamy has lent me a specimen showing part of the cup and arms, 

 but these are unfortunately somewhat obscured by crushing. I have not 

 observed any anal plate among the specimens, and though it is possible that one 

 may have existed in the cup, it seems rather more probable that it was wanting. 

 If it is a Platycrinus it is quite possible that the highly nodulate segment of a 

 Platycrinus stem in the Barnstaple Athenaeum may have belonged to it. 



VI. Family HEXACRINIDJ:, Wachsmuth and Springer, 1885. 



1. Genus ADELOCUINUS, Phillips, 1841. 



So little appears to be known about the single species on which Phillips 

 founded it, that the validity of this genus must remain for the present entirely 

 in doubt. It has of late been sometimes treated as a synonym of Platycrinus. 



