310 Mr. J. Hitchie on a 



Encrinus, Blumenbacli, 1779. 



(1) asteria. 



(2) mylii (or radiatus) (type of Umhellularia^ Lamarck, 



1801). 



(3) holtenii {ox ouifer) (type of Boltenia, Savigny, 1816). 



It may, perhaps, be mentioned that Oken'suse of Encrinus 

 ('Lehrbuch der Naturgeschiclite/ 1815, iii. p. 110) for 

 Blumenbach's second species only does not enter into the 

 question at all, for tliat species liad, fourteen years before, 

 become tlie type of Lamarck's Umhelluliria. 



Since the type of Ejicrinus is the Isis asferia of Linnaeus, 

 this involves considerable change in the nomenclature of the 

 recent stalked Crinoids. The species of MetacrinuSy Eudoxo- 

 crinus, and Hypalocrinus remain as previously understood 

 (see Proc. Biol. Soc. "Washington, xxi. pp. 151, 152) ; the 

 other species of the recent Pentacrinitidse, asteria^ decorus, 

 and hlahei^ falling into two groups which cannot be separated 

 more than subgenerically, must be treated as follows : — 



Genus Encrinus, Blumenbach, 1779. 

 (Genotype. — Isis asteria, Linnaeus, 1766.) 



Subgenus Encrintjs, Blumenbach. 

 Encrinus {Encrinus) asteria (Linnaeus). 



Subgenus Isoceintjs, L. Agassiz, 1836. 



(Genotype. — Isocrinus pendulus, von Meyer, 1837.) 



Encrinus {Isocrinus) hiakei (P. H. Carpenter). 

 Encrinus {Isocrinus) decorus (Wyville Thomson). 



XL. — Note on a rare Plumularian Hydroid^ Cladocarpus 

 formosus. By James Eitchie, M.A., B.Sc, Natural 

 History Department, the Royal Scottish Museum. 



In 1874 Allman described, under the name Cladocarpus 

 formosus, several hydroid specimens obtained by the 



