no. 1636. ARM HOMOLOGIES IN RECENT CRINOIDS— CLARK. l%\ 



Included species : 



Hypalocrinus naresianus (P. II. Carpenter). 



Genus ISOCRINUS, L. Agassiz, 1836. 



Genotype. — Isocrinus pendulus von Meyer, 1837. 



Subgenus CENOCRINUS Wyville Thomson, 1864. 



Genotype. — Encrinus caput-medusce Lamarck, 181C (=/,ns asteria 

 Linnaeus, 1766). 



Geographical distribution. — Caribbean Sea and Gulf of Mexico. 

 Depth.— SO (?) to 320 fathoms. 

 Included species : 



Isocrinus (Cenocrinus) asteria (Linnaeus). 



Subgenus ISOCRINUS L. Agassiz. 



Geographical distribution. — Caribbean Sea and Gulf of Mexico. 



Depth. — 07 to 667 fathoms. 



Included species: 

 Isocrinus (Isocrinus) blakei (P. H. Carpenter). 

 Isocrinus (Isocrinus) decorus (Wyville Thomson ) . n 



Genus ENDOXOCRINUS, new genus. 



Genotype. — Encrinus parrce Gervais, is:').") (=Pentacrinus mulleri 

 ("hsted, 185G). 



Geographical distribution. — West Indies and Gulf of Mexico, At- 

 lantic coasts of southern Europe and northwest Africa (including 

 the outlying islands), and East Indies to Timor, the Philippines, the 

 Kermadec, and the Meangis Islands. 



Depth.— -20 to 1,095 fathoms. 



Included species: 



^Endoxocrinus alternicirrus (P. H. Endoxocrinus sibogw (DMerlein). 



Carpenter). Endoxocrinus wyville-thomsoni (Wy- 



Endoxocrinus parrw ((iervais).'' ville-Thomson). 



a Also many fossil species. 



b Pentacrinus mulleri 5rsted is a synonym of this species: /'. maclearanus 

 Wyville Thomson is merely a rather strongly marked variety. 



