A MONOGRAPH OF THE EXISTING CRINOIDS 23 



Antedon vicaria Bell, 1894, is not recognizable from the description; although 

 described in the "Spinifera group" it is in reality a member of the "Palmata group." 



Carpenterocrinus A. H. Clark, 1908, is listed, with the genotype Pentacrinus 

 mollis P. H. Carpenter, 1884. 



Catoptometra A. H. Clark, 1908, is hsted, with the genotype Antedon hartlaubi 

 A. H. Clark, 1907. 



The type of Comatula Lamarck, 1816, is determined as C. Solaris. 



The anomalous figure of Comatula adeonae published by de Blainville is identified 

 as a copy of the figure given by Audouin to illustrate his Comatula multiradiata from 

 the Red Sea which was later called savignii by Miiller. 



CyUometra belli A. H. Clark, 1907, is not necessary; Antedon loveni Bell, 1884 

 (not A. loveni Bell, 1882) for which the name was proposed is the same as Antedon 

 insignis Bell, 1882; CyUometra belli therefore becomes a synonym of Antedon insignis. 



Encrinus Andreae, 1763, is listed with the genotype E. coralloides, sp. nov., which 

 appears to be the same as Pentacrinites fossiUs Blumenbach, 1804. 



Himerometra helianthus A. H. Clark, 1907, nomen nudum, refers to H. heliaster 

 A. H. Clark, 1908. 



The genotype of Metacrinus P. H. Carpenter, 1882, is determined as M. wyvilUi 

 P. H. Carpenter, 1884. 



In view of the abundance of Metacrinus superbus off southwestern Japan it is 

 suggested that the type of this species may have come from somewhere in the 

 Japanese region. 



Pentacrinus balfouri Wyville Thomson, MS. = P. naresianus P. H. Carpenter, 

 1882. 



The type of Pterocrinus P. H. Carpenter, 1884, is determined as Bathycrinus 

 australis A. H. Clark, 1907. 



The results of a study of the axial canals in Isocrinus decerns, Endoxocrinus 

 parrae and Metacrinus rotundus were published on October 30. 



Fifteen specimens of Isocrinus decorus were dissected, and infrabasals were found 

 in every case. Five specimens of Metacrinus rotundus and one of M. superbus were 

 dissected, and infrabasals were found in all si.x. Three specimens of Endoxocrinus 

 parrae were dissected, and in all three infrabasals were absent. So far as can be 

 judged from Carpenter's figures they are also absent in E. vyyvillethomsoni and E. 

 alternicirrus. It is possible, therefore, that Endoxocrinus constantly differs from 

 Isocrinus and Metacrinus in the absence (through resorption when very j^oung) of 

 the infrabasals. This was suggested in the original diagnosis of the genus Endoxo- 

 crinus published on June 9. 



The species of which the a.xial canals were described and figured by Reichensper- 

 ger is shown to be Endoxocrinus parrae instead of Isocrinus decorus. 



The column of a very young Isocrinus decorus is described and figured. The 

 columnals are bourgueticrinoid in character and the articular faces consist of two 

 ligament fossae separated by a median fulcral ridge running along the longer a.xis of 

 the oval joint face. 



In a paper published on October 30 the homologies of the postradial ossicles in 

 the recent comatulids and pentacrinites and in Uintacrinus are discussed in great 



