406 BihliograpMcal Notieas. 



"superne" should read " inferne " in the explanation of it. 

 This is at once evident from the fact that there are no ambu- 

 lacral grooves visible upon the skeleton of the arms, such as 

 are shown in the representations of the same species ( Crota~ 

 locrhnis pulcher) on tab. viii. figs. 6 and 7. The calyx is 

 broken across near tlie level of the tops of the basals, so that 

 the internal faces of the radials and the following plates are 

 exposed to view, with the remarkable striations upon them 

 which were regarded by Angelin as corresponding to the 

 consolidating apparatus of Cupressocrinus. It is possible 

 that, like this structure, they may represent an uneven sur- 

 face for the attachment of muscles and ligaments ; but what- 

 ever else they may be, the striae are certainly not hydrospire- 

 slits, as supposed by Wachsmuth and Springer in 1879. 

 They appear to have still held this view even as late as last 

 year, when they published the first section of the third part 

 of the ' Revision,' for we find a reference to the presence of 

 hydrospires in Crotnlocrinus on p. 64, and on p. 83 this is 

 extended into the following generalization : — " The Crotalo- 

 crinicU\3 have no anambulacrai pieces, but possess hydrospires 

 within the calyx." 



There is no mention of these hydrospires, however, in the 

 subsequent definitions either of Grotalocrinus or of Enallo- 

 crinus in the second section of this part which has just 

 appeared ; and it is possible therefore that the authors have 

 already given up their belief in the presence of these organs 

 in the Crotalocrinidce. But in any case they will no longer 

 be able to refer to this family as Palaiocrinoids which " pro- 

 bably have hydrospires within the calyx " *, and to use this 

 supposed fact as an illustration of their theory that Blastoids, 

 Cystids, and Crinoids are so closely linked together that they 

 are not entitled to rank as Classes of Echinoderms equivalent 

 to the Urchins and Starfishes. This point, however, is fully 

 discussed elsewhere f. 



BIBLIOGRAPHICAL NOTICES. 



Bevision of the Palceocrinoidea. — Part III. Discussion of the Classiji- 



cation and lielations of the Brachiate Crinoids, and Conclusion of 



the Generic Descriptions. By Charles Wachsmuth and Pkank 



Springer. Second Section. Extracted from the ' Proceedings of 



the Academy of Natural Sciences/ March 30, 1886. Philadelphia, 



1886. Pp.'lOo. 



We are very glad to welcome the second and concluding section 



of the Eevision of the Palseocrinoidea, Part III., by Messrs. Wachs- 



* ' Revision,' part iii. p. 76. 



f ' Catalos'ue of the Blastoidea in the Geological Department of the 

 British Museum (Natural History) " (London, 188G), pp. 113-121. 



