the Moy-phology of the Echinoderms. 101 



extends, not more tlian half of one and one third of another 

 are concerned with a notice of the Report * on the Stalked 

 Crinoids dredged by the ' Challenger ' and the ' Blake.' The 

 remainder of the article is almost entirely devoted to (1) an 

 exposition of the views which Prof. Perrier holds respecting 

 the circulatory apparatus of the Echinoderms in general and 

 of the Crinoids in particular ; (2) a new primary classification 

 of the Metazoa ; (3) a list of the genera of recent " Encrines " ; 

 and (4) a list of the species in the Paris Museum of Natural 

 History. 



I propose to say a few words upon each of these heads, 

 with the exception of the second, to which I would direct the 

 attention of those zoologists who are interested in questions 

 of general classification. 



Prof, Perrier regrets that with the material at ray disposal 

 I did not enter more fully into " une histoire anatomique des 

 Encrines vivantes " f. At the commencement of chapter vi. 

 of the * Challenger ' Report, which contains 42 pages devoted 

 to the minute anatomy of the disc and arms, I stated expressly 

 that I did not propose to devote so much attention to this 

 subject as 1 had done to the comparative morphology of the 

 Crinoid skeleton ; for I had been " able to confirm, in almost 

 every respect, the admirable investigations of Ludwig % ^^ 

 the minute anatomy of Antedon rosacea^ It did not appear 

 to me to be necessary to go into the whole question again 

 from the beginning, and I therefore limited myself to a 

 general account of the anatomy of the soft parts as far as 

 I have been able to work it out in six genera of Stalked 

 Crinoids and in three Comatulce. In addition to this, I 

 entered into a considerable amount of anatomical detail 

 when discussing the generic affinities of Tthizocrinus and 

 Bathycrinus. But, unfortunately. Professor Perrier tells us 

 that many of Ludwig's results, and therefore, by implication, 

 of mine too, are erroneous. This is doubtless only too true, 

 and I am anxiously awaiting Prof. Perrier's promised demon- 

 stration of the fact. 



Owing to the circumstances of the case, the material at my 

 disposal had not been specially prepared for minute anato- 

 mical work, having been in spirit for many years without any 

 previous hardening ; while, on the other hand. Prof. Perrier's 

 observations have been carried out on a constant supply of 

 fresh material "with all the advantages of an elaborate 



* Zool. Chall. Exp. part xxxii. 

 t Loc. cit. p. 693. 



X " Beitrage zur Auatomie der Orinoideeu/' ZeitscLr. f. wiss. Zool. 

 1877, Band xxviii. pp. 255-353, Taf. xii.-xix. 



