Morphology o/'Antedon rosacea. 33 



tation ^tant donnde, telle que nous I'avons indiquee, nous 

 allons esquisser la situation gdnerale des organes dans le 

 calice, dans le but de faciliter a I'eleve rintelligence de Fana- 

 tomie de la Comatule singuli^rement difficile a debrouiller. 

 Les coupes dans difFdrents sens constituant les principaux 

 Elements de la dissection, nous avons indiqud, dans les figures 

 264 a 268, representant trois coupes horizontales et deux ver- 

 ticales du calice, les ni ernes objets par des cliifFres identi- 

 ques." Here are some instances of the way in which this 

 most desirable object is effected : — c, in fig. 264, denotes the 

 " muscles transversaux internes," i. e. those by which the 

 first radials are " fusionnes " to one another laterally ; while 

 in fig. 268 it is appended to the paired muscular bundles by 

 which the first and second radials are articulated together. 

 In figs. 264 and 268 a denotes the first radials, while in 

 fig. 267 these are marked a^, and the centro-dorsal is denoted 

 by a. In fig. 264 the figure e is appended to the " anneau pen- 

 tagonal du syst^me nerveux central" which lies within the 

 substance of the first radials on the ventral side of the rosette 

 and altogether outside the inner cavity of the centro-dorsal ; 

 but in fig. 267 e denotes the dorsal portion of the central capsule 

 or nervous envelope of the chambered organ, which is situated 

 at the very bottom of the centro-dorsal cavity in its deepest 

 part. Do the authors really mean to imply that this is " le 

 m^me objet" as the pentagonal commissure within the 

 radials ? It would seem so ; for they refer to it as the 

 '' anneau nerveux central," and in fig. 276 they mark the 

 same part g, with the explanation " anneau central du syst^me 

 nerveux." But they speak of it two pages before (p. 548) 

 as " sous la forme d'un disque pentagonal a angles arrondis, 

 percd au centre d'une petite rosette pentagonale aussi, et par- 

 courue pardescloisons membraneuses etoilees, qui se rdunissent 

 au centre." The result of this indiscriminate application of 

 the term "anneau" to the discoidal nervous centre within 

 the centro-dorsal and to the pentagonal commissure within the 

 radials cannot but be most perplexing to the student ; and it 

 was the less excusable since every one of these different mus- 

 cular and nervous structures, which have been confused by 

 Messrs. Vogt and Yung, were clearly differentiated by myself 

 and distinguished by different letters in the explanations of 

 my figures as long ago as 1879, in a memoir quoted in their 

 Bibliography. 



The authors also seem to be altogether unaware, though the 

 fact has been known for the last twenty years, that each radial 

 receives two nerve-cords which enter it separately by large 

 and well-defined openings. They find, as their predecessors 



Ann. & Mag. N. Hist. iSer. 5. Vol. xix. 3 



