Morphology o/Aiitedon rosacea. 35 



rical prefix*; but he never used this expression to denote 

 anything- else than the five chambers and their central axis 

 inside the central capsule ; while he further described and 

 figured the radial axial canals, the relations of which to 

 the coeliac canals of the rays and arms were subsequently 

 pointed out by myself. Their connection with the body- 

 cavity and their distinctness from the chambers of the so- 

 called heart were clearly recognized by Greeff, both in his 

 figures and in his descriptions ; while I am not aware that 

 Teuscher, the only other recent original writer on the subject 

 till the time of Jickeli and Perrierf, ever used the expression 

 " chambered organ " at all, though he often referred to the 

 '' Kammern des Gefasscentruras," and he recognized the con- 

 nection of the radial axial canals with the coeliac canals of the 

 rays. 



Messrs. Vogt and Yung, however, have figured not only 

 the cavities within the central capsule, but also the radial 

 axial canals, and the whole system of spaces within the calca- 

 reous network occupying the centre of the radial pentagon, 

 together with some accidental cavities within the solid base of 

 the centro-dorsal piece and in the radials, as " cavites de- 

 pendantes de la cavite g^nerale, et constituant dans leur en- 

 semble I'organe dit cloisonne "|. 



They say on p. 549, " Ce sont les espaces qu'on est con- 

 venu d'appeler, fort improprement, I'organe cloisonne ;" and 

 again on p. 530, " C'est la reunion de toutes ces excavations 

 internes, qui sont revetues de membranes, envoyant de cloi- 

 sons transversales et dessinant ainsi un systfeme compliqud de 

 lacunes cloisonn^es, qui composent ce que les auteurs ont 

 appele Vorgane cloisonn6 [Gekammertes Organ). C'est une 

 denomination eminemment impropre, vu que ce n'est pas uu 

 organe, mais une suite de cavites parcourues par I'organe 

 dorsal avec ses vaisseaux, et formant la continuation de la 

 cavite generale du corps, du coelome, qui entoure les intestins." 

 The statements contained in the first passage quoted above 

 and in the first paragraph of tlie second one are inaccurate, to 

 say the least of it. Messrs. Vogt and Yung do not name the 

 writers who have used the term "chambered organ" in this 

 very improper sense ; but it is certainly neither Dr. Carpenter, 

 Ludwig, Marshall, Greeff, Teuscher, J ickeli, nor myself; and 

 with the exception of Prof. Perrier^ I know of no other original 



* " Beitrfige zur Anatomie der Crinoideen," Zeitscbr. f. wiss. Zool. 

 1877, Bd. xxviii. pp. 315-32G. 



t So far as I can understaud Perrier's preliminary notes, he uses the 

 term " chambered organ " in its original sense, and not at all in that as- 

 signed to it by Vogt and Yung. 



t Op. cit. p. 550, fig. 270. 



3* 



