328 Miscellaneous, 



rufescens and Chiridota Pisanii*) the genital canals themselves 

 become receptacles for the brood, and the entire development is 

 passed through within them. The oldest stages of the young, 

 which throng the genital canals in large numbers, are 3 millim. in 

 length and are born through the genital aperture. They possess 

 seven tentacles, exhibiting the same symmetrical arrangement as 

 iu the case of the young of Chiridota rotifera previously described 

 by me. In their body-wall the wheel-papillae t and the hook-shaped 

 calcareous bodies, which are especially characteristic of the species 

 and to the function of which Ostergren + has recently directed 

 attention, are already well-developed ; similarly the tentacles also 

 are already provided with the same calcareous bodies as in the case 

 of the adults. Among internal organs may be observed the calca- 

 reous ring, a ventral Polian vesicle, and a dorsal uncalcified stone- 

 canal, as well as a typically coiled intestinal canal. The young 

 lie sometimes with the anterior, sometimes with the posterior end 

 towards the genital aperture. 



In a younger stage the young are scarcely 1 millim. in length 

 and possess but five tentacles ; in the integument it is only in the 

 three dorsal interradii that groups of wheels occur, one group in 

 each close behind the tentacles and a second a short distance in 

 front of the anus; the rudiments of the hook-shaped calcareous 

 bodies of the integument, as well as of the calcareous rods in the 

 tentacles, have only just begun to appear. 



I shall endeavour to give a precise descriptiou of the young 

 stages here alluded to of Chiridota contorta, which is now found to 

 be viviparous, in my memoir upon the antarctic Holothurians 

 collected by Dr. Michaelsen. I shall there also have an opportunity 

 of clearing up the synonymy of the antarctic Synaptidse (especially 

 of Chiridota purpurea, Lesson, which has been misinterpreted by 

 Studer as well as by Theel and Lampert), and, with reference to the 

 antarctic (hermaphrodite !) Cuciimaria crocea, which takes care of 

 its brood, of giving a detailed account of the young forms, a large 

 series of which I have at my disposal. — Zooloyischer Anzeiger, 

 Bd. XX. No. 534 (June 28, 181)7), pp. 217-219. 



* As to this, I have already published a note in my treatise on sea- 

 cucumbers in Bronn's ' Classen und Orduungen,' p. 182, so that Deudy is 

 in error in asserting, as he has just done, that he is the first to discover a 

 separation of the sexes in a Ckiridut.a {Ch. dunedinensis, Parker). — Cf. 

 Dendy " Observations on the Holothurians of New Zealand, with 

 Descriptions of four new Species, and an Appendix on the Development 

 of the Wheels in Chirodota," Journ. Linn. Soc, Zcol. vol. xxvi. 1897, 



p. 28. 



t The development of the wheels agrees perfectly with the account 

 which 1 gave in 1892 of the origin and structure of C/tiridota-'wheels in 

 general (Zeitschr. f. wiss. Zool.' Bd. liv. pp. 3o0-364, t. xvi.). Dendy 

 needs only to look at this paper, which he has left entirely unnoticed, in 

 order to convince himself that it contains everything that he recently 

 communicated as new concerning the mode of formation of Chiridota- 

 wheels {cf. Dendy, he. cit. pp. 49-50). 



X Zool. Anz. 1897, p. 154. 



