NARRATIVE OF THE CRUISE. 387 



small number ; and the minute pedicellariae of the peristome arc much fewer. The 

 ovaries, which in Cidaris papillata have the walls loaded with large expanded calcareous 

 plates, contain only a few small branched spicules ; and the calcareous bodies in the wall 

 of the intestine are small and distant. The perforations in the ovarial plates in the 

 female are somewhat larger than in Cidaris papillata ; and the ripe ova in the ovary- 

 appear to be considerably larger. 



" The eggs, after escaping from the ovary, are passed along on the surface of the test 

 towards the mouth ; and the smaller slightly spatulate primary spines which are articu- 

 lated to about the first three rows of tubercles round the peristome, are bent inwards over 



Fig. 142. — Goniocidaris canaliculala (Cidaris nidrix, Wyv. Thorns.). Balfour Bay, Kerguelen Island. Natural size. 



the mouth, so as to form a kind of open tent, in which the young are developed directly 

 from the egg without undergoing any metamorphosis, until they have attained a diameter 

 of about 2 "5 mm.; they are then entirely covered with plates, and are provided with 

 spines exceeding in length the diameter of the test. Even before they have attained 

 this size and development, the more mature or more active of a brood may be seen stray- 

 ing away beyond the limits of the ' nursery,' and creeping with the aid of their first few 

 pairs of tentacular feet out upon the long spines of their mother ; I have frequently 

 watched them return again after a short ramble into the ' marsupium.' 



"I am not aware that a free pseudembryo, or ' pluteus,' has been observed in any 

 species of the restricted family Cidaridte ; but I feel very certain that Cidaris papillata 



