196 THE ATLANTIC. [chap. iv. 



enormously lai'ge in proportion to the other appendages of the 

 perisom. Ahnost simultaneously with the first appearance of 

 the j)rimary spines, ten tentacular feet, apparently the first 

 pairs on each ambulacrum of the corona, just beyond the edge 

 of the peristome, come into play ; they are very delicate and 

 extremely extensile, with well-defined sucking-disks ; and with 

 these the young cling to and move over the spines of the moth- 

 er, and cling to the sides of the glass vessel, if they are dis- 

 lodged from the marsupium. This species seems to acquire its 

 full size during a single season. We dredged it at the close of 

 the breeding season, and we took no specimens intermediate in 

 size between the adult and the young. 



Among the marine animals which we dredged from the 

 steam-pinnace on the 19th of January, ISTi, at de]3ths of from 

 50 to 70 fathoms in Balfour Bay (a fine recess of one of the 

 many channels which separate the forelands and islands at the 

 head of Royal Sound, Kerguelen Island), there were several 

 examples of a small Cidarls, which I will name provisionally 

 C nutrix (Fig. 42). 



This species resembles C.jpajpillata in the general form and 

 arrangement of the plates of the corona, in the form and ar- 

 rangement of the primary tubercles of the inter - ambulacral 

 areas and of the secondary tubercles over the general surface 

 of the test, in the form of the plates of the apical disk and of 

 the imbricated calcareous scales of the peristome, in the form, 

 sculpture, and proportionate length of the primary spines, and 

 in the form of the different elements of the jaw-pyramid and 

 in that of the teeth ; but the test is more depressed, the second- 

 ary spines which articulate to the ambulacral plates and cover 

 the pore - areas are longer and more cylindrical, not so much 

 flattened as they are in C.papillata ; the large tulip-like pedi- 

 cellarise and the long thin tridactyle pedicellarise mixed with 

 the secondary spines in the northern species are wanting, or in 

 very small number ; and the minute pedicellarise of the peri- 



