PODOCORYNE CARNEA. 29 



The first set of marginal tentacles consists of four, which 

 arc placed at the termination of the radiating canals. 

 The subsequent increase takes place by fours, the largest 

 number thus far observed in any species being 16. 



Podocoryne rivals Hydr actinia in the variety of form 

 that exists amongst its zooids. The degeneration of the 

 fertile polypites is never so complete as in the latter genus, 

 and, indeed, in some cases it has no existence at all. I 

 have shown that the spiral and filamentary appendages 

 are common to both. There is a close relationship between 

 the two genera. 



1. P. CARNEA, Sars. 



PODOCORYNA CARNEA, Sars, Faun. Litt. Norv. part i. 4, t. i. figs. 7-18. 



ALBIDA, Sars, ibid. 7. 



PODOCORYNE CARNEA, Allman, Ann. N. H. for July 1859 and May 1864 ; 

 Hincks, Rep. Brit. Assoc. for 1864, (Proc. of Sect.) 99. 



Plate V. 



POLYPITES tall, expanding slightly upwards, white or red- 

 dish, with an opake-white proboscis, and a variable 

 number (4-30) of long and graceful tentacles, rising from 

 an iiicmsting base, thickly covered (in the adult state) 

 with smooth linear spines; GONOPHOHES borne in clusters 

 on the body of the polypites *, a little below the base of 

 the tentacles, pedunculate, containing each a single 

 medusiform zooid. 



GONOZOOID. UMBRELLA deep bell-shaped, thickly covered 

 with minute thread-cells, and with a wide velum ; MANU- 

 BRIUM short, reddish, with a tuft of large, vibratile 

 thread-cells on each lobe of the mouth; MARGINAL TEN- 

 TACLES eight, very extensile, springing from red bulbs, 

 four fully developed at the time of liberation, and four 

 more or less rudimentary. 



* The fertile polypites are generally, but not universally, smaller than 

 the alimentary, and furnished with fewer tentacles (4-5). 



