STAURIDIUM PRODUCTUM. 00 



After a time, the investing sac is ruptured by the fre- 

 quent and vigorous movements of the gonozooid, and the 

 involved portion of the disk, bearing the tentacles, is slowly 

 forced out. In a case which came under my observation, 

 half the margin, with two tentacles, was first pushed out ; 

 after a few more violent spasms the other half followed ; 

 and almost immediately the little crystal sphere, with its 

 rose-coloured pendant and four rose-coloured tubercles, 

 from which as many beaded arms depended, liberated 

 itself and moved gracefully through the water. 



The Sarsia turricula of Prof. M'Crady's paper on " the 

 Gymnophthahnata of Charleston Harbour" (Proc. of Elliott 

 Soc. of Nat. Hist. vol. i. 138, pi. viii. figs. 6-8) appears 

 to be identical with the gonozooid of S. productum. His 

 account, however, of the Coryne from which he supposed 

 it to proceed does not enable me to determine the species 

 with certainty. 



The arms of the Stauridium, as of the Athecata generally, 

 increase in number with the age of the polypite. The 

 young are found with only two, three, or four of the capi- 

 tate tentacles, placed a little below the oral aperture; 

 after a time the second verticil is developed, and then the 

 third. The row of false tentacles seems to be produced 

 contemporaneously with the first series of capitate arms. 

 The Coryne Cerberus of Gosse is founded on an immature 

 specimen of the present species. 



Hal. Caroline Park, near Edinburgh, on Phutiularia 

 fulcata (T. S. W.): Ilfracombe, in rock-pools on the Cap- 

 stone, very abundant (T. H.). 



Family VII. Clavatellidae. 



POLYPITES with a single verticil of capitate tentacula ftur- 

 roundiny the base of the proboscis. GONOZOOIDS 

 ambulatory. 



