320 APPENDIX. 



(lifters from it " in its more robust and clumsy habit." 

 The chief peculiarity lies in the tentacles, which are short 

 and nearly of equal thickness throughout ; " and though 

 they are surmounted by a cluster of thread-cells, the 

 thread-cells are so few in number that the tentacles can 

 scarcely be termed capitate." 



The present species, according to Dr. Wright, is much 

 less hardy than S. decipiens. The latter will live for 

 several years in captivity, whereas S. ferox " seldom sur- 

 vives more than a few days after having been removed from 

 the sea." Dr. Wright does not give the number of ten- 

 tacles, nor does he tell us whether the gouophores are 

 clustered or not. It is not improbable that this species 

 may prove to be identical with the $. pulchella (Allman) . 



Hob. Firth of Forth. " It inhabits, generally, crannies 

 in large shells tenanted by Hermit-crabs, and rarely the 

 hollows of stones found in pools at extreme low-water 

 mark" (T. S. W.). 



Family Clavatellidse. 



Genus CLAVATELLA, Hincks. 



Prof. F. DE FILIPPI, of whose paper on Eleutheria I had 

 only seen a brief abstract when the account of this genus 

 was written, is very confident that one of the forms de- 

 scribed by Claparede under that name is specifically dis- 

 tinct from Clavatella prolifera. The mere variation in the 

 number of tentacles is not a point of any importance ; for 

 individuals agreeing in having six radiating canals have 

 been found with 8, 7, and 6 arms. But Claparede met 

 with specimens having only four radiating canals, and 

 Filippi says that this character is associated with a differ- 

 ence in general form and in some points of internal organi- 

 zation. If so, Claparede's zoophyte may be the sexual 

 zooid of another species ; but it would be satisfactory to 

 have the opportunity of examining the polypites before 

 coming to a decision. It is not a little remarkable that 



