CLASSIFICATION OF ACTINIARIA 287 



vesicles ; narrower and devoid of vesicles above, thus having a smooth 

 extensile capitulum. The capituluni has a tentaculate margin, and both 

 it and the long tentacles are retractile. The latter have little stinging 

 spots on them, and moreover each has a sphincter at its base, as in 

 Bolocera, so that it is deciduous. The vesicles may be simple and 

 sphaeroidal or compound, sessile or stalked, and have nematocysts in 

 at least parts of their ectoderm. Tentacular longitudinal muscle ecto- 

 dermal. There is ectodermal longitudinal muscle in body-wall and 

 actinopharynx, and there are no siphonoglyphes : but the mesenterial 

 filaments have ciliated tracts as usual. Sphincter absent or weak diffuse. 

 Number of perfect mesenteries variable, about four to twenty pairs, 

 the irregularity probably connected with fission and laceration as modes 

 of reproduction. Retractors diffuse. Tissues delicate. Habitat, weeds, 

 stones, &c. 



Species : 



B. strumosa, Andres, 1880, p. 315. (See Duerden, 1897 and 



1902, ' Trans. Linn. Soc.') 

 B. antilliensis, Duerden. 1897, p. 7 ; 1902, ' Trans, Linn. Soc' 

 B. globulifera, Verr., 'Trans. Connect. Acad.', x, p. 559. 



(See Duerden, 1902.) 

 ?B. australis, Haddon, 1898, p. 435. 



B. australis may not really be a Buiiodeopsis ; 

 its anatomy is unknown and it has only a single circle of vesicles 

 near the base, and does not seem quite like the others. V i a t r i x 

 globulifera, D. and M., is perhaps the same as B . globuli- 

 fera. 



Thaumactis, Fowler, 1889, ]). 148. 



Phyllactidae probably. Only described species a small form flattened 

 like a disc, with the mouth in the middle of the upper side ; perhaps 

 free-swimming. The column has irregularly arranged simple or slightly 

 compomid vesicles. There are a few marginal tentacles, with ecto- 

 dermal longitudinal musculature. Body-wall and actinopharynx have 

 ectodermal longitudinal musculature. No siphonoglyphes. Weak 

 diffuse sphincter. Mesenteries not numerous, with weak musculature. 



Species : 



T. meduaioides, Fowler, 1889, p. 143. 



Lbbrunia, D. and M., 1860. 



Probably Hoplophoria as used by Wilson, 1890, p. 379, 

 for H. coralligens, not as used by Haddon, 1898, 

 p. 438, for H. cincta. 



