284 T. A, STEPHENSON 



P . r a d i a t a , D. and M. , 1 86( ). ( Sec McMu vvidi , 1 905. ) 

 P . c a 1 i f o !• 11 i a , MeM. , 1 89;i, p. ] 96. 

 And probably otherw. 



1 have done the best i can with tliis genus, but the synonyniy 

 of its species is a matter for special study. I think McMurrich 

 has made it clear that Phyllactis is identical with Qu- 

 ia ctis, Asteractis, and Lophactis — probably also with 

 Actinostella, iti which case the latter name would have 

 priority ; but until more is known of the type, A. formosa, 

 it seems better to keep to the well-known Phyllactis. 

 P . striata, Wass. , seems more like a C r a d a c t i s . 



Ckadactis, McM., 1H98. ]>. 11)7. 

 Saccactis, Lager, 1911, p. 220. 



Phyllactidae in which the column has veirucac, usually in vciticai 

 rows, to which foreign bodies may adhere. At the margin there are 

 vesicles in a ring — probably jnoditied and developed acrorhagi ; they 

 vary in fonn, the uppermost at least being somewhat lobed or branched 

 or foliose, and there may be concentrations of nematocysts on them ; 

 when these ' fronds ' are at their best development they may form 

 a wide frill round the animal. Sphincter cUfTuse or circumscribed, 

 usually well developed. Longitudinal musculature of tentacles ecto- 

 dermal. Retractors usually strong, diffuse to circumscribed diffuse. 

 Gonads may or may not appear from the first cycle onwards. 

 Species : 



C. digit a ta, McM., 1893, p. 198. 



C. plicatus, Hutton, 1878. (See Stuckey, 1909, p. 392.) 



C. magna, Stuckey, 1909, p. 394. 



C. mcmurrichi, Lager, 1911, p. 220. 



C. australis, Lager, 1911, p. 223. 



C. musculosa. Lager, 1911, p. 223. 



C. excels a, Wass., 1908, p. 23. 



? C. striata, Wass., 1908, p. 22. 



I have joined this genus and Saccactis because I cannot 

 find any very serviceable distinction between them, and I think 

 any variation there may be in the form of the vesicles and their 

 continuity with the row^s of verrucae probably finds a parallel 

 in Bunodactis, as do also the variability of nematocysts 

 in the fronds and the variations of the sphincter. Cr a da ctis 



