Stephenson — Certain Actiniaria collected off Ireland. 123 



Carlgr. A. Oarlgreni differs in various small ways from A. atrostoma — it, has 

 a different sphincter, stronger tentacle-musculature, and other differences — 

 see Wassilieff 1908. Carlgren gives no figures of A. intermedia (10), but 

 judging from his description, and from comparison with his figures of other 

 species to which he refers, it would seem that the sphincter, disc- radial- 

 musculature, etc., present numerous slight but sufficient differences; more- 

 over, in A. intermedia, the longitudinal musculature of the tentacles is 

 better developed in the outer basal parts than in the inner. This is exactly 

 the opposite in A. atrostoma. 



Sub-family PARACTINAE 1 Carlgren. 



Paractidae in which the two mesenteries of one and the same pair, in 

 the younger cycles, are either equally developed, or, if any inequality occurs 

 it shows considerable irregularity, or does not follow the Actimostola-rvXe 

 exactly. 



Cymbactis 1 McMurrich. 

 Paractinae with thick smooth body-wall, without verrucae, collar, cuticle, 

 or true capitular ridges (though the upper part of the column may be thrown, 

 in strong contraction, into ridge-like folds). Margin tentaculate, not lobed. 

 Tentacles simple or somewhat thickened at the base, in more than two cycles, 

 their longitudinal musculature mesogloeal. Sphincter simple. More than 

 six pairs of mesenteries perfect. Tennons diffuse. 



I have been obliged to extend this definition even more than before, to 

 include the rather curious form described below. 



9. C. Gossei, n. sp. 

 (PI. XIV, figs. 10, 11 ; PI. XVII, figs. 5, 9, 14.) 



SR. 335. May 12, 1906. Lat. N. 51° 12' 30" - 51° 17' 30"; Long. 

 W. 12° IS' - 12° 10'. Trawl. 893-673 fathoms. 1 specimen (with several 

 Actinernus aurclia). 



Measurements. — Diameter of mouth of basal cavity, 3 - 6 cm.; of column, 

 6 - -j cm. at greatest ; height of specimen (contracted), ca. 5 - 5 cm. Depth of 

 basal cavity, ca. - 7 cm. 



External characters. — The body is almost spherical, having the appearance 

 of an apple with a broad base, the tentacles and upper part of the body being 

 completely introverted. The body-wall is thick throughout, and of bard and 

 firm texture. At the limbus it becomes much thinner, and the edge of the 



1 See foot-note <>n p. 1 18. 



[B 2] 



