vol. 



ygY''] PROCEEDINGS OF THE NATIONAI. MUSEUM. 137 



strong ridge, formed principally of uiesoglcea, projects, and as tlie 

 capitulum is approached cavities appe;ir in the ridge, giving it in cross- 

 section a club-shaped outline. 



The capitulum is apparently very short and is destitute of any in- 

 vestment. The number of the tentacles 1 could not asceitain, but they 

 seem to be few, perhaps eight, almost certainly not more than sixteen. 

 They project down into the stomatodteum in the manner described by 

 Quatrefages ('41). 



The stomatodieum is short and is slung by the eight mesenteries, whose 

 musculature has the usual arrangement. All the mesenteries are gouo- 

 phoric and possess mesenterial tilanients. Since Andres ('80) has stated 

 thatin U. Claparedii the respiratory portions of the filament are wanting, 

 I may state that in the species here described they are unmistakeably 

 present, though short. The bases of the mesenteries at their insertion 

 into the column wall are furinshed with pinnately arranged muscle })roc-' 

 esses (PI. XIX, Fig. 3 h m). The longitudinal muscles are strong, resem- 

 bling in transverse section those of ^. tectn as tigured l)y Haddon (''"^O). 



It is impossible to identify this form with any of the si)ecies that 

 have been described. Within recent years a number of Edwardsias 

 from deep water have been described by Moseley (77), Marion (\S!i), 

 E. llertwig ('8S), and Danielssen ('90), but the <lescriptions are not in 

 all cases sufficiently detailed to pennit of a correct idea of the mor- 

 phological characteristics. The structural features which are of im- 

 portance for classiticatory purposes seem to be the tubeicles, the shape 

 of tlie longitudinal and basal muscles of the mesenteries, the presence 

 or absence of longitudinal ridges on the column, and, what is ])rol>ably 

 of less importance, the number and arrangement of the tentacles. 



E. intermedia agrees, as already stated, with A', tecta (Haddon, '<S9) 

 in the structure of the longitudinal m.uscles, but differs from it in pos- 

 sessing tubercles and in the shape of the basal muscles of the mesen- 

 teries; it approximates E. fiisca Danielssen ('90) in the number of the 

 tubercles, though they are not arranged with anything like the regu- 

 larity which they have in Danielssen's figure, and in addition the shape 

 of the longitudinal nuiscles is altogether diflerent ; it ]escml)les E. car- 

 nea (Haddon, '89) in the ])Ossession of longitudinal ridges on the 

 capitulum and upper part of the sca])us, but differs froiu it altogether 

 in the shape of both longitudinal and basal muscles. 



In consequence of its ])0ssessing certain of the characteristics of each 

 of these three species I have named the foini heiv described E. inter- 

 medUt. 



Tribe PROTACTINIiE. 



Anthozoa with twelve i)rimary mesenteries, of which eight at least 

 are perfect, and which are arranged in pairs, the longitudinal mesenter- 

 ies of each pair being on the faces of the mesenteries which are turned 



