86 ART. 1. — I. IJIMA : HËXACTINELLIDA, III. 



«.—Body cup-like; or, the principals of hexasterous discohexasters (of both types) much 



longer than the terminals C. pipetta F. E. £cH. (Antarctic Ocean). 



b. — Body fungiform, with the ga?tral surface outwardly exposed ; or, the principals of hex- 

 asterous discohexasters (of both types) nearly equal to or shorter tlian the terminals. 

 «'. — Gastralia are predominantly pentactinic pinnies; or pachydiscohexasters represented 

 by hexactinose forms only. 



a". — Pinular ray of dermalia mostly ovuid; or, the slender pinular ray of gastralia 

 nearly 1 mm. or more in length ; or the terminal tuft of lophodiscohexasler 

 nearly as long as the principal ; or, the unpaired radial ray of hypodermalia and 



hypogastralia echinated throughout nearly the entire length 



C. latus F. E. ScH. (South Indian Ocean). 



b". — Pinular ray of dermalia slender and sharply pointed at apex ; or, the slender 

 pinular ray of gastralia less than i nun. in length ; or, the terminal tuft of 

 lophodiscohexaster 3-4 times longer than the principal ; or, the unpaired radial 

 ray, as also other raj's, of hypodermalia and hypogastralia echinated at base.... 



O. ayasaizl F. E. ScH. (Atlantic Ocean). 



i^ — Gastralia are hexaclinic pinnies ; or, pachydiscohexasters represented by hexasterous, 

 hemihexactinose and hexactinose forms. 



c^.— The unpaired radial ray of hypodermalia and hypogastralia echinated through- 

 out ; or, pachydiscohexasters over loOiJ. in diameter 



C. ek(jms F. E. ScH. (North Pacific Ocean). 



d". — The unpaired radial ray of hypodermalia and hypogastralia smooth, being 

 rough-surfaced only at the end; or, pachydiscohexasters under 115 [j. in 

 diameter. Lophodiscohexaster not present C lotifoUum Ij. (Sagami Sea\ 



Besides the five species ""' embodied in the above, a case of 

 undeterminable Caulophacus from off the coast of Maryland is men- 

 tioned in F. E. Schulz'es " Amerikanische Hexactinelhden " ('gg, 

 p. 39). The specimen consisted of only the stalk and the basal 

 disc, but the hexactinic pinular dermalia and the nature of the 

 hexasters found in it attest the correctness of the generic identifi- 

 cation. As to the completely macerated pieces of tubular stalk 

 from the Antarctic mentioned by Topsent ('oi) as Qmlophacus 

 sp., nothing can be said except that that writer was perfectly 

 justified in attaching a query to the name. 



* The specimen from the Antarctic, on which F. E. Schulze based his Pleorhabdus 

 oviformis (Chall. Eep., p. 121 and P. S.) is evidently a Caulophacid. Were it not for 

 the fict that that genus and species was withdrawn from the system by the original 

 descrlber ('97), I might have regarded Pleoihahdm, on the strength of the description 

 and figures given in tlie Cliall. Rep., as identical with Caulophacus and thus added a 

 sixth species to the list; but as the matter now stands, it has to be entirely left out 

 of consideration. 



