THE BAENACLES IN THE U. S. NATIONAL MUSEUM. 97 



exceed one-third the length of the occludent, and is somewhat nar- 

 rower, tapering- to a bhint end. It joins the upright portion in a short 

 curve. The occludent branch is nearh' parallel-sided, but is a trifle 

 wider in the middle. The summit or tergal border is oblique, close to 

 the tergum. 



The tergum is triangular, with the umbo on the carinal side, mid- 

 wa3^ between the summit of the plate and the apex of the carina. A 

 furrow runs from the umbo to the baso-occludent angle, opposite the 

 apex of the scutum, where there is a slight notch. The occludent 

 margin is convex ; summit somewhat obtuse. The basal and carinal 

 margins are nearly straight, the basal angle of the plate somewhat 

 obtuse. 



The carina is very strongly arched basall}^, less so toward the upper 

 end. The roof is flat, and at the upper end as wnde as the plate, taper- 

 ing to a narrow keel at the base. The sides are broader than the roof, 

 but taper upward. The base forms a broadly crescentic cup. half 

 embracing the top of the peduncle, but the horns of the crescent are 

 very short (lig. 3o/>, basal view). 



The peduncle is very short, attached to the axis of a slender hydroid. 



Length of the capitulum of the type, 8 mm. ; width, 3.6 mm. Length 

 of capitulum of No. 11860, 11 mm.; breadth, 5.7 mm. 



This species is based upon two specimens, one of them. No. 11860, 

 being evidently a quite old individual in which the carina is wider (tig. 

 d?>d). It is related to Dlchelaspis sessile Hoek from oft' the Azores in 

 1,000 fathoms, but in that the scutum is decidedly broader. Octolasmis 

 luncalense is an allied form, in which the curve joining the two branches 

 of the scutum is longer. (Figs. 33.) 



OCTOLASMIS HAWAIENSE (Pilsbry). 



1907. Dichelaspis hawaiensis FiusBRY, Bulletin of the Bureau of Fisheries, XXVI, 

 p. 184, pi. IV, fig. 5. 



Localities.— Cat l<^o. 32893, U.S.N.M., .-lZ?>a^/w.'^ Station 3810, off 

 the south coast of Oahu, 211-253 fathoms; also No. 32894, Albatross 

 Station 4081, off Puniawa Point, Maui, 202-220 fathoms. 



The capitulum is strongly compressed, about twice as long as wide, 

 with nearl}' straight occludent and convex carinal margin. 



The scutum is boomerang shaped, forming a narrow band along 

 the occludent margin and another obliquely across the base, the two 

 straight portions being united by a curve. The occludent portion is 

 slightly wider than the lateral, obliqueh' beveled above to a point, 

 which is received in a notch of the tergum. The lateral portion is 

 about half the length of the occludent, and extends more than half way 

 across the side, above the incurved base of the carina. 



The tergum is subtriangular in general outline. Its occludent mar- 

 4715— Bull. 60—07 7 



