PROCEEDIISIGS OF THE NATIONAL MUSEUM. 279 



the jaw nearly to the tips of the arms, and is not separated from the 

 adambulacral plates, with which they correspond in number, by any 

 papuhie. 



Each of the adambulacral plates bears a single small spine, situated 

 deep within and directly across the furrow, forming a single longitudi- 

 nal series, and also a transverse group, consisting of eight to twelve 

 round, blunt spinules, in two rows; the three inner ones are decidedly 

 longer and larger than the rest, the innermost odd one being the largest 

 of the three, and standing erect on the extreme inner angle of the plate, 

 and therefore nearly at right angles to the small spine within the 

 furrow. The outermost spinules of these groups are similar in size to 

 those of the adjacent ventral plates, from which they are separated by 

 a distinct continuous groove. The jaws are covered with numerous 

 erect spines, which are similar in size and form to those of the adam- 

 bulacral plates, but the adambulacral plate nearest the mouth bears a 

 group of small blunt spinules deep within the furrow. 

 Eastport, Me., m shallow water, 1870. (A. E. Verrill.) 

 This species is similar to ('. Hanguinolenta in form and general appear- 

 ance, though the dorsal surface is more uneven and papillose, owing 

 to the larger size of the pseudopaxilhi? and the more regular inter- 

 spaces; the pseudopaxilhTB are generally more in the form of rounded 

 fascicles, instead of regular comb- like groups. The differences are 

 much more marked on the ventral surfaces, where the three regular 

 rows of larger ventral jilates give a very different appearance to this 

 region, for in the former species the plates are scarcely distinguishable 

 in size, form, and spinulation from those of the lateral and dorsal j^lates 

 of the rays. The adambulacral and jaw-spines are also shorter and 

 more crowded than in the common form ; the papuhe are more regularly 

 arranged and not so numerous. 



Family AsteriiDvIS, Gray, 1840 (emended). 

 HYDRASTERIAS OPHIDION, Sladeu. 



Asterias {Eyilra^terias) ophidion, Sladen, Voyage of tlie ('halleuger, xxx, p. 581, 

 pi. 99, iigs. 6 and 4 ; pi. 103, figs. 3 and 4, 1889. 



A broken specimen was found at station 2573, in 1,742 fathoms. Its 

 structural characters appear to me to be worthy of generic rank. 



Family B r i s i n G i d ^, S a r s . 



ODINIA AMERICANA, Verrill. 



Brisinga americmia, Verrill, Amer. Journ. Sci., xix, p. 139, 1880; Rep. ComT. 



Fish and Fisheries, xi, p. 636, pi. 17, fig. 52. 1885. 

 Freyella americana, Sladen, Voyage ot the Challenger, xxx. pp. 616, 617, 834, 



1889. 



This large species is fui-nished with an abundance of long papuljc on 

 the swollen genital region of the rays, as stated in the original descrip- 

 tion. It belongs, therefore, to the genus Odinia. It is not easy to un- 



