280 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



wide, with deeply concave sides, on account of the huge tentacle pores, 

 which have no tentacle scales. Side arm plates low, each with three 

 subequal, cylindrical, blunt spines, a trifle longer than joint. Color 

 (dried from alcohol), disk brown; arms whitish. 



Locality. Albatross station 4888, Eastern Sea, lat. 32 26' N. ; long. 

 129 27' 30" E., 71 fathoms, dark gray sand, broken shells, bottom 

 temperature 59.7, 1 specimen. 



Type.Csit. No. 25619, U.S.N.M., from station 4888. 



This specimen is well preserved but I think it is immature and the 

 validity not only of the genus, but of the species as well, must remain 

 doubtful until further material is obtained. 



Family ASTROPHYTID^E. 



ASTEROPORPA HADRACANTHA, new species.a 



Disk 7 mm. in diameter; arms about 35 mm. long. Disk covered 

 with small unequal granules, among which some at center are largest; 

 in type, six primary plates are very obvious, but these are not usually 

 distinguishable with ease. Radial shields concealed but forming 



o o 



five conspicuous wedge-shaped divisions of disk, upon which double 

 parallel series, of smooth and hook-bearing granules alternate; gran- 

 ules between wedges smooth. Upper surface of arms covered like 

 radial wedges by alternating series of smooth and hook-bearing 

 granules; although the bands of smooth granules are really decidedly 

 wider than those of hook-bearing granules, the latter seem wider 

 because the most distal and most proximal row of smooth granules 

 form an elevated border to the hook-bearing bands which are thus set 

 above and made more conspicuous than the smooth ones. Inter- 

 brachial spaces below large, covered, as is all of oral surface, by a pave- 

 ment of granules. Genital slits small, oblique but approaching vertical. 

 Teeth and tooth papillre longer and more slender than oral papillae, 

 which are few, short, and pointed. Under surface of arms paved 

 with granules. First pair of tentacle pores of arm, small, unprotected ; 

 succeeding pores protected by a ridge carrying tentacle scales or 

 arm spines. Second pore has two or three such scales, third three 

 or four, and succeeding pores five or six such spinelets; they are 

 short and thick, lowest particularly so and about as thick as long, 

 thorny with glassy points at tip. Color (dried from alcohol), very 

 light brown or nearly white. 



Localities. Albatross station 3727, off Omai Zaki, Honshu Island, 

 Japan, 34 fathoms, mud, coarse sand, broken shells, 2 specimens; 



a 'Adpoc, signifying stout, and aKavOa, signifying spine, in reference to the short, 

 thick arm spines. As Orstedt and Liitken's original spelling, " Aster opor pa," 

 is philologically correct, it ought to be used rather than the contracted form, " Astro- 

 par pa," 



