1915.] NATURAL SCIENCES OF PHILADELPHIA. 53 



till the adradial one is distinctly clavate and is about twice as long 

 as the correspondin'^ arm joint. The color is light pinkish brown 

 in alcohol. The type specimen is 16 mm. in disk diameter, 230 mm. 

 in arm length and 4.5 mm. in arm width at base. 



Two specimens; Okinose (a submarine bank), Sagami Sea. One 

 specimen; Sagami Sea. 



Asterosohema glaucum Matsumoto. 



1911, Dobuts. Z. Tokyo, 23, p. 617 (in Japanese). 



This species is near A. salix Lyman, but differs from it in coarser 

 granules on disk and arm bases, in stouter arm bases, in much shorter 

 arm spines, and in oral tentacles being enclosed in tubes. About 

 six granules lie in 1 mm. on the radial ribs and free arm bases. Arms 

 very stout at base, as high as wide. Arm spines longer and stouter 

 outwards, till the adradial one is somewhat clavate and is slightly 

 longer than the corresponding arm joint. Oral tentacles enclosed in 

 tubes. First two or three tentacle pores also provided with tubes, 

 though rudimentary. The color is pale gray in alcohol. The type 

 specimen is 11 mm. in disk diameter, 100 mm. in arm length and 

 4' mm. in arm width at base. 



Three specimens; Sagami Sea; 110 fathoms. 



Asterosohema hemigymnum Matsumoto. 



1912, Dobuts. Z. Tokyo, 24, p. 381 (in Japanese) ; fig.s. 3, 4. 



Diameter of disk 10 mm. Length of arms 120 mm. Width of 

 arms at base 3 mm. Disk rather flat, divided into ten lobes, cor- 

 responding to the radial ribs, by ten radiating furrows; covered by 

 a skin, which contains very fine, smooth, close-set granules. Ventral 

 interbrachial areas rather vertical, narrow, forming a deep notch, 

 on the floor of which opens one madreporic pore. Genital slits 

 rather short, more or less divergent dorsally. Ventral surface of 

 disk covered by a finely and rather sparsely granulated skin. 



Oral angles not markedly set off from the outer parts. Six or 

 seven teeth arranged in a single vertical row, triangular, very stout. 

 On either side of the oral angles, there are several coarse, flat, smooth, 

 pavement-like grains, which correspond to oral papillae. 



Arms very stout for the first three or four free joints, but becoming 

 rather slender further out; their width just outside the fourth free 

 joint is 2.5 mm. They constantly taper outwards, so that they are 

 exceedingly slender towards the extremities, which are very acute. 

 Dorsal and lateral surface of the arms covered by a skin, which is 

 similar to that of the disk, containing very fine, smooth, close-set 



