REPORT ON THE OPHIUROIDEA. 277 



Astroschema rubrum, Lym. (PI. XXXIII. figs. 1-4). 



Astroschema rubrum, Lym., Bull. Mus. Comp. Zool., vol. vi., part 2, p. 68, pi. xvii. figs. 

 454-457, 1879. 



Arms, at bases, not cleanly arched, but somewhat angular. Mouth angles puffed so 

 as to nearly close the slits. Granulation fine, smooth, and close-set, six or seven in 

 1 mm. long. Tentacle scales short and scarcely club-ended. 



(Type specimen from Station 310.) Diameter of disk 12 mm. Length of arm 

 1G0 mm. Width of arm near disk 3"5 mm. Height of arm 3 - 5 mm. Mouth angles so 

 swollen as nearly to close the slits, and covered by a smooth granulation much obscured 

 by skin ; at the apex are small wide teeth. Arms near base as high as wide and not 

 cleanly rounded, but inclined to be angular, and showing distinctly the outlines of arm 

 joints ; tapering uniformly ; near their ends higher than wide ; covered by a close-set, 

 smooth, fine granulation, which, at bases of arms and on disk, has six or seven grains in 

 the length of 1 mm. Disk thick, but flat on top, and rising but little above arms, 

 covered by a thin skin, which is finely, closely, and evenly granulated. The radial 

 shields are faintly indicated by flat ridges running to the centre. Mouth tentacles 

 enclosed in tubes ; the next have no scale ; the next three or four have but one ; those 

 beyond, two, which at first are small and spiniform, and are nowhere long, the lower one 

 attaining a maximum length of 1*4 mm. with a cylindrical form, and a rough, scarcely 

 swollen end. Colour in alcohol, brownish-red, approaching flesh colour. 



Station 310.— January 10, 1876 ; lat. 51° 30' S., long. 74° 3' W. ; 400 fathoms ; mud ; 

 on a Gorgonian near Brandella. 



By its colour and smooth surface Astroschema rubrum may easfly be mistaken for an 

 Ophiocreas. 



Astroschema salix, Lym. (PL XXII. figs. 13-15). 



Astroschema salix, Lym., Bull. Mus. Comp. Zool., vol. vi., pt. 2, p. 66, pi. xvii. figs. 466-469, 1879. 



Granulation fine, even, and close set ; seven or eight grains in the length of 1 mm. 

 Disk flat, with ill-distinguished radial shields. . At tip of arm the lower tentacle scale 

 takes the form of a compound hook. 



(Type specimen from Station 170.) Diameter of disk 8 - 5 mm. Length of arm 

 85 mm. Width of arm near disk 3 mm. Height of arm 2 - 4 mm. Mouth angles 

 covered with minute, close, smooth granulation, and bearing at their apex the usual 

 wide spearhead-shaped teeth. Arms wide next disk, tapering rapidly for about 15 mm., 

 and thence very gradually to their tips ; covered by a fine, even, smooth, close-set 

 granulation, seven or eight grains in the length of 1 mm. The skin, being thin, allows 

 the outlines of the joints to show through, especially near the ends. Disk flat, scarcely 

 rising above arms, and with a similar granulation, though rather looser on the upper 

 surface. Radial shields scarcely to be distinguished, except at their outer ends. The 

 first pair of pores outside mouth slit has no scale ; the next six have only one ; those 



(zool. chall. exi\ — paet xiv. — 1882.) O 36 



