172 PROCEEDINGS OF THE NATIONAL 2IUSEUM. vol.41. 



The specimen from Tawi Tawi agrees with C. multijida in having 

 true synarthries between the ossicles of the outer division series ; but 

 it differs markedly in the scheme of arm division, and in its larger 

 and permanent cirri. It is probably most nearly allied to C. delicata, 

 but represents a very distinct new species, which may be described 

 as follows : 



COMASTER TAVIANA, new species. 

 Phanogenia carpenteri A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 392. 



Desc7'iption.—CentTodorsal discoidal, broad, the polar area flat, 

 5 mm. in diameter; cirrus sockets arranged in a single crowded, 

 somewhat irregular, marginal row. 



Cirri XX-XXII, 16-18, moderately slender, 13 mm. to 15 mm. 

 long; first two segments about twice as broad as long, third slightl}" 

 longer than broad, fourth — seventh or eighth half again as long as 

 broad, the following gradually decreasing in length, the terminal 

 seven or eight being about one-third again as broad as long; ninth a tran- 

 sition segment, rounded in cross section and with a dull surface like 

 the preceding in the proximal three-fourths, polished like the suc- 

 ceeding in the distal fourth; following the transition segment the 

 segments become rather strongly compressed laterally, so that in a 

 lateral view the cirrus appears to thicken from this point onward; 

 transition and following segments with the distal dorsal edge pro- 

 duced, tliis production rapidly becoming more sharply rounded, and 

 soon ^-shaped, the segments at the same time becoming distally 

 more carmate dorsally, so that the later segments are provided with 

 a small but sharp subterminal tubercle; in addition, the segments 

 from the eleventh or twelfth onward have, just before their middle, 

 a second, more rounded median dorsal tubercle, not quite so high as 

 that in the distal portion, presenting, therefore, the same appearance 

 as the cirrus segments of Oligometra adeonse; opposing spine repre- 

 sented by a small median tubercle arising from the entire dorsal 

 surface of the penultimate segment, the apex usually forming in 

 lateral view slightly more than a right angle, though occasionally 

 more sharp; terminal claw somewhat longer than the penultimate 

 segment, stout basally but becoming more slender distally, moderately 

 curved. 



Ends of the basal rays visible as small tubercles in the angles of the 

 calyx; radials only slightly visible in the angles of the calyx, over the 

 ends of the basal rays; IBr^ very short and broad, more or less (some- 

 times wholly) concealed by the centrodorsal, just in contact basally 

 but diverging distally; IBrg broadly pentagonal, almost triangular, 

 twice as broad as long, or even sQmewhat broader; IIBr 4 (3 + 4); 

 IIIBr 2; IVBr 2, but irregular in occurrence; division series free 

 laterall}^ though not widely separated, rounded dorsally, but not 

 especially convex. 



