148 Clark — New Recent Indian Crinoids. 



Centro-dorsal conical, the sides slightly convex, 8 mm. broad at the base 

 and 2 mm. high, the cirrus sockets arranged in ten eolnmns of nsnally two 

 eacli, the pairs of columns usually slightly separated radially by a shallow 

 furrow or a coarsely tubercidar ridge. 



Cirri xx, 62-71, elongated and very slender, 50 mm. long, the longest 

 joints being twice as long as broad, or slightly longer, those after about 

 the twenty-lifth being slightly broader than lung ; joints after the seven- 

 teenth or twentieth with the distal dorsal edge produced into a serrate 

 ridge which soon gives place to small carinate dorsal spines. 



Ends of the basal rays visiV)le as small, thougli rather prominent, tuber- 

 cles in the angles of the calyx ; radials just visil)le or entirely concealed, 

 sometimes bearing on the dorsal surface a row of small tul lercles ; i Rn very 

 short, widely chevron-shaped, the proximal and outer third of the distal 

 edge somewhat everted and the distal lateral angles more or less produced ; 

 I Bra (axillary) triangular, twice as broad as long, the anterior edges 

 somewhat everted, the lateral angles more or less iJrodnced; ir Br 4 {?> + 

 4), developed in two out of six specimens, the lateral edges of the compo- 

 nent joints more or less produced. 



Ten to thirteen arms SO mm. to 90 nun. long, exceedingly slendt^r, hav- 

 ing in general more the appearance of those of some slender antedonid 

 than of those of a thalassometrid ; first brachial short, wedge-shaped, twice 

 as long exteriorly as interiorly, basally united interiorly, tlie anterior 

 and posterior edges slightly thickened, the lateral edges somewhat pro- 

 duced, and the antero-lateral angles, both interior and exterior, more or 

 less produced ; second brachial similar in size and shape ; third and fourth 

 brachials (syzygial pair) usually slightly longer interiorly than exteriorly, 

 half again as broad as, to about as broad as, long; next three or four 

 brachials approximately oblong, twice as broad as long, then becoming 

 triangular, as long as broad, distally slowly increasing in length and 

 becoming wedge-shaped, being twice as long as broad in the outer part of 

 the arm ; synarthrial tubercles rather prominent ; i Br series and lirst two 

 brachials smooth dorsally or with a few small low incons])icnous tul}ercles, 

 usually with slightly spinous lateral borders ; following i)racliials with the 

 dorsal surface studded with very tine short s])ines or sharp tubercles, 

 which in some specimens are nearly obsolete; at about the end of the 

 proximal fourth of the arm the brachials begin to develoi) j^rominent longi- 

 tudinal striations which increase in fre(|uency and height distally. The 

 proximal oblong brachials have the pro.xinial and distal ends somewhat 

 prominent; after about the twentieth brachial the distal edgt's begin to 

 overlap, and in the distal portion of the arm the brachials have the ilistal 

 portion somewhat ex])anded, giving approximately thesame " dice-box " 

 appearance characteristic of the terminal i)ortion of the arms in the Ante- 

 donidfe. 



The jiinnules are essentially as in other species of the genus ; but the first 

 three i)inindes on each side of the arm nn' very strongly carinate. 



