78 Clarh — New Recent Crinoids from the Indian Ocean. 



Disk completely covered with a pavement of rather small rounded 

 plates, those in the angjles of the calyx hetween the division series hearing 

 conical processes in their centers; this calcareous covering is not closely 

 united to the perisonie heneath, except along the amhulacra, but draws 

 away from it in drying; amhulacra with side and covering plates highly 

 developed. 



Ends of the basal rays visible as small, though prominent, tubercles in 

 the angles of the calyx ; radials even with the centro-dorsal, but over the 

 ends of the basal rays extending upward in a narrow slightly wedge- 

 shaped (base upward) process, which terminates distally in a spatulate 

 process between the lateral edges of the i Bra; i Bn short, slightly trape- 

 zoidal, not in contact basally, about four times as broad as long, rather 

 strongly convex dorsally, with a rather prominent narrow rounded 

 median ridge; i Brs (axillary) i)eiitagonal, nearly or quite twice as broad 

 as long, the lateral edges slightly shorter than those of the i Bn, making 

 with them an obtuse angle, with a narrow rounded median ridge similar 

 to that on the i Bri in the proximal half; ii Br 2, with the rounded 

 median ridge much less ))rominent than on the i Br series. 



Twenty arms about 12U mm. long; first brachial small, wedge-shaped, 

 twice as broad as long exteriorly, almost entirely united interiorly ; 

 second brachial considerably larger, irregularly quadrate, botli usually 

 with a slight trace of a rounded median keel; third and fourth brachials 

 (syzygial pair) oblong, half again as broad as long; next four lirachials 

 oblong, twice as broad as long, with a low tubercle in the proximal half 

 of the median line; following two or three l)rachials wedge-shaped, the 

 following triangular, about as long as broad ; arm tips not preserved. 

 On the lower i)art of the arm traces of tubercles are found on alternate 

 sides of the median line; the proximal third of the arm is somewhat com- 

 pressed laterally, and bears on either side a shallow lateral groove. The 

 arms increase slowly in diameter up to about the twelfth brachial ; from 

 the fourth onward the brachials have moderately i)rojecting finely spinous 

 distal edges. Syzygies occur between the third and fourth brachials, 

 again between the eighteenth and nineteenth (rarely the seventeenth and 

 eighteenth or twentieth and twenty-first), and distally at intervals of four 

 to nine (usually six to eight) oblique nuiscular articulations. 



Pi 8 mm. long, slender and weak, with twenty joints, the first broad, 

 slightly wedge-shai)ed, al)out twice as broad as the length of its proxinuil 

 edge, produced distally into a high rounded carinate process ; second 

 joint longer, half again as broad as long, bearing a large fan-shaped cari- 

 nate process with a scalloped or dentate distal edge ; third and fourth 

 considerably less in diameter than the second, slightly longer than broad, 

 with strong oblong carinate pnjcesses ; following joints non-carinate, 

 slowly increasing in length, becoming twice as long as broad in the 

 terminal portion ; after the second joint the i)innule is rather shari)ly 

 triangular; in the distal half the joints jjroject somewhat over the bases 

 of the succeeding joints at the angles of the prism, this increasing toward 

 the tip where the ends of the joints overlap all around and are more or 

 less spinous; I'.- 14 mm. lung, slender, but slid', with twi'uty-one joints; 



