A MONOGRAPH OF THE EXISTING CRINOIDS 331 



This specimen stands out from the others in that there is no conspicuous contrast 

 between the proximal and more distal brachials in respect to conspicuous ornamentation. 

 The lower brachials are rather strongly saddle-shaped, but their dorsal surface is 

 smooth, and their distal ends are not beset with erect spines but are simply dentate 

 with sharp recumbent points. The arms are very slender and long. Long, slender, 

 and very flexible arms, according to Hartlaub, appear to be especially characteristic of 

 var. granulifera. 



The sequence of the syzygies agrees with that of the second specimen from Mar- 

 tinique, herein referred to var. gemmata (see page 319). On several arms the second 

 syzygy follows the first after a few brachials; for instance, on one arm it is between 

 brachials 6 + 7, on another between brachials 10 + 11. 



P D resembles the same pinnule in the smaller specimen from Montserrat (Blake 

 station 157) that Hartlaub referred to angusticalyx, (=var. angmta, p. 335). The 

 basal segments of the pinnules are broad, but from about the sixth onward they abruptly 

 become slender. 



Summarizing the significant features held in common by the six specimens that 

 he referred to granulifera, Hartlaub listed these as: The form of the centrodorsal; the 

 number and form of the cirri and of their segments; the occurrence exclusively or 

 mainly of IIBr 4(3+4) series; short segments in the division series and arms; the 

 position of the first brachial syzygy between brachials 1+2 in arms arising from a 

 IIBr series; cariuate proximal pinnules with short broad segments; and restriction of 

 the brachial ornamentation to the arm bases. 



The specimens referred to imbricata may be described as follows. The centrodor- 

 sal is hemispherical bearing 10 or 15 usually veiy definite columns of cirrus sockets; 

 the bare polar area is comparatively small. 



The cirri are XXV-XXX, 17-23 (usually about 20), from 25 to 30 mm. long, and 

 are comparatively slender. The first four segments are short, the fourth is about as 

 long as broad, and the remainder are about half again as long as broad; the distal 

 ends are somewhat prominent and overlap slightly dorsally. 



The ends of the basal rays are visible as rounded tubercles in the angles of the 

 calyx. 



The radials are concealed, or partially visible as small tubercles on either side of 

 the basal tubercles. The IBi'i are very short with the proximal border convex. The 

 IBrj (axillaries) are very broad and low, about three times as broad as long. The 

 IIBr series are 4(3 + 4) and are very short. The IIIBr series are 2(1+2), internally 

 developed in 1,2,2,1 order. The distal angles of all the axillaries are remarkably low. 

 The division series and first five brachials are in close lateral apposition and are sharply 

 flattened laterally. The outer side of each postradial series is separated slightly from 

 that of the postradial series adjoining by the prominent dorsal carination of P D , the 

 dorsal portion of P D being partially visible between the rays. 



There are 18-25 (usually about 20) arms about 160 mm. long. The arms are 

 slender and of approximately uniform width. The first four brachials are very short 

 and discoidnl; the next four or five are rectangular, those following becoming trian- 

 gular, about as long as broad, and remaining very uniform to the arm tips. The 

 edges of the elements of the division series and of the first four brachials are smooth, 



