A MONOGRAPH OF THE EXISTING CRINOIDS 



85 



as broad as long. The distal edge of the transition segment is rather strongly pioduced 

 dorsally. On the following segments this production of the distal dorsal edge take the 

 form of a rather high transverse ridge with the crest flattened and dentate Distal y 

 this rid-e gradually narrows and on the last six segments before the penultimate it is 

 transformed into a low submedian dorsal tubercle. The opposing spine is small conical, 

 with the apex median or subterminal in position. The terminal c aw is about as long 

 aTthe penultimate segment or slightly longer, rather slender, and gently and evenly 

 curved The cirri increase slightly in width and thickness to the fourth or fifth segment 

 thTn decrease to the end of the transition segment, after which point they remain 



^'^The ends of the basal rays are visible as prominent and rather large rounded trian- 

 p-nlar tubercles in the angles of the calyx. 



" The radials are wholly concealed. The IBr, are chevron shaped, very narrow, with 

 paranoides, and are in close apposition In the median ^ ^^£™^ 

 sham keel or an elongate tubercle extendmg the entire length of the dorsal suriace. 

 The kteTal portions of the distal border may be unmodified, or they may be extended 

 ^ afly ov i the proximal portion of the axillanes in the form of a thin broadly scaUoped 



eThe IB* (axillaris) are broadly rhombic, twice as broad as long; the lateral 

 andes are only very slightly truncated. The dorsal surface may rise to a broad rounded 

 ImmenceTn the center with its maximum height in the proximal half or the proxima 

 V tiZ Tthe m d an line may be occupied by a broad longitudinally elongate tubercle 

 or a sharp melan keel. The HBr series are 2, resembling the IBr series, rather narrowly 

 ™twpx in the median line, but without central tubercles or keels. 



T^olZZe probably about 90 mm. long. They are very narrow at the base 



as tt ^^dorTlte where the distal border turns anteriorly and runs diagonally 



brachials so that conspicuous rhombic water pores are formed The second "™« 

 are from W„ to three times .s broad as long, in shape approximately oblong Th.tr 

 s, edger„e slightly prominent. The first sysygi,! p. ,r (composed «£%*£+» 

 is very sliebtly longer exteriorly than interiorly, usually about half again as ore 

 „n^ The liVPoWgal (third brachial) is oblong, with the dista border ^.*^«>» 



finlly SZESXS&Si ^^T*« - - 



