A MONOGRAPH OF THE EXISTING CRINOIDS 83 



PARAMETRA LISA, sp. noT. 



Diagnostic Jeatures.-The arms beyond the proximal more or less oblong brachials 

 are distinctly carinate; and the cirri, which are arranged in 10 columns on the centro- 

 dorsafand are about one-quarter of the arm length with 25-26 segments, have th 

 trltion segment the eighth, and the distal segments as long as b-^£ v<^ smaH 

 and obscure dorsal processes. The 19 arms are 115 mm. long, and the cirri are 20 -8 



mm 'D?slription -The centrodorsal is low, conical, with a low rounded conical dorsal 

 pole The Sus sockets are arranged in 10 columns of usually two each here ,bemg 

 ?wo columns in each radial area. The columns are m close contact mterradxally, bat 

 are slightly separated in the mid-radial lines. 



The cirri are XXI, 25-26, from 20 to 28 mm. in length, and rather slender The 

 first leimn "very short, the second is about twice as broad as long, the third is 

 subtly broader than long/the fourth is about one-third again as long as broad and 

 hose following graduallylncrease in length to the eighth, a transition segment ,hich 

 is between two and one-half and three times as long as its least width ihe segments 

 foUoW Gradually decrease in length so that the last 15 or 16 are about as long as 

 SrXS l portion of the cirri tapers slightly and slowly to the transition 

 segment The °ZJ% the transition segment converge very slightly to ^ beginning 

 nf%^e distal third then diverge to the end. Beyond the transition segment the cirri 

 ^m'ofle^me^dth to the tip. On the *^.^££%Xm 

 median portion of the distal border dorsally is roughened or armed with exceedingly 

 fine sphfes On the succeeding segments it becomes slight y produced and also nar- 

 ^wed!Ie profile of the outer portion of the cirri being slightly serrat. . dc^ The 

 processes almost disappear on the antepenultuna to segment. The P™f™™ q = 

 ment is usually a truncated cone, with no trace of an opposing spin. The t emu . 

 claw is about as long as the penultimate segment; it tapers gradually to a sharp ■?> 



in contact with those of their neighbors. ^7™^^*%^; Lies and 



elevated line which continues a sixmlar median hne on the IBi, The UBr 



IIIBr series (when present) resemble the IBr series. The mnei borders 



and of the first brachials may be slightly "«*£■ fc oue on each pos f, 



r T^ ^ ^ouTof^e iSr'sX fj « " £K& AD the dnision 

 l£! rt iTer^ n^row! Inconspicuous, bu« always distinct, cannato hue 



runs along the middorsal line of the arms to then- tips. 



