OPHIOGLYPIIA SARSIT. 43 



Avitli very fine, flattened, close-set papilla^, wliieh grow suddenly much 

 larger as tliev pass upwards along edge of radial scale ; whole number 

 about Ibrty ; longest ones on radial sca.les havin«j: a leno-th of .0"""- 

 Papilhii running along sides of l^asal upper arm-plates very small ; they 

 start at the inner side of second ])lafe, and run to outer side of fourth 

 plate, there being about four papilhi) to each plate ; outermost ])apilla3 

 largest. Arm-spines smooth, rounded, tajiering, sharp ; second joint, 

 two spines, lengths to that of under arm-plate, .4, .8:1; third joint, 

 three spines. A, .8, 1.2 : 1 ; all the rest of tiie joints have exactly three 

 spmes, except close to tip of arm ; fifth joint, 1.6, 1.6, 1.2 : 1 ; about two 

 thirds out on arm, 1, 1, 1 : .4 ; close to tip of arm, middle spine longest, 

 and equal to a little over half the length of the joint ; other two spines 

 about equal. Tentacle-scales at base of 



1 Fk' 3. 



arm flat and square, and rounded at the 

 corners ; in sha])e much like some of the 

 side mouth-papilla} ; mouth tentacles sur- 

 rounded by a crown of scales, arranged 

 close together in an oval, usually nine on 

 the side next the moutli-shields, and five 

 on the other side ; sometimes, however, 

 seven on one side and six on the other ; 

 second joint, six scales, three without, and '^^ ^ ^^ 



.... - -.,.. „ Opliioglyphii S;irsii. (Lower side.) 



three witiun the tentacle; tlnrd jomt, lour a, 10^x1- arm-i.iate , f, io«cr part of side 



- . . - • 1 • /> 1 arm-plate. 



scales, two without and two withm ; fourth 



joint and those just beyond, three scales, two within the tentacle, and 

 one lying between it and middle line of arm ; farther out, the last 

 mentioned scale and the one next to it grow smaller and smaller, and 

 finally disappear about three fifths out on the arm, while the third scale 

 maintains its size, and is found quite to the tip of the arm, where it 

 becomes pointed and spear-like. Color, m alcohol : uniform dirty white, 

 or very faint brown ; disk above, and chewing apparatus below, a shade 

 darker ; color, when dry, chalky white. 



Variations. — A young one has the following characters : diameter 

 of disk, 3.7""" ; length of arms, Q""""'. Mouth-papillae, three on each side, 

 and one at the inner apex of the mouth angle ; outer one broadest. 

 First under arm-plate largest of all ; plates immediately beyond it small, 

 their length being less than that of the line of juncture of the side ann- 

 plates below. Side arm-plates not meeting above till half way out on 

 the arm. Upper arm-plates proportionatel}^ longer than in the adult ; 

 two of them are included by the notch in the disk. Arm-spines three ; 

 two upper ones nearly as long as ann-;oints ; lowest one much shorter. 

 There are eleven papilla?, in a close row, along the radial scales and 

 genital slits. The mouth-tentacles have two scales on the side next the 



