﻿OPHIOLEPIS GAllRETTI. 6X 



Ophiolepis Garretti Lyman. (P1. ii. fig. 4.) 



Special 3Iarks. — Arms six times tlic diameter of the disk, not 

 tapering till just at the end ; mouth-shields as broad as long. 



Description of a Specimen. — Diameter of disk, 9""°- ; width of arm, 

 "without spines, 2'""* ; length of arm, SS"""'. Mouth-papilliB, five on each 

 side, and one under the teeth, those on the sides flat, stout, squarish, 

 crowded ; the outer one sends a slender prolongation above and beside 

 the next papilla. Teeth regular, broader than long, with a rounded 

 cutting edge. Mouth-shields neatly rounded without, and with an acute 

 angle within ; length to breadth, .9:1; their outer edge is bordered by 

 a Hue of little, crowded, angular pieces, one of which is inserted between 

 the mouth-shield and side mouth-shield, at each corner. Side mouth- 

 shields large, of equal width along their length ; within separated by 

 one or two supplementary pieces. Under arm-plates longer than broad, 

 broader without than within ; outer side curved, lateral sides re-enter- 

 ingly curved; length to breadth (seventh plate), .9 :.7. Side arm-plates 

 thick and swelled. Upper arm-plates broader than long, broader with- 

 out than within, swelled ; length to breadth (ninth plate), .5 : 1.3. The 

 supplementary pieces are small and crowded, the one at each outer 

 corner being largest ; they are at the base of the arm, from seven to 

 ten. The scaling of the disk is very regular, the scales being a little 

 smaller below than above ; diameter of the largest nearly 1°""- ; each 

 has its free edge bordered by a line of crowded and regular pieces, 

 which are commonly about seven in number. Eadial shields irregular 

 oval, separated by two large scales, one outside the other, and two 

 smaller ones lying side by side. Arm-spines four, very small and slen- 

 der, confined to the middle of the edge of the side arm-plate ; lowest 

 one longest, .S""" long. Tentacle-scales two, rarely three, stout, thick, 

 forming together an oval figure, which stands obliquely to the length 

 of the arm. Color, in alcohol : disk, pale reddish-yellow, with bands of 

 darker on the arms ; below, grayish. The living animal has a brick- 

 red disk, with paler bands on the arms ; the lower surface much paler 

 (Garrett). 



This species is distinguished from 0. cincta by shorter mouth-shields ^ 

 and much longer arms. The best distinguishing mark, however, is the '^^ 

 microscopic appearance of granulation which the upper arm-plates have, ^r 

 while m 0. cincta they are smooth and glossy. 



