﻿MARINE ASELLOTE ISOPODS MENZIES 



139 



in the relative lengths of the first and second antennal segments (com- 

 pare diagnoses of the two subspecies) . 



Ecology. — Ecologically the two differ considerably. /. k. kincaidi 

 is found in small pools on the surface of rocks where the water is 

 supplied by w'ave splash and is subject to extremes in temperature. 

 /. k. derjiigini, on the other hand, is found under rocks in the middle 

 and lower intertidal zones, often on and under rocks covered by the 

 algae Laminaiia and Egregla. Here of course the temperature is far 

 less variable tlian that of the water of spray-filled tide pools. 



A comparison of cotypes of Janiropsis kincaidi Richardson with 

 paratypes of laniropsis pugcttenms Hatch showed them to be identical. 



Figure 58. — laniropsis kincaidi derjugini Gurjanova: a, Incisor, laciiiia, and setal row of 

 left mandible; b, first maxilla; c, second maxilla. (Magnification as indicated by scale.) 



lANIROPSIS KINCAIDI DERJUGINI Gurjanova, new combination 



Figures 56, a, 6; 57, f-i, 58 ; 59 



Janiropsis derjugini Gurjanova, 1933, pp. 82-83 (in Russian), p. 90 (in English), 

 figs. 5, a-c, 6, a-f. 



Diagnosis. — Lateral borders of pleotelson smooth, lacking setae and 

 spinelike serrations ; posterolateral angles acute and projecting. Uro- 



