New Isopod — Vandel 
177 
Fig. 2. Caucasonethes rothi n. sp.: Maxilliped; h, maxillula, end of the outer endite; c, first pleopod of male, 
en — endopodite,^Ar — exopodite; d, posterior end of exopodite of first pleopod of male; e, genital duct; /, second 
pleopod of male. ' 
Pleopod 1 (Figs. 2c, <7)— endopodite blade- 
like, triangular, very narrow and lengthened, 
destitute of terminal stalk. Exopodite large, 
quadrangular, terminated with 2 lobes, one 
quadrangular and ciliated, the other triangular 
and pointed. 
Pleopod 2 (Fig. 2/)— endopodite bisegment- 
ed, sharpened at end; exopodite rectangular. 
RELATIONSHIP OF CAUCASONETHES ROTHI 
N. SP. AND OREGONISCUS NEARCTICUS 
(arcangeli) 
Arcangeli (1932: 137) gave the name of 
Trlchonlscus nearctkus to a single female from 
MacLeay Park, Portland, Oregon. Hatch 
(1947: 190) proposed the generic name Ore- 
goniscus for this species. 
