GREGARIOUS CRUSTACEA FROM CEYLON. 
29 
prp. 2, 4, 5.—Second, fourth, and fifth perseopods. 
urp. 1, 2, 3.—First, second, and third uropods. 
T.— Telson, this and the preceding details being from a male 
specimen. 
gn. 1 9, gn. 2 9—First and second gnathopods of the female. 
prp. 4. ? —Fourth peraeopod of female, with the side plate 
more highly magnified. 
Plate 6a. 
Gorophium. tricenonyx, n. sp. 
n.s .—Line indicating natural size of male specimen figured 
above. 
urp. 1, 2, 3.—Pleon much more highly magnified. 
a.s ., ad. —First and second antennae. 
gn. 1, gn. 2.—First and second gnathopods. These and the 
preceding details are from the male. 
Per. s,l 9 —Side plate of first peraeon segment in the female. 
ad. 9—Second antennae of the female. 
mxp.y —Maxillipeds of the female. 
urp. 1, 2.—Part of pleon of female, showing first and second 
uropods. 
Plate 6b. 
Gyathura pusilla, n. sp. 
n.s., n.s., juv. —Lines indicating natural size, respectively, of adult- 
female figured above and of young one at the side, fourth and 
fifth peraeon segments of young incomplete for want of space. 
n.s.$ gives the natural size of the male specimen from which the 
following details are drawn. 
PI. <5 —Pleon. 
mxp. 6 —Maxillipeds. 
gn. 1 <$, gn. 2 <s —First and second gnathopods. 
prp. 5 $—Fifth peraeopod. 
