GREGARIOUS CRUSTACEA FROM CEYLON. 
27 
EXPLANATION OF PLATES. 
Plate 1a. 
Baruna socialis, n. sp. 
n.s .—Natural size of carapace in specimen figured at the top 
of the plate, indicated by lines showing the greatest length and 
breadth. 
prp. 1.—Chaliped or first peraeopod in position. 
prp . 2.—-Second trunk leg or peraeopod of the same specimen. 
The following figures are drawn from a smaller specimen, also a 
male. 
mx. 2.—Second maxilla. 
mxp . 1, 2,3.—First, second, and third maxillipeds. 
PI .—The pleon. 
Plate 1b. 
Corallana* nodosa , Schiodte and Meinert. 
n.s .—Lines indicating the natural size of the specimen examined. 
G. —Cephalon, with first segment of peraeon, viewed a little 
sideways to show the prominences; first and second antenna on 
the left side removed. 
a.s ., a.i. —First and second antennae. 
Li .—Lower lip. 
m.m .—The mandibles. 
mx. 1, mx. 2.—The first and second maxillae. 
mxp .—The maxillipeds. 
gn. 1, 2.-—The first and second gnathopods. 
Plate 2. 
Tanais philetcerus , n. sp. 
n.s. —Line showing length of specimen figured above in lateral 
and in dorsal view. 
a.s., a.i. —The first and second antennae. 
m. —Mandible. 
l.i. —Lower lip. 
mx. 1, mx. 2. —First and second maxillae. 
mxp. —Maxillipeds. One from the outer, one from the inner side 
gn. 1, gn. 2.—First and second gnathopods. 
prp. 1 , 3, 5. — First, third, and fifth peraeopods. 
pip. 2.—Second pleopod. 
T. urp. —End of pleon with the uropods. 
* See footnote on page 14. 
