GREGARIOUS CRUSTACEA FROM CEYLON. 
II 
1904. Cirolctnidce , II. Richardson, Proc. U. S. Nat. Mus., vol. 
XXVII., p. 35. 
Other references for the family and information upon it may be 
obtained from the above selection. 
CIROLANA , Leach. 
1818. Cirolana , Leach, Diet. Sci. Nat., vol. XII., p. 347. 
1902. Cirolana , Dollfus, Bull. Soc. Zool., France, vol. XXV1I1., 
p. 5. 
Many other references for the genus will be found under those 
for the family. In regard to the last but one of these it may be con¬ 
venient to mention that the species described by Ives in the 
Proc. Ac. Philad., p. 187,1891, is Cirolana mayana (not magara ), 
and that Miss H. Richardson’s new genus is Colopisihus (not 
Calopisthus ). 
CIROLANA WILLEYI, n. sp. 
PI. 3. 
The broadly convex front of the head has a small triangular 
rostrum between two slight depressions. The head’s dorsal surface 
is smooth in the female, but in the male carries about five tubercles 
distributed in two rows. The segments of the person have each 
about eleven tubercles on the hind margin, those on the first three 
segments scarcely or not at all perceptible until the segments 
have been separated. The first, which is the largest, segment is 
tuberculate on the medio-dorsal surface in the male, but not 
in the female. Of the pleon the first segment is concealed and 
smooth, the second to the fifth have fewer but more conspicuous 
tubercles than the peraeon segments, the median tubercle of the 
fifth segment forming a large tooth. The fifth segment is 
laterally completely overlapped by the fourth, and that again by 
the third. The telsonic segment is more or less triangular, in¬ 
cised near the base for the insertion of the peduncles of the 
uropods, the apex blunt, fringed with setules and eight spines, the 
dorsal surface carrying two little curved submedian ridges. 
The eyes are dark, wide apart. 
The first antennae have the first two joints coalesced, the third 
rather longer than this combination, the flagellum of ten or twelve 
joints being scarcely as long as the peduncle. 
The second antennae fold back beyond th,e third peraeon segment, 
with the many-jointed flagellum considerably longer than the 
peduncle, and furnished densely with setae along the proximal 
half in the male, but not in the female. Both the male and 
female from which the figures are drawn happened to have the 
