BULLETIN OF THE UNITED STATES FISH COMMISSION. 
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the claw slender and curved; next 2 pairs shorter and stouter, claw short; last 3 pairs also shorter, 
the joints furnished with a few short spines. 
Pleopods, 5; uropods biramus; the inner ramus 1-jointed, shorter than first joint of outer ramus, 
with a terminal tuft of setae; outer ramus 5-jointed, fifth joint longest, but shorter than peduncle 
of uropod. 
Arroyo, one specimen; Culebra, one specimen. Length, female, 3.8 mm.; width, 0.8 mm. 
This species is distinguishable from L. saviynii by the greater proportional length of the dactylus, 
the proportional length of the head, and the segments of the thorax, the shape of the last abdominal 
segment, the form of the chelae, and by its greater size. It may possibly be the female of L. rapax 
Harger, of which I have seen no specimens, but is considerably larger- than Harger’s specimens. 
Tribe FLABELLIFERA. 
CIR0LAN1D/E. 
Key to Porto Rican genera and species. 
a. Uropods normal, forming with telson a caudal fan, inner angle of peduncle produced; maxillipeds with 
5-jointed palp; peduncle of second antenna; 5-jointed; first pleopods not opercular Cirolanh. 
I). About first 10 joints of second antenna; each with 2 tufts of seta; projecting forward, the whole forming 
a brush on anterior edge. Clypeus with a prominent obtusely pointed spine on anterior margin. . 
C. may ana Ives. 
bb. Without brush-like rows of seta; on second antenna;. No spine on clypeus. 
c. Apex of telson rounded, uropods subbifid; flagellum of first antenna; 11 or 12 jointed C. parva Hansen. 
cc. Apex of telson broadly truncate; the uropods rounded at ends; flagellum of the first antenna; 
8-jointed C. obtrwncata Rich. 
aa. Uropods resembling the pleopods and concealed beneath telson, peduncle slender; maxillipeds with 
1-jointed palp; peduncle of second antennse 4-jointed; first pleopods not opercular.. Branchuropus, new genus. 
Only species B. littoroMs, n. sp. 
Cirolana mayana Ives. 
Body elongate-ovate, about 2.5 times as long as broad, strongly convex. Front produced to a 
triangular deflexed process united in front of first antennse with the quadrate reflexed portion of 
epistome. Head to base of rostrum about 2.5 times as broad as long, front on each side of median 
process nearly straight. 
First, segment about as long as head, fifth and sixth almost as long, rest of segments shorter. 
First abdominal segment entirely and the second partly concealed dorsally, the next three equal, 
the third laterally concealed by the seventh thoracic segment. Telson about one-fourth broader than 
long, sul Triangular, lateral margins curved, tip with short seta?, a strong depression on each side of 
lateral line near base. 
Eyes occupying entire lateral margin of head, first antennae reaching to the middle of second 
segment, with a 10 to 12 jointed flagellum, last joint of peduncle with a row of bristle-like setae on 
posterior margin. Second antennae about twice as long as first, reaching to end of third segment, with 
a 5-jointed peduncle and a flagellum of from 21 to 24articuli, the first 10 joints (about) short and broad 
and furnished with 2 rows of close-sc.. setae near the anterior or outer margin, constituting an 
outwardly projecting brush. 
Epistome subtriangular, sides slightly incurved, expanded and dorsally reflexed in front of 
second antennae, and uniting with frontal process. Clypeus with a strong, blunt process projecting 
downward and forward to between bases of second antennae. Mouth parts as usual in the genus. 
Thoracic limbs and pleopods not peculiar. Uropods reaching beyond end of telson, outer ramus 
the longer, with two blunt spines near tip and two on inner margin; inner ramus more than half as 
broad as long, its outer border emarginate, posterior and inner borders with about five spines; outer 
border of external ramus naked, inner and posterior borders setiferous; almost entire border of inner 
ramus setiferous; peduncle with a few long setae on internal angle and several spines at base of outer 
ramus beneath. 
Specimens from Boqueron Bay and Culebra. Largest, 12.5 by 5.1 mm. ; smallest, 5.8 by 2.2 mm. 
