94 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
This species can be distinguished from G. acanthochirus Stimpson and G. grandimanus (Gibbes, 
as Callianassa) by its non-spinous front and chelipeds and the subequal length of the two branches of 
the outer caudal lamella. 
Length in median line, exclusive of antennae, 52.2 mm.; length of carapace, 14.9 mm.; length of 
carpus and propodus together, measured to end of pollex, 18.5 mm. 
Type locality; Mamanguape Stone Reef, Brazil. Porto Rico: Hucares, 1 male. 
Genus CALLIANIDEA Milne Edwards. 
Isca Guerin, Ann. Soc. Entom. France (1), I, 295, 1832. (Name preoccupied.) 
Callianidea Milne Edwards, Hist. Nat. Crust., II, 319, 1837. 
Callianisea Milne Edwards, Hist. Nat. Crust., II, 321, 1837. 
Callisea Dana, Crust. U. S. Expl. Exped., I, 510, 1852. 
Outer maxillipeds slender, pediform. Second pair of pleopods like the following three pairs; in 
all these pleopods the margins, instead of being fringed with small hairs or cilia, have these modified 
into soft and flexible articulated membranous filaments. General appearance that of Callianassa. 
Callianidea lasvicauda Gill. 
Callianidea Ixvicauda Gill, Proc. Acad. Nat. Sci. Phila., xi, 167, 1859. 
Rostrum equilaterally triangular, obtusely pointed. A less prominent obtuse tooth is above 
insertion of antenna; just above the tooth a closed horizontal suture runs back a little on carapace. 
Transverse suture on the carapace, at about two-sevenths the distance from the posterior margin, is 
very deep. Posterior margin produced backward at middle in a prominent lobe. The eye plates are 
thickened except their inner distal third, which is thin, laminate. Cornea small and protuberant and 
situated near outer margin. Last joint of antennular peduncle longer than penult joint. The two 
branches of flagellum are of about equal size near the base, the lower is a little longer and tapers to 
the tip, the upper is thickened in its distal portion. Thickest point at about the sixteenth segment 
from tip. Antennulte nearly as long as carapace. Penult joint of antenna about 1.5 times as long 
as last joint. Tips of flagella broken off, but the flagella are longer than carapace. 
Ischium, merus, and carpus of the outer maxillipeds wider and shorter than in the figures of C. 
typa. The merus has a small spine on its lower margin near distal end. Ischium of large cheliped 
compressed and dilated anteriorly wdth articulating surface for the merus oblique. Merus about a 
third longer than ischium, subovate, flat internally, convex externally above; inferior margin anteriorly 
tridenticulate and hairy. Carpus vertical, about twice as high as long; its posterior articulating process 
about as long as broad and divided into two unequal parts by a wide groove on its inner side; it 
projects acutely below and is there denticulate. Manus oblong, fully three times longer than carpus, 
with parallel borders; its intern o-superior border is provided with along row of hairs and its superior 
surface has a few distant fascicles of hair; inferior margin crenulated and on each side a row of fascicles 
of hair. Digital process of manus about two-thirds as long as manus itself and with five tubercles on its 
posterior half, the anterior of which is largest; anterior to this it is crenulated, as are also the margins 
on each side. The dactylus is curved and crosses the pollex, leaving a hiatus; above it is rounded, 
with a row of hairs on each side, the interior of which is very dense; below the external margin of 
excavation has a moderate tubercle at its middle, and posteriorly two large ones; internal border 
anteriorly crenulated; a few pits with fascicles of hair are between the ridges of excavation and on 
each side. 
The second pair of feet is not only long-hairy below, but has the last three joints fringed with 
hair above. Fourth pairof feet compressed, the fifth subcylindrical. Terminal joint of first pair of abdom- 
inal feet lanceolate. The next four pairs of feet have two laminate branches broader and more oval 
than represented in C. typa. The cylindrical filaments with which they are fringed are composed of three 
joints placed end to end and not branching as in C. typa. The inner branch of the caudal lamella has 
on its carina, two spinules — one at middle, the other at distal end. 
This species in its rostriform front resembles C. mucronata Kossmann, but is easily distinguished 
by the character of the abdominal filaments. 
Length in median line, exclusive of antennse, 61.3 mm.; length of carapace, 15.3 mm.; length of 
carpus and hand together, measured to end of pollex, 25.2 mm. 
Ensenada Honda, Culebra, 1 female. Barbados, under rocks, within coral reefs (type locality). 
