BARBADOS-ANTIGUA REPORTS 75 
The emarginate front is very Betaeus-like, having much the shape and 
form of Bate’s figures of his C. malleodigitus and microstylus,1° especial- 
ly the latter. The smooth, shining carapace is membranous, and sub- 
globular or inflated to the extent of being strikingly Pontonid-like. For 
the sub-group to which this species is here assigned, the slender an- 
tennules and antenne represent probably an extreme development; the 
median segment of the antennular peduncle is about six and one-half 
times as long as wide, about three times as long as the first, and four 
times the third segment; the flagella are about as long as the peduncle 
and nearly of the same length, the thicker being a little shorter than its 
companion; the antennal peduncle reaches about one-third the length of 
the median antennular segment, and its flagellum one-sixth its length be- 
yond the longer, thinner, antennular flagellum; the antennal scale is more 
or less reduced though from two-thirds to three-fourths the length of the 
antennal peduncle, blade not differentiated from spine; the antennular 
scale likewise very small, being a mere basal lobule on the outer side of 
the first joint of the peduncle. 
The more or less cylindrical larger hand is about three times as long 
as wide (high); the longer diameter of the movable finger is a little 
less than the distal width of the palm, in dorsal view behind the articula- 
tion of the finger; the larger hands of the smaller specimens are relative- 
ly more slender, more cylindrical, and with proportionately, slightly larger 
movable fingers; the smaller chela is long and slender in the few spec- 
imens retaining the first legs; this hand of the pair is as long as the 
palm of the larger hand from the articulation of the movable finger to 
the base; the slender, similar fingers of the smaller chela in length about 
equal two-thirds the plam. The first carpal joint of the second legs is 
about four-fifths of the second and longest; the third, fourth and fifth 
are nearly all of the same length, their combined length making up just 
half of the entire length of the carpus; the third is slightly shorter than 
the fourth and this in turn is a little less than the fifth in length; the 
chela is as long as the fourth and fifth joints taken together; the fingers 
equal about two-thirds the palm, or two-thirds of the entire hand in 
length. The meral joints of the ambulatory legs are unarmed beneath, 
that of the third legs being just a little better than three times as long 
as its greatest width. 
The triangular telson is most peculiar for an Alpheid: there are no 
dorsal spines, and either margin is armed at about one-eleventh the length 
of the telson from the distal lateral angles, with a small spine; the end 
of the telson carries three pairs of spines of which the ‘‘sub’’-median 
pair is the largest and the external the smallest; between the submedian 
spines there are about seven principal setae and a number of shorter 
ones; the greatest width of the telson near its base is just about three- 
fifths its length, the width of the distal extremity about one-seventh. 
10 Challenger Rept., Zool., XXIV, [pt. 52] (1888), pp. 565 and 566, 
and pl. 101, figs. 5 and 6, respectively. 
