CEYLON ALPHEID®. 175 
The large claw differs somewhat from that of S. biwunguiculatus in 
having the spine at the distal end of upper palmar surface upturned 
so as to resemble the claw of Synalpheus apioceros. 
The second pereiopod is richly clothed with sete near its distal end. 
Its dimensions are as follows :— 
i = 2046; 561 ct = 297; 379 
m = 2706; 561 ce? = 627; 412 
co} = 1617; 396 p = 1254; 429 
c” = 363; 396 d = 759; 198 
3 = 297; 379 
The third pereiopod has a single spine at the distal end of the 
posterior border of the carpopodite, and eight spines on the posterior 
border of the propodite. The dactylopodite is biunguiculate, the 
two parts being almost equal. The dimensions are as follows :— 
I 
i = 1089; 825 | » = 2079 ; 528 
m = 3399; 1056 d = 396; 214 
c = 1551; 627 | 
General Distribution —Maldives and Ceylon. 
SYNALPHEUS TUMIDO-MANUS, Paulson. 
Synalpheus tumido-manus, Paulson. Red Sea Crustacea, 1875. 
Synalpheus neptunus , Coutiére. Bull. Soc. Ent., France, 1898. 
Synalpheus twmido-manus, Coutiére. Fauna of Mald. and Lace., 
1906. 
One specimen, from the Pearl Banks ; November, 1910. 
Six specimens, from bottom of ss. “ Violet,’? Colombo ; October, 
1910. . 
Twelve specimens, from Colombo Harbour ; September, 1907. 
This species resembles Synalpheus biunguiculatus, but differs from 
it in the antennal peduncle being comparatively shorter. There is 
also a slight difference in the dactylopodite of the third pereiopod. 
The chela is also slightly longer in proportion to the height. 
The rostrum and orbital spines resemble those of Synalpheus 
buinguiculatus, var. exilipes, except that the rostrum is slightly 
longer. 
The first antennular article is twice as long as the distal article and 
slightly longer than the median. The scale extends past the middle 
of the median article. 
The antennal peduncle is only slightly longer than the antennal 
and about the same length as the antennal scale. The ventral part 
of the basal scale extends beyond the basal antennular article, and 
the dorsal part is but feebly developed. 
