176 SPOLIA ZEYLANICA. 
The dimensions of the body are as follows :— 
a = 8") mm: b° = 20 anm: 
b= — 276 mm: b? = 3°2 mm. 
b? = 3:4 mm. e = 10°6 mm. 
b° = 2°56 mm. e§ = 4:5 mm. 
b* = 2°25 mm. e2 = 3:2 mm. 
b> = 1:9 mm. 
The dimensions of the second pereiopod are as follows :— 
4 = 2442; 660 | ct = 363; 429 
m = 3217; 660 | co = 825; 462 
cl = 1914; 403 p = 1485; 495 
Caso ioe dle ike ceh a Wiehe 
C—O oo 
The dactylos of the third leg has the ventral part slightly shorter 
and broader than the dorsal part. There are eight spines on the 
propodite of the third leg. The distal end of the carpos bears a 
blunt process on the dorsal side and a sharp spine on the ventral. 
The dimensions are as follows :— 
i = 1369; 891 | p = 3069; 561 
m = 3679; 1056 d = 858; 264 
c = 1914; 693 | 
General Distribution.—Red Sea, Indian Ocean. 
Genus Alpheus, Fabricius, 1798. 
Cephalothorax laterally compressed. Abdomen well developed. 
Rostrum small, rarely extending beyond first antennular article. 
Eyes covered by carapace. The orbital arches well defined and 
separated from rostrum and antennal sulcus by more or less well- 
defined grooves. Orbital spines generally absent. First antennal 
article shorter than the second. Antennular scale much reduced. 
Basal antennal scale usually extremely small. Pereiopods with epi- 
podites. First two pairs chelate. First pair of pereiopods extremely 
large and show well-marked asymmetry. Propodite with or without 
upper and lower notches. Carpus of second pair subdivided into 
five parts, the proximal part being less than the sum of the three 
following parts, the last three pairs of pereiopods ending in a simple 
dactylopodite. 
ALPHEUS vENTROSUS, H. M.-Edwards. 
(Plate V., Fig. 2.) 
Alpheus ventrosus, H. M.-Edwards. H. Nat. Crust., t. 2, p. 352, 
1837. 
Alpheus levis, Randall. J. Acad. Sci., Philadel., vol. VIIT., 1839, 
and many others. 
Alpheus ventrosus, Coutiére. Fauna of Mald, and Lacc., 1906. 
