172 SPOLIA ZEYLANICA. 
In giving the sizes of the various species I have used the following 
symbols :— 
a = Total length of carapace along the mid-dorsal line, com- 
mencing at the base of the rostrum. 
b! to b& = Lengths along the mid-dorsal line of abdominal 
segments 1 to 6 respectively. 
6? = Total length of telson. 
e = Greatest length of propodite of large claw. 
e! — Greatest height of propodite of large claw. 
e> — Greatest length of dactylopodite of large claw. 
I shall not follow Coutiére’s terms for the parts of the antennules 
and antenne. 
For “stylocerite”’ I shall use antennular scale ; for “‘ carpocerite,” 
antennal peduncle ; instead of “scaphocerite,”’ antennal scale; and 
I shall use. basal scale instead of Coutiere’s ‘‘ basicérite.” 
The following is the literature which has been chiefly consulted 
in the compilation of the present lists :— 
1. Pearson.—Herdman’s Ceylon Pearl Oyster Report. Supple- 
mentary Report No. XXIV. The Macrura. 
1905. 
2. Coutiére—Gardiner’s Fauna and Geography of the Maldive 
and Laccadive Archipelagoes. Les Alpheide. 
1906. 
Genus Synalpheus, Spence Bate, 1888. 
Cephalothorax laterally compressed. Abdomen well developed. 
Rostrum small and extremely variable in shape and length. 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 in front of orbital arch always present and 
well developed, often equal in length to rostrum. First antennular 
article longer than the others. The antennular scale well developed. 
Basal antennal scale well developed. Pereiopods without epipodites. 
First two pairs chelate. First pair extremely large and asym- 
metrical ; the propodite without upper and lower notches ; the 
dactylopodite short. Carpopodite of second pair subdivided into 
five parts ; the first part at least equal in Iength to the sum of the 
three following parts. Dactylopodite of last three pairs either 
bifid or trifid. . 
SYNALPHEUS NEOMERIS, var. STREPTODACTYLUS, Coutiére. 
Synalpheus neomeris, var. streptodactylus, Coutiére. Fauna of 
Mald. and Lacc., 1906. 
Two specimens, from Trincomalee ; January, 1911. 
The rostrum and orbital spines are equal in length and about 
two-thirds the length of the first antenuulayr article. 
