CEHYLON ALPHEID 4. 173 
The first antennular article is twice as long as the third and one 
anda half times as long as the second. The antennular scale extends 
to the middle of the median article. 
The antennal peduncle extends beyond the antennular peduncle 
by a distance equal to the third antennular article. The antennal 
scale is slightly longer than the antennular peduncle, but the leaf-like 
portion is considerably shorter. The basal scale bears two spines : 
a larger ventral one which nearly reaches the middle of the median 
antennular article, and a smaller dorsal spine which extends as far 
forward as the orbital spine. 
This variety only differs from de Man’s species neomerts in the 
form of the dactylopodites of the third and following pereiopods, 
The main spine of the dactylos is narrower than in de Man’s species, 
and not so curved. The dorsal spine is longer than in neomeris, 
and is about two-thirds as long as the main spine. 
The two specimens are very small, and are, moreover, im a very 
bad state of preservation, so that satisfactory measurements of the 
body cannot be given. Measurements of the first three pereiopods 
are appended, but I cannot say with any certainty that they all 
belong to the same individual. The only value of these measure- 
ments, therefore, is that they give the proportions of the parts of 
the legs. 
Large chela. 
e = 5'0 mm. e2 == 1 mam: 
ef ==) 1b ming. 
Second pereiopod.* 
1 = 1683; 3707 c4 = 165; 287 
m = 2112; 363 | e — 429; 330 
e=u— Iho; 280 | p = 1056; 363 
oc? = 231; 280 | ad = 676; 148 
c3 = 181; 277 | 
Third perevopod. 
m = 2310; 594 | p = 2046; 363 
¢ = 1122; 429 | ad = 660; 214 
General Distribution.—Maldives, Ceylon. 
SYNALPHEUS GRAVIERI, Coutiére. 
Synalpheus graviert, Coutiére. Fauna of Mald. and Lacc., 1906. 
Ten specimens, from the Pearl Banks ; February, 1911. 
This form is closely allied to Synalpheus neomeris, but differs from 
it in having a longer antennal scale and a slightly shorter basal scale. 


* ; — ischiopodite ; m — meropodite ; c’ to c® = segments 1-5 of the carpo- 
podite ; p = propodite; d = dactylopodite. 
+ The first of these numbers refers to the length, and the second to the 
width, of the segment in terms of . 
