CRUSTACEA OF THE MERGUI ARCHIPELAGO. 101 
of Telphuse in the Zoological Museum of Berlin, informed me 
that it was not represented in that Museum. Though closely 
allied to 7. Callianira, it is distinguished from it at first sight 
by the more enlarged front and, probably even from all other 
Telphuse, by the remarkable structure of the postfrontal ridge. 
The outer appearance of the cephalothorax is very similar to 
that of Telphusa Callianira, being rather narrow, although broader 
than long, and having the epibranchial regions scarcely if at all 
inflated. The proportion of the distance between the epi- 
branchial teeth to the length of the cephalothorax (the abdomen 
not included) is as 16:18, so that the carapace is comparatively 
a little broader than that of Zelphusa Callianira. The upper 
surface is rather depressed; anteriorly it is very declivous and 
the front is strongly deflexed. The proportion of the distance 
between the epibranchial teeth to the breadth of the anterior 
margin of the front is as 16:73, so that the front is almost 
half as broad as the distance between the epibranchial teeth. 
The anterior margin of the front presents a wide but very 
shallow median sinus. As in the preceding species, the frontal 
margin forms a right angle with the upper margins of the orbits, 
and the upper surface of the front is somewhat granular. The 
upper surface of the carapace has nearly the same structure 
as that of TL. Callianira. The postfrontal ridge is interrupted 
in the middle by the median frontal furrow, aud again on each 
side at some distance from the epibrauchial teeth; the two 
median (or internal) portions are therefore, as in the preceding 
species, more advanced than the lateral, from which they are 
completely separated. The anterior or median portions of the 
ridge, which occupy as usual the epigastric lobes, do not con- 
stitute a single ridge, but are composed of four or five smaller, 
parallel, rugose elevated lines. The lateral portions, however, 
are ridge-like and directed towards the epibranchial teeth; but 
are not continued so far, as they are interrupted at some distance 
from the lateral margins. As in 7. Callianira, one or two rugose 
lines are observed immediately behind the interruption. This 
species therefore probably differs from all other Zelphuse by the 
occurrence of two accessory median ridges immediately behind the 
postfrontal ridge, z.e. at some distance behind the internal or 
median portions of the latter, one on each side of the median 
frontalfurrow. These ridges are not continued behind the lateral 
