74 DR. G. C. BOURNE ON THE RANINIDjE : 
and flattened. First abdominal tergum not much narrower than the posterior 
margin of the carapace, about equal in breadth to the second tergum, the 
remaining terga progressively narrower ; the tclson small and triangular. 
NOTOSCBLES OHIMMONIS, n. Sp. (PI. 4. figS. 2 & 3.) 
Carapace minutely punctate to smooth over the greater part o£ ils surface, 
but granular towards the frontal region : proportion of length to breadth of 
carapace about 5 : 3. The frontal region is marked off by a distinct trans- 
verse ridge joining the bases of the extra-orbitalspines. The median frontal 
region is fairly broad and produced anteriorly into a median pointed rostral 
spine at either side of the base of which is a triangular flattened and some- 
what upturned spine, the margins of all three spines minutely serrated. On 
either side a fissure separates the median frontal projection from a short 
triangular tooth or spine, and outside the latter is a prominent incurved 
extra-orbital spine. A single lateral spine occurs on either side of the cara- 
pace a short distance behind the extra-orbital spine, and nearly of the same 
size as ihe latter. On the upper surface a slight carina runs from the 
median rostral spine to the transverse granular ridge separating the fronto- 
orbital region from the rest of the carapace. In the chelipeds the anterior 
edge of the ischium is serrated ; the merus largely dilated externally at its 
base ; the carpus granular above and without a distal spine ; the propodus 
bears two subequal spines on its lower margin, and on its upper surface are 
tvifo parallel ridges separated by a narrow groove ; the immobile claw bears 
four denticles on its inner margin. In the third uiaxillipeds the relative 
length of the merus to the ischium is as 6 : 10 ; the lower surface of the 
merus is granular and hairy. The pterygostoniial regions are hairy. In the 
sternal region the chelipedal sternum is of the shape characteristic of 
the Raninidse, the following sternal element flat, broad in front and narrow 
posteriorly; the third element of the sternal plastron triangular, convex, the 
apex of the triangle anterior. The articular ca\ities of the first and second 
pereiopods approximated to the middle line. The first abdominal tergum is 
flat and quadrangular, not much narrower than the posterior mai-gin of the 
carapace ; the second abdominal tergum is nearly equal to it in width ; the 
remaining abdominal terga narrow rapidly and the telson is small and sub- 
triangular in shape. 
Two specimens from the Sulu Sea, both males. Length of the larger 
specimen with the abdomen fully extended 28 mm.: length of carapace 
20 mm. : greatest width of carapace 13 mm. 
The species is named after Captain Chimmo, R.N., of H.M.S. ' Nassau,' 
whose collections from the Sulu Sea were presented to the Oxford University 
Museum in 1872. 
I am of the opinion that Raninoides serratifrons, Henderson (36) should 
