J918.] Stanley Kemp: Becapoda of the Inle Lake. 97 



infrequently the distal sixth or seventh of the rostrum is unarmed. 

 The teeth in the middle of the series are the most crowded and the 

 posterior 2 to 4 (usually 3) are situated on the carapace behind the 

 orbit. The lower margin of the rostrum bears from 2 to 6 small teeth 

 (usually 2 to 5, very rarely 1),^ situated in the distal third of its length. 



At the lower angle of the orbit there is a narrow projecting lobe, 

 furnished with setae, and immediately below a sharp antennal spine. 

 The antero-inferior angle of the carapace is rounded. 



The eyes are normal. The antennular somite is not dorsally carinate. 

 The antennular peduncle (fig. 7) reaches to, or a little beyond the tip 

 of the spine on the antennal scale. The lateral process does not nearly 

 reach the end of the basal segment. The second segment is long and 

 slender ; in dorsal view its length is quite two and a half times its basal 

 breadth. The antennal scale (fig. 8) is slender, from three and a half to 

 rather more than four times as long as broad ; its outer margin is 

 distinctly concave. 



The epipod of the third maxillipedes is short and pointed. 



The carpus of the first peraeopods (fig. 9) is from 3-0 to 3-4 times as 

 long as its distal breadth ; rarely it is stouter, sometimes only 2-4 times 

 as long as broad. The segment is remarkable for the entire absence of 

 the excavation at the distal end. The second peraeopods (fig. 10) are 

 slender and reach a little beyond the middle of the second segment of the 

 antennular peduncle. The carpus is from 1\ to more than 8 times as 

 long as its distal breadth ; the chela is from 4| to -5 times as long as 

 wide with the fingers from 1^ to 1| times the length of the palm. 



In the third peraeopods which reach about to the end of the anten- 

 nular peduncle, the propodus is from 2-7 to 3-2 times the length of the 

 dactylus (fig. 11). The latter segment is slender and bears from 8 to 12 

 spines (fig. 12). The fifth peraeopods are about the same length as the 

 third, but the dactylus is proportionately longer, the propodus being 

 from 2-2 to 2-5 times its length (fig. 13). The spinules on the dactylus 

 vary in number from 44 to 66 (fig. 14) and appear to be least numerous 

 in males. 



There are as usual eight branchiae and, in addition, the distal end 

 of the epipod of the second maxillipede is divided into a small number 

 of plumes which doubtless have the function of gills. The epipods on 

 the first two peraeopods are fully formed ; that on the third pair is small 

 and rudimentary and that of the fourth pair is entirely absent. 



The form of the endopod of the first pleopod of the male is shown 

 in fig. 15. 



The telson is a little longer than the sixth somite ; its apex is broadly 

 truncate and bears 6, 7 or 8 slender spines between the small spinules 

 at its lateral angles. In addition there are from 3 to 5 pairs of dorso- 

 lateral spinules. The spinules on the outer uropod vary in number 

 from 9 to 13. 



The eggs are very large ; when freshly extruded they are about 

 0-9 mm. in length and 0-55 mm. in breadth. When about to hatch 



^ Of one hundred specimens one has only 1 ventral tooth, fourteen have 2 teeth, 

 thirty-one have 3, thirty-two have 4, fifteen have 5 and seven have 6. 



