1914. J S.Kemp: Notes on Crustacea Decahoda. in 



Examination shows tiiat the mandible lacks both incisor- 

 process and palp, that there are no arthrobranchs at the base of 

 the peraeopods and that the inner antennular fiagellum is 

 conspicuously biramous. The species therefore belongs to the 

 genus Lysmata and I believe has not hitherto been described. 



The rostrum (fig. i) commences as a median dorsal crest a 

 little in front of the middle of the carapace ; it is straight and 

 extends onl}^ a trifle beyond the eyes. On its upper margin it 

 bears five teeth, two of which are situated on the carapace behind 

 the orbital notch, while the third is placed almost immediately 

 above that point ; the distance between the two posterior teeth is 

 slightly greater than that between those placed further forwards. 

 Iiiferiorly the rostrum bears two or three teeth very much smaller 

 than those on the upper edge and placed close to the apex in 

 advance of the anterior dorsal tooth. 



The only spine on the carapace is the antennal, the ptery- 

 gostomian angle is obtuse but not spinous. 



The lateral process on the basal segment of the antennular 

 peduncle (fig. 2) is sharply pointed anteriorl}^ and reaches to the 

 end of the segment ; the second segment is about as broad as 

 long. The inner antennular flagellum is biramous ; but the two 

 branches are fused basally for a distance equal to half the length 

 of the shorter ramus. The fused portion is composed of from 

 nine to twelve segments. 



The antennal scale is a little less than three and a half times as 

 long as wide and is not much narrowed distally. The outer 

 margin is concave and terminates in a spine which scarcely 

 extends beyond the lamellar portion. 



The third maxillipedes reach beyond the antennal scale by 

 one-half the length of the ultimate segment. The exopod is 

 conspicuous. 



The first peraeopods just fail to reach the apex of the scale. 

 The carpus is a trifle shorter than the chela and the finger is about 

 half the length of the palm. The second peraeopods, in the 

 single perfect specimen examined, are a little unequal, the longer 

 one extending beyond the antennal scale by the whole length of 

 the carpus and chela. Both ischium and merus are annulate and 

 there are 25 or 26 segments in the carpus. The last carpal seg- 

 ment is about as long as the palm, and the dactyUis, which is 

 decidedly longer than the fixed finger and bears two small teeth at 

 its apex, is almost as long as the palm (fig. 4). 



The third peraeopods reach beyond the antennal scale by the 

 dactyl us and three-quarters the length of the propodus ; the fifth 

 scarcely reach the apex of the scale. There are no spines on the 

 ischium and merus, but there are four large teeth, increasing in 

 size distally, on the dactylus. 



The fifth abdominal somite, measured dorsally, is three 

 quarters the length of the sixth and is about half as long as the 

 telson. The telson is shorter than both inner and outer uropods. 

 It bears two pairs of dorsal spinules and its convex lateral margins 



