1914] ^- Kemp : Notes on Crustacea Decapoda 119 



is slightly ascendant and thence to the apex is quite straight or 

 (rarely) a trifle upturned. 



The carapace is bluntl}'' carinate mid-dorsally in its anterior 

 half and bears one, less commonly two, minute spinules behind 

 the basal crest of the rostrum. 



The corneal portion of the ej-es is, in dorsal view, only 

 very little wider than the stalk and is smaller than in the 

 preceding species. The antennular peduncle hardly reaches to two- 

 thirds the length of the antennal scale ; the second segment is 

 longer than the third and the lateral process, though it extends 

 beyond the eyes, fails to reach the distal end of the segment. 

 The antennal scale is unusually variable in form and ranges from 

 three to rather more than three and a half times as long as wide. 

 The distal end of the lamella always extends well beyond the spine 

 which terminates the straight or slightly concave outer margin, 

 and the flagellum is nearly twice the entire length of the animal 

 measured from the tip of the rostrum to the apex of the 

 telson. 



The mandibular palp bears neither incisor-process nor palp 

 and the oral appendages are closely similar to those of H. vittata. 

 The third maxilHpede falls short of the apex of the antennal scale, 

 the exopods reaching to rather more than half the length of the 

 antepenultimate segment. 



The carpus of the first peraeopods is a little shorter than the 

 chela, the dactylus is scarcely two-thirds the length of the palm and 

 the fingers, when the claw is closed, are in contact throughout 

 their length. In the second peraeopods the merus is indistinctl}'- 

 divided into from 7 to 11 segments, while the carpus is composed 

 of from 12 to 17. The palm of the chela is shorter than the 

 last carpal segment and is a little longer than the fingers. 



The last three pairs of peraeopods are provided with a variable 

 number of spines on the ventral aspect of the merus. Those of 

 the fifth pair extend to two-thirds or three-quarters the length of 

 the antennal scale. The dactylus varies considerably in length ; 

 it is usually one-quarter or one fifth the length of the propodus ; 

 but occasionally in smaller examples is longer (two-sevenths the 

 length of the propodus). The dactylus (fig. 4) is furnished with a 

 few small spinules posteriorly ; in several ovigerous females a small 

 spine is also found near the apex ; but this is never sufficiently 

 large to give it the characteristic appearance seen in H. vittata and 

 H. kilkenthali. 



The epipods at the base of the first four pairs of peraeopods 

 are strikingl}^ different from those found in the preceding species. 

 They are short and rudimentary and entirely concealed from view 

 by the downward growth of the pleurobranchs. 



The sixth abdominal somite is one-quarter longer than the 

 fifth. The telson (fig. 3) is about twice the length of the sixth 

 somite and bears two pairs of dorsal spinules. Its lateral margins 

 are concave, setose towards the apex, and terminate in a very 

 narrow and acute point which reaches almost to, or considerably 



