30 Memoirs of the Indian Museum. [Vol. IV, 



margins of the two succeeding somites are more narrowly rounded than in 5. lalreillei 

 and the anterior spinous process found on the seventh somite of 5. decor ata is absent 

 (fig. 5). The eighth somite is produced laterally as a rounded anterior lobe. 



Faint submedian and intermediate carinae are present on the last three thoracic 

 and on all the abdominal somites. The submedians are parallel and not posteriorly 

 divergent as in the preceding species. On the 3rd, 4th and 5th somites there are ex- 

 tremely faint traces of median tubercles. The following carinae end in spines : — 

 Carinae. Abdominal somites. 



Submedian 



Intermediate 

 Lateral . . 

 Marginal . . 



5,6. 



5,6. 



,2,3,4,5,6. 



The lateral carinae are semi-obsolete except on the ist somite. The submedian 

 and intermediate carinae of the 6th somite are greatly swollen in the adult male. 



The form of the telson is astonishingly different in the two specimens examined. 

 In the smaller female example (fig. 12), the median carina is obscurely notched near 

 the base and terminates in a short spine. The dorsal surface on either side is very 

 finely rugose, but is otherwise smooth except for the lateral edge which is upturned 

 proximally and for obscure elevations at the base of the submedian and intermediate 

 teeth. The usual three pairs of marginal teeth are well developed and those of the 

 submedian pair appear to have had movable tips. There are two or three submedian 

 denticles, six intermediate and one lateral. The praelateral denticle is missing. In the 

 adult male, the type (fig. 11), the base of the submedian spines is greatly inflated, 

 while from the intermediates two huge, swollen and internally curved ridges, higher 

 than the median carina, extend backwards nearly as far as the antero-lateral corners. 

 The submedian and intermediate spines are very blunt and the lateral spine and denticle 

 are represented by two small nicks in the margin. There are three or four submedian 

 and six or seven intermediate denticles. The median carina is obscurely notched at the 

 base, the distal spine is non-existent and on either side, in the hollows between the 

 three prominences, there are obscure indications of a longitudinal row of pits. The 

 lateral margin is strongly upturned proximally. 



The bifurcate process from the base of the uropod resembles that of the preceding 

 species, except that the spines on the inner margin are replaced by a row of fine 

 serrations. 



The colouring of spirit specimens does not seem distinctive. 



There is one specimen in the Indian Museum : — 

 ^ 9 Buntal or Pulo Burong, Borneo. Sarawak Museum. 1 ? , 48 mm. 



This individual was presented by Mr. J. C. Moulton, to whom I am also indebted 

 for the opportunity of examining and figuring Nobili's type specimen, the only other 

 example known. The latter, a male 76 mm. in length, was found at Pulo Burong, 

 Borneo. 



