ig6 



Memoirs of the Indian Museum. 



[Vol. V, 



The uropods reach midway between the lateral and intermediate teeth of the telson ; 

 the basal segment of the outer uropod bears a series of spinules on its outer edge. 



The two other larval stages in the collection are approximately 9-0 — 9-5 mm. in 

 total length (text-fig. 2d) and 7-3 — 8*o mm. in length (text-figs. 2e, /). At all stages 

 there is a certain amount of variation in the length of the rostral and postero-lateral 

 spines. This variation is most marked in the youngest stage ; text-fig. 2g is an 

 illustration of a specimen in which the spines are exceptionally long. 





GO. 



Fig. 2. — S quitta scorpto, Latreille. 

 Larvae presumably belonging to the var. Immaculata. 



a. Larva belonging to the largest stage obtained. 



b. Raptorial claw of the same larva. 



c. Carapace of the same larva in lateral view. 



d. Larva belonging to an intermediate stage. 



e. Larva belonging to the youngest stage obtained. 

 /. Carapace of the same larva in lateral view. 



g. Larva belonging to the same stage, with abnormally long rostral and postero-lateral spines. 



The pair of small spinules on the posterior margin of the carapace is developed 

 in all three stages ; by this character the Alima of S. scorpio var. immaculata appears 

 to be sharply distinguished from all larvae hitherto described. 



All the larvae obtained were found during the months of February, March and 

 July, at a time when the water of the lake was almost or quite at its saltest. Repro- 

 duction probably commences early in the year, as soon as the first influx of salt water 

 from the Bay of Bengal has taken place. 



