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ZOOIvOGY OF THE FAR EAST. 









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There are also in the collection two very small individuals, 43 and 46 mm. 

 in total length, that I consider to be young examples of this species. They were 

 obtained in the Patani river, below the town of Patani in the Siamese Malay States. 



In the Indian Museum collections I have not been able to find any specimens of 

 P. carcinus as small as these; the youngest, which are from Garia, near Calcutta, 

 being 65 and 69 mm. in total length. 



In the larger of the Patani river specimens the rostrum extends beyond the 

 antennal scale by about one-quarter its length, and bears 12 teeth above and 10 below. 

 In the smaller individual the rostrum reaches beyond the scale by about one third of 

 its length, and bears 14 teeth above and 11 below. In the young specimens from 

 Garia the rostrum is fully as long as in the smaller Patani individual, and bears 13 or 

 14 teeth above and 12 or 14 below. The second legs in both Patani specimens reach 

 beyond the end of the scale by the length of the chela — in those from Garia by the 

 chela and fully one-third of the carpus. The segments yield the following measure- 

 ments (in mm.) : — 









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I In the largest specimen, which is evidently a male, the appendix masculina is represented by a small bud ; in the 

 others no trace of it can be detected. 



