19 18. J Stanlfa' Kemp: Decay oda nf the InU Lale. 99 



He-Ho river, at 3800 ft., amoiii'; the roots of trees and under floatinjf 

 leaves and twi.^s. 



Dr. Annandale has supplied me with the followint; notes on the 

 colouration of livinii; specimens. — " Individuals from the open part of 

 the lake were translucent but speckled more or less densely with dark 

 olive green and shining white. On the sides of the thorax the dark 

 specks tended to congregate in three broad vertical bars, but in this 

 respect the colouration was variable. In darker individuals somewhat 

 indefinite cross bars could also be detected on the posterior margin of 

 each abdominal segment. Individuals from the black water of the 

 He-Ho river were speckled with black or very dark purple, and had no 

 white specks. There was a slanting dark bar a little behind the middle 

 of the thorax and usually another, less distinct, in front of it. There 

 was also a^n irregular dark mark near the posterior margin of the carapace. 

 A dark spot was always present at the base of each pleopod and there 

 was sometimes a round dark spot at each side of each abdominal seg- 

 ment near the dorsal surface. 



The aberrant Trematode Caridinicola is usually to be found in the 

 gill-chambers of individuals from the lake, and the Protozoon Cothurnia 

 is abundant on their uropods and other appendages." 



In addition to the specimens from the Shan plateau, there are in the 

 Indian Museum five specimens (two of which are ovigerous) obtained by 

 Wood-Mason from " Upper Tenasserim," and two (one of which is 

 ovigerous) found by Dr. Annandale in a swampy lake at Kawkareik, 

 in level country in the interior of the Amherst district, Tenasserim, in 

 March, 1908. 



The types, which are from the Inle Lake, bear the number 9783/10, 

 Zool. Surv. Ind. 



Caridina weberi, de Man. 



1892. Caridina iveberi, de Man, in Weber's Zool. Ergebn. Beise Nied Osl.-Ind. 

 II, p. .371, pi. xxii, fig. 23. 



prox. var. sumatrensis, de Man. 



1892. Caridina weberi vnr. sumatrensis, de Man, ibid., p. 375, pi. xxii, fig. 23(7. 



The commonest Caridina of the plains of India and Burma is a form 

 allied to de Man's C. weheri var. sumatrensis. A cursory examination 

 of the Museum collection, which contains samples from many widely 

 distant localities, shows that there are in India a great number of local 

 races, some of which will probably be found to deserve recognition in 

 nomenclature. I will therefore in this account of the Inle Decapoda 

 content myself with a few remarks on the characteristics of the Shan 

 race and on the features in which it differs from that found in Sumatra. 

 The differences, though considerable, do not appear to be specific. 



The rostrum reaches to the middle or end of the second segment 

 of the antennular peduncle. Its straight or shghtly convex upper 

 border bears from 12 to 20 teeth (usually 13 to 18), ^ distributed through- 

 out its length, and of these, 3 or 4 (rarely 2) are placed on the carapace 



1 Of one hundred specimens three have 12 dorsal teeth, ten have 13, seventeen have 

 14, thirty-seven have 15, fifteen have 10, eleven have 17, six have 18 and one has 20. 



