iqoy.] Records of tJic I ndian Museum. 25 



rigaudi is a good second. (Occurs in collections Nos. 7, 8, 9, 13, 

 14, 16, 17.) 



6. Scapholeberis kingi, Sars. 



Abundant in the Museum tank in Februar}^ and at that time 

 a few of the females bore ephippia. In a collection taken in March 

 the numbers had somewhat decreased. (Nos. y , 8, 9, 11.) 



So far this species had only been found in Sumatra and Siam. 



7. Macrothrix triserialis, Brady. 



A few specimens taken at Chakradharpur (Nos. 14, 16). 



The ventral margin of the shell is closely serrated anteriorly ^ 

 but posteriorly the teeth are arranged, as described by Prof. Brady 

 (1886), in groups of three. These grouped teeth are of a somewhat 

 remarkable nature. They appear to me to be of the nature of 

 small hyaline scales overlapping each other somewhat in the 

 manner of a hood. The sculpture of the shell is not alluded to 

 by Prof. Brady, but in the figures given b}' Prof. Daday (1898), 

 the shell is shown covered with lines enclosing lozenge-shaped 

 areas. In my specimens the shell is marked with conspicuous 

 ridges which do not intersect at all, though the}" may bifurcate 

 here and there. The form of the upper lip, with its transverse 

 ridges, is characteristic (fig. 21). 



8. Macrothrix tenuicornis , n. sp. 



Carapace of the female nearly round in outline, the posterior 

 angle very slight or altogether absent (fig. i). The shell is 

 marked with hexagonal or pentagonal reticulations which are so 

 faint as to be seen only with great difficulty. The dorsal margin of 

 the shell is quite smooth. The ventral margin is slightly serrated 

 anteriorly, but posteriori)" is rendered uneven by minute, blunt 

 teeth, rather irregularly disposed, and is fringed with long seta?. 

 The head is erect and rounded, with a conspicuous ridge over the 

 eye (fig. 22). The large upper lip begins anteriorly with a marked 

 ridge and is ridged transversel}^ as is the case in M . triserialis. 

 The eye and ocellus are small. The first pair of antennae are long 

 and nearly straight, not dilated at their extremity ; along the inner 

 edge are three large spines, while at the extremity there are two 

 semi-rings of small spines. The tail is of the usual shape, the part 

 anterior to the anus densely setiferous, the setse apparenth^ not 

 arranged in any definite plan (fig. 2). The anus is guarded by a 

 pair of peculiar flaps. Posterior to the anus the ventral edge of 

 the tail is armed with a row of very minute teeth. 



Length of female, '8 — "95 mm. 



Width, -55— -65 mm. ' • 



Found at Chakradharpur (Nos. 14, 16), 



9. Macrothrix goeldi, Richard. 



A single specimen of a Macrothrix was found in some wash- 

 ings from Spongilla carteri taken in the Museum tank, Calcutta, 



