228 Records of the Indian Museum. [Vol. XIII, 



upper border bearing many close-set teeth. The rostrum begins 

 as a carina in the middle of the carapace and its upper border is 

 sharply ascendant up to a point immediately over the eye; in 

 front of this it drops steeply to the apex, which is straight, nar- 

 row and produced. The margin between the highest point and 

 the apex is concave The teeth on the upper border vary in 

 number from 13 to 16/ of which from 4 to 6 (usually 4 or 5) are 

 situated on the carapace behind the level of the orbit. The teeth 

 are fixed and evenly spaced and the interstices between them are 

 filled with hairs. The lower margin is convex, but is not greatly 

 expanded : the depth of the inferior portion of the blade is con- 

 siderably less than half the depth of the upper portion. The lower 

 margin bears i, very rarely 2 teeth* in the distal half of its 

 length. 



The carapace is smooth. The antennal tooth is well-formed 

 and from its base a strong carina runs backwards and downwards 

 to the base of the hepatic tooth. The latter is large and beneath 

 and behind it there is a shallow groove. A depression defines the 

 upper posterior limits of the branchial region and there is a faint 

 longitudinal groove on either side of the cardiac area. 



The eye is short and somewhat depressed. The "ocellus" is 

 rather large and is broadly in contact with the cornea (pi. x, fig. a). 



The antennular peduncle does not differ materially from that 

 of typical Palaemcn. The basal segment is rather slender and 

 the keel near the inner edge of its lower surface bears the custom- 

 ary tooth in its proximal half ; the outer margin terminates 

 anteriorly in a sharp tooth extending far beyond the produced 

 lateral portions of the segment. The second segment is less than 

 two thirds the length of the third. The accessory flagellum is 

 conspicuously serrate externally and is about as long as the peduncle ; 

 it is fused basally with the outer branch for a distance not equal 

 to half the length of the last peduncular segment. 



The antennal scale (pi. x, fig. b) is about three times as long 

 as wide. Its outer margin is straight and ends in a sharp tooth 

 which does not reach nearly as far forwards as the apical portion 

 of the lamella. 



The oral appendages do not appear to differ in any note- 

 worthy feature from those of Palaenion or Leandcr. The man- 

 dible bears a three-segmented palp, the last segment being almost 

 as long as the two basal ones combined ; the incisor-process ends 

 in three large teeth. In the second maxilla the two lobes that 

 form the distal lacinia are rather narrower than is usual. The 

 first maxillipedes possess a bilobed epipod and the second an 

 epipod with a podobranch attached. The third maxillipedes 

 reach about to the middle of the antennal scale The exopod 



1 Of fifty specimens five ha\-e 13 dorsal teeth, thirteen ha\e [4, twenty-three 

 have 15 and nine have 16. 



2 Of fifty specimens forty-eight have a single ventral tooth, whilr two have 

 2 teeth. 



