I9I4-] W. M. TattersalIv : Indian Brackish Water Mysidae. 79 



armed on their inner distal corners with a single very long and 

 stout plumose seta ; hirsute appendage apparentl}^ lacking in 

 male specimens. 



Inferior antenna with the peduncle about one half as long as 

 the scale, last two joints subequal. 



Antennal scale (fig. 3) about four and a half times as long as 

 broad in its widest part, extending considerably beyond the 

 distal end of the antennular peduncle, narrowly oval or lanceolate 

 in shape, setose all round, without a second joint; basal joint 

 from which the scale springs with the outer distal corner acutely 

 produced. 



Mandible with a well developed molar process ; second joint 

 of the palp linear, not expanded and unarmed ; third joint of the 

 palp comparatively short. 



First and second thoracic legs (figs. 4-5) of normal form and 

 structure, the masticatory lobes of the first pair well developed. 



Third pair of thoracic legs (fig. 6) long and slender ; tarsus 

 sHghtly longer than the merus, three jointed, the first joint the 

 longest ; nail well dev^eloped. 



Fourth and fifth pairs of thoracic tegs (figs. 7-8) similar in 

 form to the third pair but having the tarsus shorter and only two 

 jointed ; the tarsus of the fifth pair shorter than the tarsus of 

 the fourth. 



Sixth and seventh pairs of legs (fig. 9) peculiarly modified; 

 ischial joint long and slender longer than the meral joint; tarsus 

 short and robust, two jointed, second joint quite short; nail well 

 developed and rather robust, having on its inside a strong toothed 

 spine; on the lower distal corner of the first joint of the tarsus 

 there is a long and strong slightly curved spine, which, with the 

 dactylus gives the appearance of a chelate termmation to the 

 limbs. 



Eighth thoracic legs (fig. 10) long and slender ; merus longer 

 than the same joint in the sixth and seventh legs and more 

 slender; tarsus reduced to a single quite short joint, expanded 

 distally, terminating in a short curved nail; the expanded distal 

 end of the tarsal joint forms a sort of palmar edge on which the 

 dactylus can inpinge and is armed with a row of six or seven 

 short spines. 



First five segments of the pleon roughl}' subequal in length ; 

 sixth segment about one and three quarters as long as the fifth. 



Telson (fig. 13) shorter than the last segment of the pleon, one 

 third as long again as broad at the base and almost three times as 

 long as broad at the apex; latter squarely truncate, armed at each 

 angle with a single spine between which is a row of small teeth, 

 extending entirel}^ across the whole apex of the telson, some of 

 the teeth longer than the others; lateral margins of the telson 

 armed proximally with four to seven short spines, the distal 

 portion of the lateral margins unarmed, In the example figured, 

 the left margin of the telson bears only four spines while the right 

 margin bears seven 



