482 Records of the Indian Museum. [Vol. XXIV, 



long as broad, setose all round, terminal joint about one-seventh 

 of the whole scale, a prominent spine on the outer distal corner 

 of the basal joint. 



Mouth-parts agreeing with those of the genus Doxomysis as 

 described by Hansen except that the exopod of the second maxilla 

 has more setae than Hansen figures though these setae are quite 

 short and feeble ; setose lobes well developed on the second, third 

 and fourth joints of the first thoracic legs. 



Endopods of the posterior thoracic limbs very slender, tarsus 

 with three joints, the proximal articulation very oblique, the distal 

 articulation slightly oblique, nail well developed. 



Telson three quarters of the length of the last abdominal 

 somite, one and a half times as long as broad at the base, cleft 

 for one-fifth of its length, cleft armed on each side by six small 

 articulated spines, a pair of plumose setae at the base of the cleft 

 longer than the cleft, lobes at the apex truncate, each armed with 

 three spines, the outer spine stouter and twice as long as the inner 

 pair, lateral margins armed with 7-8 spines, three larger and stout- 

 er ones on the proximal portion at the widest part, 4-5 on the 

 distal portion. 



Inner uropod one and a half times as long as the telson with 

 row of about 20-25 closely set spines on the inner margin extend- 

 ing from the statocyst almost to the apex. 



Outer uropod twice as long as the telson. 



Fourth pleopods of the male with the exopod longer than the 

 endopod, the antepenultimate and penultimate joint each bearing 

 a long stout seta feathered 'at the distal end, the terminal joint 

 with a single short simple seta. 



Female with two pairs of incubatory lamellae. 



length of adult specimens of both sexes, 5*5 mm. 



Remarks.- — Hansen in his monograph of the ' Siboga ' Mysidae 

 distinguished the tribe Erythropini from the tribe Leptomysini, 

 among other characters, by the fact that the proximal articulation 

 of the tarsus is oblique. The present species, which from the 

 structure of the second maxilla, antennal scale and pleopods in 

 the male is clearly a member of the Leptomysini, presents the 

 anomalous character of two oblique articulations defining the 

 joints of the tarsus of the thoracic limbs. The proximal articula- 

 tion is very oblique, quite as oblique as in any of the Erythropini 

 but the distal articulation is only slightly oblique. 



Tribe Mysini. 



Genus Mesopodopsis Czerniavsky. 



Mesopodopsis orientalis (Tattersall). 



Mac/opsis orientalis, Tattersall, 1908, 1914, 1915. 



Locality . — Balliaghatta Canal, near Calcutta, in brackish 

 water. Abundant. 



