ig22.] W. M. Tattersall : Indian Mysidacea. 499 



since both Kossmarm's and Bonnier' s figures were drawn from an 

 adult male and my own figure is likewise drawn from an append- 

 age belonging to that sex. 



In other respects //. proximo, agrees closely with H. harpax 

 and with H. microps from the Mediterranean. All three agree 

 in having small eyes with processes, in having only one spine 

 on the inner uropods, in having only the distal half of the margins 

 of the telson armed with spines and in the number of joints in 

 the tarsus of the thoracic limbs. The form and armature of the 

 third thoracic limbs is, however, quite distinct in all three. 



Heteromysis zeylanica, sp. nov. 

 Text-figs. 2ja-e. 



Locality. — From pools on exposed reef at Pamban, Gulf of 

 Manaar. One male, 5 mm. 



Kilakarai, Gulf of Manaar, from weeds, 1-2 fathoms. One 

 male, 5 mm., two immature. (Types.) 



Description. — Eye small, longer than broad, a short pointed 

 process on the upper distal border overhanging the cornea, latter 

 occupying less than one half of the eye in dorsal view and nar- 

 rower than the rest of the eyes. 



Antennal scale slightly shorter than the antennal peduncle 

 and considerably shorter than the antennular peduncle, three and 

 a half times as long as broad, setose all round, terminal joint 

 present. 



Third thoracic limb with the endopod moderately stout, 

 merus three times as long as broad without process at the distal 

 end of the inner margin, carpus robust, shorter than the merus, 

 twice as long as broad, inner margin armed with four or five spines 

 each with an inserted seta, penultimate joint small without 

 process, nail strongly curved about half as long as the carpus 



Remaining thoracic limbs having the endopods moderately 

 stout with the tarsus four-jointed, merus equal to the ischium and 

 longer than the tarsus, nail setiform and curved. Telson about 

 as long as the last somite of the abdomen, one and a quarter 

 times as long as broad at the base, cleft for rather more than one 

 quarter of its length, the proximal half of each margin of the 

 cleft armed with seven teeth, distal half of each margin of the 

 clefc smooth, apex rather less than one quarter of the breadth of 

 the telson at its base, each lobe of the apex furnished with two 

 spines, the inner about half as long as the outer which is about one 

 seventh of the length of the telson, lateral margins lightly concave 

 the proximal portion with five spines at the widest part, the 

 central portion smooth, the distal portion with about eight or nine 

 spines arranged at more or less regular intervals, the interval 

 between the last marginal spine and the large apical spine not 

 greater than that between the other distal marginal spines. 



Inner uropods about one quarter as long again as the telson 



