1922. J W. M. Tattersall : Indian Mysidacea. 483 



Bay N.-W. of Nazareth Point, Mormugao Bay, Portuguese 

 India, nine specimens. Chileolna Bay and stream at its southern 

 end, Mormugao Bay, Portuguese India, one specimen. 



Remarks . — It is unfortunately necessary to alter the name of 

 the genus. The name Macropsis, proposed by Sars in 1877, had 

 already been applied by Lewis in 1836 to one of the Hemiptera 

 and the genus must therefore be known by the name proposed as 

 a subgenus by Czerniavsky in 1882. 



Genus Neomysis Czerniavsky. 



Zimmer (1915(1)) has united with the genus Neomysis 

 Czerniavsky, the genus Acanthomysis Czerniavsky ( -= Dasymysis 

 Holt and Beaumont, Metamysis Nakazawa (not Sars), Orientomy- 

 sis Derzhavin) on the grounds that the distinctions between these 

 genera have broken down in the light of the species described by 

 Nakazawa and Derzhavin. In the structure of the pleopods of the 

 male both genera are identical and the differences lie mainly in 

 the antennal scale and in the tarsus of the thoracic legs. In 

 Neomysis the antennal scale is very long, with a sharply pointed 

 apex, and the tarsus of the thoracic legs is many jointed. In 

 Acanthomysis the antennal scale is short, the apex rounded or 

 truncate, and the tarsus of the legs three-jointed. But Meta- 

 mysis mitsukurii Nakazawa, has the antennal scale of Acantho- 

 mysis and the tarsus of the thoracic legs six-jointed, i.e. as found 

 in Neomysis. Both the species of Orientomysis described by 

 Derzhavin have many joints, 4-8, in the tarsus of the thoracic 

 legs, but the antennal scale is short with a rounded apex. On the 

 whole Zimmer appears to be right in uniting these genera. It is 

 difficult to seize upon any constant character separating them. 

 The type of the genus Acanthomysis is A. longicomis (M. Bdw.) 

 from the Mediterranean and the new species I describe below could 

 without difficulty be referred to this genus. It agrees very closely 

 with A. longicomis and is only distinguishable by characters which 

 cannot be regarded as of more than specific value. But I have 

 followed Zimmer in his arrangement and described the species 

 under the genus Neomysis. 



Neomysis indica, sp. nov. 

 Text-figs. 2oa-i. 



Localities. — Port Blair, Andaman Islands. Stations 3, 5, 11 

 and 19. Ten females and 3 males, up to 65 mm. 



Kilakarai, Gulf of Manaar, from weeds, 0-2 fathoms, February, 

 1913. Six females and 10 males up to 8 mm. (Types.) 



Chileolna Bay, and stream at its southern end, Mormugao 

 Bay, Portuguese India. One specimen. 



Description. — Very closely allied to Neomysis longicomis 

 (M.-Edw.). Body, including the eyes, and last pair of brood 



