50 Records of (he Indian Mnseiwi. [\'ol. XIII, 



to the anterior portion of the fourth sternite. The anterior margin 

 of the third sternite is deeply sunk and transverse or slightly con- 

 cave. Behind the inner angles of the coxae of the third legs there 

 is, on either side, a conspicuous tubercle (text- fig. 3a). 



Between the bases of the first pleopods, both in males and 

 females, there is a large procurved tooth. 



The outer lobe of each half of the petasma (that is to say the 

 portion nearest the pleopod) is more or less crescentic in shape 

 with the antero-external border strongly thickened ; the shape of 

 this portion is similar in all four species. The internal lobe is 

 characteristic in form. At its proximal end it is truncate, much 

 expanded externally and with a small process at its inner angle. 

 Its distal portion is without any large processes, such as are found 

 in certain allied species, and appears to consist of a central style 

 surrounded by a thick coating, rather uneven in outline; its sur- 

 face has a sort of honey-combed appearance, due to the presence 

 of numerous small pits, each of which contains a modified booklet 

 (text-fig. 4a). 



The telson reaches well beyond the middle of the inner uropod 

 and is rather sharply pointed at the apex (text-fig. 5c). The angu- 

 lar termination of the lobe at the proximal end of the infero- 

 lateral margin is placed decidedlv nearer the base than the apex.' 



The ciliated and non-ciliated portions of the external border 

 of the outer uropods are separated by a prominent tooth. In 

 adults the proximal non-ciliated part is from I'l to r'3 times the 

 length of the ciliated part (text-fig. ja) : in young individuals the 

 proportionate length of the former is rather greater. 



Acetes indicus is the largest of the four species; full grown 

 females, measured from the tip of the rostrum to the tip of the 

 telson, reach a length of about 40 mm. 



The specimens examined are from the following localities: — 



"^^'^ Panvel Creek, Bombay 

 ^Y~ Market at Ennur, near Madras 

 ^^'^^-''^ Coconada, Madras Pres. 

 ^\1^' Pratapnagore, Lower Bengal 

 ^4-1^ ' Near Mud Point, R. Hugli, 

 delta 



^^ Matla R., Gangetic delta 

 10 ' » 



"["^ Bassein R. estuary, Burma 



^^ Haingyi I., off Bassein R. 



^^ S. of Purian Pt., Burma 



To^ Mouth of Rangoon R., Burma 



^*^" Green I., Amherst, Tennasserim 



^^ Mergui Archipelago, ii°28'N., 98°36' E. 



ej_ii Mergui Archipelago, i2°o' N., 98°2o' 



^\J^^ Tale Sap, Gulf of Siam 



^ As in A. eryf/i nietis. toxt-hg. ^a. 



