I04 Records of the Indian Museum. [Vol. X, 



According to Miss Rathbun' Stimpson's Rhynchocyclus 

 mucronatus is synonymous with Latreutes planirostris (De Haan) ; 

 but no reasons are advanced for this view and Stimpson appears 

 to have had both species before him when writing in i860. The 

 Indian specimens differ widely from L. planirostris as figured and 

 described by De Haan.^ 



^f^^ Kilakarai, Ramnad Dist., S. India. "^^ Kpmn f Twenty nine, 

 _8|i3 Pamban, Ramnad Dist.. S. India. > ^- ^- I 9-i3'5 mm- 



The specimens were obtained in February, 1913, among weeds 

 in water only a few feet deep ; the females are ovigerous. 



Latreutes mucronatus has been recorded from Sagami Bay, 

 Japan (Doflein), Hongkong (Stimpson), Java (Nobili, sub var. 

 multidens), the S. E. coast of Arabia and the Red Sea (Nobili, sub 

 var. multidens and L. gravieri). 



Latreutes anoplonyx, sp. nov. 

 Plate IV, figs. 3 — 5. 



This species, founded on a single adult female, is readily 

 distinguished from the two preceding by the simple claw-like 

 dactyli of the last three peraeopods. 



The specimen is robust in build. The carapace is not carinate 

 mid-dorsally, but bears a single prominent fixed tooth in the 

 middle of its anterior third. The antennal spine is strong and 

 there is a series of eleven small spines on either antero-lateral 

 angle (fig. 3). 



The rostrum is triangular in shape; it reaches beyond the 

 apex of the antennal scale and is rather more than three-quarters 

 the length of the carapace ; its greatest height in lateral view is 

 rather more than one-third its extreme length from the back of 

 the orbit. The dorsal margin is concave (the apex being directed 

 obliquely upwards) and bears thirteen teeth in the distal two- 

 thirds of its length; the inferior margin is evenly curved and is 

 furnished with nine teeth in its distal half. The extreme apex is 

 broken off and on it one or two additional teeth may have been 

 situated. 



On the eyestalk there is a lobe similar to that found in the 

 preceding species, but much less conspicuous. 



The antennular peduncle is very short, reaching to little more 

 than one-third the length of the antennal scale. The lateral 

 process is rounded and the second segment is broader than long. 

 The stout upper antennular ramus reaches (in the female) almost 

 to the end of the scale. The antennal scale (fig. 4) is pointed 

 anteriorly and is about four times as long as wide. 



1 Proc. U.S. Nat. Mus., XXVI, p. 46 ( 1902). 



'^ In Siebold's Fauna Japonica, Crust., p. 175, and atlas, pi. xlv, fig. 7 

 (1843-9,. 



