256 Records of the Indian Museum. [Vol. XIII, 



Rostral teeth slender. Rostral teeth less slender. 



Cornea of eye proportionately Cornea of eye proportionately 



smaller. larger. 



Chela of adult male not great- Chela of adult male very great- 

 ly compressed, more than twice ly compressed, much less than 

 as long as high, lower edge of twice as long as high, lower 

 palm rounded. edge of palm keeled. 



Fingers of chela of adult male Fingers of chela of adult male 



not gaping at base, armed with widely gaping at base, armed 



a regular series of teeth. with a very irregular series of 



teeth. 



Terminal segment of abdomen Terminal segment of abdo- 



of male apically pointed. men of male apically rounded. 



There are altogether about 100 specimens of this species in 

 the Indian Museum. The greater number were found in Portu- 

 guese India in September 1916 and were obtained in the Rachol 

 river at the head of Mormugao Ba}^ above Cortalim Point and in 

 the Mandavi river at Nova Goa. Some of the specimens were 

 dredged on a muddy bottom in water from i| to 4I fathoms in 

 depth, while others were found at Betim Point opposite Nova Goa, 

 living on the posts of a jetty densely covered with H^'droid. All 

 the specimens were found in brackish water, the specific gravity 

 (corrected) varying from about looio to i'oo6o. There are also in 

 the Museum a few specimens found b}^ Dr. F. H. Grav^ely in Sep- 

 tember 19 1 4 in the Cochin backwaters near Ernakulam. 



The types are from Portuguese India and bear the number 

 9735/10 Zool. Surv. Ind. 



Rhynchoplax octagfonalis, sp. nov. 



The carapace, rostrum excluded, is a trifle broader than long 

 and is distinctly octagonal in outline. The surface, in an oviger- 

 ous female, is very little sunken; it is rather closel}^ covered with 

 short hairs and the usual grooves are well defined. The margin is 

 continuous from side to side across the base of the rostrum and 

 is entire, the blunt teeth found on the antero-lateral borders in the 

 two preceding species being absent. On the side wall above the 

 base of the first pair of walking legs there is a large and sharp 

 procurved tooth (text-fig. 5). 



The rostrum in dorsal view is seen to consist of three sharp 

 isolated spines, the lateral ones a little shorter than the median 

 and directed obliquely outwards and upwards. The greater part 

 of the eye can be seen from above, together with a small but sharp 

 post- ocular tooth. 



The antennules when folded are not visible in dorsal view; 

 they are separated by a well-marked septum. The external max- 

 illipedes resemble those of the preceding species. 



The chelipedes of the female are stouter than the legs. The 

 merus does not bear any distinct teeth. The chela is not com- 



