242 



tubercle and on the fixed finger a corresponding excavation and bulging. The 

 carpus of the shorter claw has a strong bend outwards. 



Two males were dredged in the Andaman Sea, along with M. microps, at 

 480 fathoms. The largest measures 60 millim. from the tip of the rostrum to 

 the end of the telson, its longer cheliped measuring 142 millim. 



They are probably merely dimorphic males of M. microps. Similar 

 instances of dimorphism in the males of Munida have been noticed by Henderson, 

 A. Milne Edwards, and E. Bouvier. 



Regd. Nos. ^j^ (Types). 



16. Munida andamanica, Alcock. 



Munida militaris var. andamanica, Alcock, Ann. Mag. Nat. Hist., April 189J-, p. 3l'l. 

 Illustrations of the Zoology of the Investigator, Crustacea, Plate XIII. Fig. 2. 



But for the short chelipeds this species closely resembles the Atlantic M. 

 iris, A. M. Edw. 



The length of the carapace is very little more than its greatest breadth. 

 The uptilted rostrum is a good deal more than half the length of the carapace 

 and more than double the length of the slightly divergent supraorbital spines ; it 

 extends backwards as a faint carination of the front half of the gastric region. 

 The anterior border of the carapace on either side of the rostrum is convex and 

 slightly oblique ; the posterior border is smooth ; the lateral borders are armed 

 with 7 (2 + 3 + 2) spines. The transverse ridges are strongly developed and 

 finely and faintly beaded, and are thickly fringed with setae, some of which at 

 regular distant intervals are long. The gastric area is armed in front with a 

 convex row of spines, of which only two, namely those in the immediate rear of 

 the supraorbital spines, are conspicuous, while of the others the outermost one 

 on each side is the largest and stands far back. 



A small spinelet is present on each side immediately behind the bifurcation 

 of the cervical groove. The cardiac area is usually well defined by a zigzag 

 incision. 



The abdominal terga have the transverse ridges well developed and setose ; 

 the second only is armed, having on its anterior margin a row of 8 distant 

 spinelets. 



The eyes are large, the major diameter being between one-third and one- 

 fourth the length of the carapace; conspicuous setae fringe them and the 

 pigmentation varies from slate-grey to cinnamon-brown. 



The spines of the basal joint of the antennular peduncles are long and 

 needle-like. 



The antennal peduncles are smooth ; the basal joint has its antero-internal 

 angle produced into a spine which is not visible from above, and the second joint 



V 



