45 



region and the branchial or " cervical " groove on either side of it plainly marked, 

 the gastric region faintly indicated. 



Front cut into 3 nearly horizontal teeth of nearly equal, size, the middle one 

 on a lower plane and slightly the most prominent. 



In young specimens a projection of the upper edge of the " orbit " marks 

 the position of the true inner supra-orbital angle of the higher Brachyura, liut in 

 large specimens tliis is obsolete. 



The true antero-lateral borders of the carapace are cut into 3 sharp but 

 coarsish spines, the 2nd of which often has a small secondary denticle at its base. 

 The postero-lateral borders are convergent and have one large coarse spine, 

 placed immediately behind the cervical groove. In addition there is a spine on 

 the summit of the infra-orbital lobule, and another at the outer angle of the 

 buccal cavern. 



The borders of the arm are dentate, especially the upper border, and there 

 are 2 or 3 teeth at the distal end of the upper border of the wrist and also alone- 

 the upper border of the hand : all these dentations tend to disappear with ao-e, 

 but two tubercles at the distal end of the outer surface of the wrist are persistent. 



The last two pair of legs are about equal in lengtli, being hardly half as lono- 

 as either of the first two pair : their propodites are much shortened and their 

 dactyli are claw-like, forming chete with the opposing sjiines at the end of the 

 propodites. 



Abdomen of male with a broad convex ridge down the middle line. 



Sternal tubercles of female very pi'ominent. 



An epipodite is present on the chelipeds. 



Distribution : Indo-Pacific Seas from the Red Sea, Mozambique, and IMauri- 

 tius, to Japan. 



1120. Persian Gulf. . . \V. T. Blauforcl, F. R. S. 



1171. Tuticorin. 5 fathoms. "Investigator" 



1527. Madras. Purchased. 



785G 



573-571 > 



7 ■ 



091 



• T"' 



3729 

 9 ■ 

 5635-56 36 

 9 



1579 



JO ■ 



3.539 



10 



Off Malabar coast. 29 fathoms. '• Investigator." 



Ceylon. Colombo Museum. 



Madras. Purchased. 



Orissa coast. 25 fathoms, " Investigator." 



Off Malabar coast. 2S fathoms. " Investigator." 



G. of Martabau. 67 fathoms. " Inyestigator." 



Off Malabar coast . ■1-9 fathoms. " Investigator." 



