BRACHYURA. 413 



Neptunus (Amphitrite) argentatus, WHITE, 1847 A. 4, p. 36. 



Localities : Deep water off Galle, one specimen (ovigerous ? ) ; coral reefs, Gulf 

 of Manaar, two specimens (adult ? , adult c? ) ; off Kaltura, five specimens (one 

 ovigerous ? , one adult non -ovigerous ? , and three adult c? ). 



Description: C.I. of an ovigerous female = 15*50. 



Neptunus (Amphitrite) petreus, ALCOCK, 1899 -A. 4, p. 37. 



Locality : Gulf of Manaar. 



Description: A young specimen (C.I. = 5*00) which I put a little doubtfully in 

 this species. Its wrist has the strikingly elongated inner spine. A point in which it 

 differs from ALCOCK'S figure (A. Invest., pi. xlvi., fig. 2) is the still more blunt nature 

 of the frontal lobes, the notches between them being wider and shallower. 



Neptunus (Amphitrite) euglyphus, n. sp. Text-figs. 6 and 7. 



Localities : Pearl banks, Gulf of Manaar, 13 specimens (a to e and m to t) ; coral 

 reefs, Gulf of Manaar, four specimens (f to i) ; off Negombo, three specimens (j, k, /). 



Description : The association of a strong lateral production of the antero-external 

 angle of the merus of the external maxilliped with rounded posterior carapace angles, 

 and a much enlarged last spine of the antero-lateral series, show N. euglyphus to be a 

 member of the sub-genus Amphitrite (i.e., I.A.l.ii. of ALCOCK'S key. A.4, p. 31). 



Fig. 6. Neptunus euglyphus, n. sp. Fig. 7. Ventral view, external maxilliped and cheliped. 



It differs from Neptunus (Amphitrite) gladiator in the following particulars : (1) 

 The grooves which delimit the several regions of the carapace are more strongly 

 marked ; (2) the two median frontal teeth are closer together : they meet the 

 dentiform process of the epistome, so producing an appearance not unlike a single 

 dorsally grooved median tooth ; (3) the large last spine of the antero-lateral series 

 has a very characteristic appearance : it is very broad proximally, flattened dorso- 

 ventrally, and its posterior border is strongly recurved downwards and forwards ; 



