236 CARCINOLOGICAL STUDIES. 



not only the anterior, but also the posterior, 

 the latter being also convex. The postfrontal crest 

 is as little developed as in Telphusa Goudoti and only 

 represented by two slight and low elevations , situated 

 behind the front and separated from one another, as usu- 

 ally, by the median frontal furrow ; they are often slightly 

 erose. 



The front is very narrow, its anterior margin mea- 

 suring in adult individuals only a fifth of the greatest 

 width of the cephalothorax , in younger individuals it mea- 

 sures a fourth of it. As the cephalothorax is very convex 

 from behind towards the front, this latter appears likewise 

 much inclined. The anterior margin of the front appears 

 slightly emarginate in the middle, when the cephalotho- 

 ran is seen from above, but, in fact, the median part of 

 the anterior margin is directed downwards and backwards , 

 and united with the epistome. The anterior margin of the 

 front forms with the upper margin of the orbits very 

 obtuse, rounded angles (fig. 2»). The orbits are 

 nearly circular, as they are very little broad- 

 er than high; the anterior margin of the front is 

 about once and a half as broad as the breadth of the or- 

 bits. The anterior frontal margin and the margins of the 

 orbits, the upper as well as the lower, are perfectly 

 smooth. The external angle of the orbits is obtuse , not 

 at all prominent , and therefore not tooth-like ; there 

 is no hiatus or emargination between the ex- 

 ternal angle and the lower margin of the or- 

 bits, the lower margin passing continually, without any 

 interruption , into the upper one at the external angle. 

 The epibranchial tooth is small, obtuse and situated as 

 far distant from the external orbital angle as in Telphusa 

 Goudoti. The antero-lateral margins are slightly serrate and 

 smooth, never crenulate; the postero-lateral , which are 

 not concave, are covered with many oblique wrinkles 

 passing forwards and downwards on to the inflected por- 

 tion of the carapace. The upper surface of the cephalo- 



Notes from the Leyden Museutn , Vol. XIV. 



