CARCINOLOGICAL STUDIES. 105 



margin is slightly and widely emarginate in the middle. 

 The orbits are large , and the short and thick eye-peduncles 

 project a little beyond the external orbital angles, which 

 are less prominent than in Ses. Andersoni. The four post- 

 frontal lobes are subeqaal and separated from one another 

 by shallow grooves; they project still less forward than in 

 the Mergui species. The upper orbital margin is very obli- 

 que. The lateral margins of the carapace are sharp and 

 compressed anteriorly; they run for a short distance behind 

 the external orbital angles rather parallel , but afterwards 

 converge backward rather rapidly and become slightly con- 

 cave. The sides of the upper surface are wrinkled by several 

 oblique elevated lines and the foremost of these lines pro- 

 jects a little outward beyond the lateral margin , so that the 

 latter presents a trace of a second tooth , quite as in Ses, 

 Andersoni. As regards the under surface of the cephalothorax, 

 the external maxillipedes and the male abdomen, both 

 species nearly agree with one another. 



Unfortunately, our single specimen has lost the left che- 

 lipede, so that I cannot say if they are unequal in size 

 like in Ses. Andersoni. The ischiopodite bears a small acute 

 tubercle anteriorly. The acute upper margin of the arm is 

 entire, and its distal end does not terminate in a tooth. 

 The anterior margin is dilated distally so as to form a 

 triangular crest which is minutely denticulate anteriorly. 

 The outer surface of the arm is transversely rugose. 

 The upper surface of the wrist is covered with finely gra- 

 nulated transverse lines, many of which bear short and 

 stiff black hairs , similar to those on the upper sur- 

 face of the cephalothorax. The inner angle of the wrist is 

 unarmed. The hands (fig. 13) are characteristic. As regards 

 the proportion of the horizontal length of the hand to the 

 height of the palm , our species almost agrees with Ses. An- 

 dersoni. The fingers are horizontally quite as long as the 

 palm. The slightly convex outer surface of the latter is quite 

 smooth in the middle, but covered with minutely granular 

 and somewhat hairy lines near the articulation of the wrist. 



Notes from the Leyden JMuseuxn , Vol. ^11. 



