CARCINOLOGICAL STUDIES. 87 



than the external and separated from one another by a 

 longitudinal furrow with nearly parallel margins , issuing 

 into the mesogastric area; the external lobes are separated 

 from the internal ones by shorter and less deep grooves. 

 The whole upper surface, with the exception of the cardiac 

 and intestinal regions , is marked with a large number of 

 elevated lines , which on the gastric region have a transverse , 

 and on the branchial regions a somewhat oblique direction. 

 Similar lines exist also on the postfrontal lobes, where they 

 are more prominent; the upper surface of the front is 

 marked with a few small transverse granules. For the rest 

 the upper surface of the cephalothorax is smooth and gla- 

 brous. The lateral margins are arcuate and convex, 

 and armed anteriorly with two stout and acute 

 teeth, the anterior of which is larger than the posterior 

 and forms the outer orbital angle. 



The inferior orbital margin is minutely denticulate along 

 its whole length and presents a narrow hiatus , fissure or 

 emargination at the base of the external orbital tooth. 



The inner suborbital lobe is very small and triangular. 

 The basal joint of the outer antennae is strongly produced 

 at its antero-external angle , which is obtuse or rounded 

 and reaches as far as the inner suborbital lobe. The epistome 

 is very short. The merus-joint of the widely gaping outer 

 foot-jaws is as long as broad ; the antero-internal angle of 

 it is much produced. 



The sides of the under surface of the cephalothorax are 

 marked with oblique elevated lines; the pterygostomian 

 regions present a few minutely granulated , short lines and 

 are slightly pubescent. 



The anterior legs of the male specimen are large, 

 stout and equal. The anterior margin of the slightly con- 

 cave inner surface of the arm is produced , distally trun- 

 cate and dentate; the inner and the external sides are 

 transversely rugose. This is also the case with the upper 

 surface of the wrist, which is armed with a short acute 

 tooth at the inner angle. The hands are quite as long as 



Notes trom tlie Leyden JVXuseum, Vol. XJ.I. 



