70 MACROPHTHALMUS BREVIS. 



structure ; yet the transverse furrows on the antero-lateral 

 regions are always deeper , but the two verrucous tubercles 

 ou the branchial regions are found in both species. The 

 point of the external orbital angle is directed obliquely 

 forward and projects as much as the upper margin of the 

 orbits , while it is situated behind that margin in Macrophth. 

 (lilatatus. But these two species may be distinguished im- 

 mediately by the shape of the chelipedes : the upper mar- 

 gin of the arm being provided with some (3 or 4) small 

 sharp teeth in Macrophth. dilatatus, but only minutely 

 granulated in the other species. The hands of Macrophth. 

 earinimamts are very slender , with an almost smooth outer 

 surface; on the lower part of it passes the strong crest 

 that proceeds upon the immol)ile finger; the upper mar- 

 gin is however somewhat minutely granulated, the inner 

 surface for a part very hairy ; the fingers are much shorter 

 than the palm of the hand. In Macrophth. cUlatatus on the 

 contrary the hands are not very slender , with a very granu- 

 lated upper surface, which is separated by a transverse 

 ridge of larger granules from the smooth middle part of 

 the outer surface of the hand; tlie granular strong crest 

 on its lower part occurs also in this species and borders 

 the smooth middle part below ; the fingers are nearly as 

 long as the palm and the index is more arched. 



In one specimen, a male, the two anterior teeth ot the 

 lateral margins of the carapace are situated closely to one 

 another and almost in contact. 



Breadth of carapace of a male of Macrophth. carinima' 

 nus (the distance between the points of the second lateral 

 teeth) 22^2 i^i^u. . length (without the front) 8^2 nim- ; 

 length of the hands 20 mm. 



Breadth of carapace of a male of Macrophth. dilatat,u,'< 

 27 mm., length ll'/s mm., length of the hands 19 mm. 



Macrophthalmus brevis Herbst. 



Herbst , Krabbe und Krebse , Taf. LX, fig. 4. — Hilgen- 

 dorf, 1. c. pag. 86, Taf. Ill, fig. 4. 



Notes fvoiw the Leyden Miuseiim , "Vol. H. 



