MACROPHTHALMUS DEPRESSUS. 255 



those of cordimana Latr., hairy ou both margins, the am- 

 bulatory legs having for the rest the same shape aud struc- 

 ture as those of that Indian species. 



Measurings of our specimen: 



Distance between the external orbital angles 27\/g mm. 



Distance between the epibranchial angles 29 mm. 



Length of the carapace 22^/3 mm> 



Length of the larger hand 21 mm. 



Heigth of the larger hand 12 mm. 



Macrophthalmus depressus Rupp. 



Macrophthalmus depressus , Ruppell , Krabben , p. 19, Taf. 

 IV, fig. 6. 



Milne Edwards, Ann. Scienc. Nat. 1852, p. 159. 

 Four specimens were collected at Djeddah. This species 

 is most closely allied to Macrophth. japonicus de Haan , but 

 may be distinguished by the following: our specimens at 

 least are of a smaller size than that of Macrophth. japo- 

 nicus , the breadth of the carapace being 21 mm., that of 

 the Japanese form 32 mm., but the shape and structure 

 of the cephalothorax are nearly quite the same in both 

 species. The external surface of the hands of the male is 

 a little more convex , its inferior margin being less arcua- 

 ted and being rounded, while in Macropldh. japonicus it 

 is much arcuated, rather acute and granular. The convex 

 internal surface in the Japanese form is a little granular 

 near the articulation, but closely covered with many hairs 

 in depressus] the upper margin of the mobile finger gra- 

 nular in japonicus , but rather smooth in the other , and 

 the tooth with which its inner margin is armed, is broa- 

 der in the Red Sea form. Finally the under surface of 

 the meropodites of the three middle legs and the internal 

 surface of the tibiae and tarsi of the fourth pair are clo- 

 sely covered with hairs in depressus , but nearly smooth in 

 the other. 



ISoten from the Leyden Museuixi, ^ol. III. 



