72 PODOPHÏHALMOUS CRUSTACEA. 



This species belongs also to the genus Heterograpsus 

 M. Edw. and is even closely allied to H. sanguineus de 

 Haan. The males of both species may be distinguished 

 at once by the thick clothing of coarse hairs on the claws , 

 but it is more difficult to distinguish the females. The 

 infraorbital margin which is very thin and minutely crenu- 

 lated passes without an interruption , but has quite another 

 appearance in H. penicillatus', in this species it is inter- 

 rupted near the extraorbital angle and proceeds again after 

 that interruption; on both sides of that interruption this 

 margin is thickened locally. Heterogr. penicillatus de H. 

 is also nearly allied to Heterogr. harhimanus Heller (Novara- 

 Reise , p. 53 , tab. lY , fig. 5) , but this last species has a 

 more narrow front. 



24. Hypsilograpsus Deldeni n. g. n, sp. 



This crustacean has its external maxillipeds quite similar 

 to those of the genus Gnathograpsus Alph. M. Edw., but 

 it may be distinguished by the very thick body , the very 

 convex carapace and the very deflexed front. By these dif- 

 ferences it has too different a physiognomy from Gnatho- 

 grapsus to be ranged in the latter genus. 



The carapace very thick, convex, having a square shape 

 with rounded angles and with but little arched lateral mar- 

 gins ; its upper surface is everywhere granulated , especially 

 on the anterior and lateral regions , and also covered with 

 a few very minute short hairs. The interregional grooves 

 are very distinct and deep, the transverse middle furrow 

 making at its ends with the longitudinal grooves a figure 

 almost like an H. The carapace is much deflexed 

 anteriorly, the front is a little less broad than half 

 the breadth of the carapace and is bayed three times , in 

 the middle and at the sides , so that its border is sinuous. 

 The antero-lateral margins are armed with three very distinct 

 teeth ; the margins of these teeth like those of the front 

 and of the orbits are ornamented with granulations. The 



Notes from the Leyden Miuseuin. 



