766 



ARTHROPODA 



PHYLUM VII 



The Oxyrhyncha have the carapace narrowed in front and produced into a more 

 or less distinct rostrum. Fossil forms are few and generally rather small. 



Fio. 1488. 



A, B, Ranina marestiana Ki'mis {=R. lidli Schafh.)- Eocene ; Kressenberg, Bavaria. Ventral and 

 dorsal view.s. C, Chela of 7.'. houilleana M. Bdw. Eocene ; Biarritz, Prance. 1/2- 



Micromaia Bittner (Fig. 1489), and Microthorax 



MicroiiMia tuhercvlata 

 Bittner. Eocene ; San 

 Giovanni Illarione, Italy. 

 (After Bittner.) 



lateral. Since, however, i 

 they are not separated in 

 the more recent systems of 

 classification. 



The Catometopous 

 families are not well repre- 

 sented among fossils. Litho- 

 pliylax Milne Edwards, 

 from the Upper Cretaceous, 

 is an early and somewhat 

 doubtful form. GnUnopsif^ 

 and Coeloma Milne Edwards 

 (Fig. 1490) ; Liforicola 

 Woodward ; and Palaeo- 

 grapsus Bittner, are known 

 from the Eocene and Oligo- 

 cene. The Recen.t Gecar- 



Noetling, are Eocene and 

 Miocene forms respectively. 

 The Recent Lambrus Leach 

 is known from the Eocene, 

 and Maia Lamarck from 

 the Pliocene. 



The subtribe BracJiy- 

 ihyncha includes a large 

 number of families which 

 are often divided into two 

 groups: (1) the Gyclome- 

 topa, with the carapace 

 broad and arcuate in 

 front ; and (2) the Gatome- 

 fopa, in which the carapace 

 is more or less quadri- 

 t is impossible to distinguish the two groups sharply, 



Fig. 1490. 



Coehiiiia vigil M. Edw. Eocene : 

 Laverda, Italy. 



Fio. 1491. 



Ijobocarciiius paulino viierti-mhergicus v. Meyer. 

 Mokkatam, near Cairo, Egypt. Male. 



Eocene ; 



