South African Crustacea. 15 



OXYSTOMATA. 



1841. Oxystomata, de Haan, Crust. Japonica, decas quinta, 



p. 111. 

 1896. Oxystoma, Alcock, Journ. Asiat. Soc. Bengal, vol. Ixv., pt. 2, 



p. 135. 

 1902. Oxystomata, Stebbing, South African Crustacea, pt. 2, p. 16. 



FAMILY EANINID^. 



1896. Raninidce, Alcock, Journ. Asiat. Soc. Bengal, vol. Ixv., pt. 2, 

 pp. 136, 288. 



Alcock characterises the family as follows : " Carapace remarkably 

 elongate, but not covering the abdominal terga, the first four or five 

 of which lie exposed in the dorsal plane of the body. The last pair 

 of legs also is raised in the dorsal plane of the body. The antennae 

 are large. The antennules also are large, and do not fold into 

 fossettes. The vasa deferentia protrude through the bases of the 

 fifth pair of legs ; the oviducts pierce the bases of the third -pair of 

 legs. The sternum is broad anteriorly, very narrow or linear 

 posteriorly. The afferent branchial openings are not found in front 

 of the bases of the chelipeds, and afferent currents probably reach 

 the branchial chamber between the posterior border of the carapace 

 and the bases of the last pair of legs. The external maxillipeds 

 completely cover the buccal cavern, and their palp is concealed in 

 repose : their exopodite is but little longer than the ischium. The 

 branchiae are less than nine in number on either side." 



GEN. EANINA, Lamarck. 

 1801. Ranina, Lamarck, Syst. Anim. sans vertebres, p. 156. 



Lamarck includes the genus in his section Cancri Macrouri. He 

 defines it as having " Four short antennae : the inner pair with the 

 last joint bifid. The body oblong, wedge-shaped, truncate anteriorly; 

 tail small, ciliated on the edges. Ten feet; the anterior pair ending 

 in claws ; the four hinder pairs ending in swimming-blades." He 

 assigns to it the single species Ranina serrata, a new name for 

 " C. Raninus, L., Rumph. Mus., t. 7, fig. T, V. Herbst, Cancr. 

 t. 22, f. 1." Latreille regards the genus as the last of the 

 Brachyura, and so leading on to the Macrura. 



