352 



Annals of the South African Museum. 



First antenna reaching a little beyond end of peduncle of 2nd 

 antenna, flagellum 13-jointed. 



Second antenna reaching to posterior margin of 5th peraeon seg- 

 ment, flagellum 34-jointed. 



First peraeopod, 3rd joint with 1 spine and 2 setae on outer apex, 

 4th joint with 5 blunt spines on inner margin. 



Second peraeopod, 3rd joint with 2 spines and 2 setae on outer 

 apex, 2 blunt spines on inner apex, 4th joint not produced externally, 

 outer apex with 2 spines, inner margin with 4 large blunt spines 

 near base, 3 at apex and 3 smaller ones between these two groups. 



The other peraeopods slender. Seventh peraeopod, 2nd joint not 

 expanded, oblong, inner margin slightly convex. 



Male stylet on 2nd pleopod slender, a little longer than ramus, 

 apex acute. 



Uropods similar to those figured by Hansen for G. cranchii young 

 ? (1890 Cirolanidae, pi. 3, fig. Si), but apex of inner ramus is 

 sub-bifid, inner margin with 10 spines, outer margin with 3 spines 

 near apex, both margins with plumose setae ; outer ramus apically 

 sub-bifid, inner margin with 5 spines, outer with 10, both margins 

 with plumose setae. 



Length : 13 mm. ; breadth : 3'75 mm. 



Colour : Whitish, tinged on back with grey, caused by numerous 

 minute stellate specks. 



Locality: St. James, False Bay. April, 1901 (Dr. W. F. 

 Purcell), and 29/4/12 (K.H.B.). 2 3 $ under stones at low-tide. 

 (S.A.M. Nos. 9856 and A2560.) 



This species is intermediate between C. parva, Hansen, and 

 G. cranchii, Leach. The former has been found in the West Indies, 

 East Indies, Ceylon, and Red Sea ; the latter is a European form, 

 but under the name of " Nelocira sivainsoni" has been recorded from 

 Senegambia by Miers (Ann. Mag. Nat. Hist. (5) 8, p. 204, 1881). 



The relationships between the three species may be best seen from 



the following table :- 



Frontal lamina 



Peraeopods 



Fourth joint of the 2nd 

 and 3rd peraeopods... 



Apices of the uropods 



Number of spines on 

 telsonic apex 



Size . 



C. parva. 



hexagonal 



slender 



not produced 

 bifid 



8 

 7-8 mm. 



C. cranchii. 



pentagonal 



stout 



produced 

 acute 



10-12 

 15 mm. 



C. ricina. 



pentagonal 



slender 



not produced 

 sub-bifid. 



13-14. 

 13 mm. 



