346 Annals of the South African Museum. 



CIROLANA CRANCHII Leach. 



1818. Cirolana cranchii Leach, Diet. Sci. Nat. vol. 12, p. 347. 



1890. Hausen, Vid. Selsk. Skr. ser. 6, vol. 5, pp. 



321, 341, pi. 3, figs. 3-3/.- 

 1914. ,, vicina Barnard, Ann. S. A. Mus. vol. 10,pt. 11, p. 351a, 



pi. 30s. 

 1917. ,, cranchii Stebbing, ibid. vol. 17, pt. 1, p. 15. 



Stebbiug has expressed the opinion that vicina and also parva, 

 Hanseu might well be merged into cranchii. With regard to vicina, 

 after having examined further specimens, I am disposed to agree, but 

 not with regard to parva, which seems to be distinguished by the 

 frontal lamina and the more broadly rounded telsouic apex. 



CIROLANA FLUVIATILIS Stebb. 



(Plate XV. Fig. 19.) 

 1902. Cirolana fluviatilis Stebbing, S. Afr. Crust, pt. 2, p. 52. 



Since the frontal lamina is an important character in distinguishing 

 the species of this genus and was not described by Stebbing, a 

 description and figure of it are given here. 



In a co-type from Stebbing the frontal lamina is twice as long as 

 broad, very slightly broader anteriorly than posteriorly, sides straight, 

 anterior margin semicircularly rounded. It does not meet the anterior 

 margin of the head, the bases of the first antennae being contiguous. 



Three specimens from East London (R. M. Lightfoot, 1914, S.A.M. 

 No. A2849) and several from Zwartkops River, Port Elizabeth (Mrs. 

 T. V. Paterson, S.A.M. No. A2254), have the crenulations on the hind 

 margins of the peraeon segments and the tubercles on the pleon 

 segments almost or quite obsolete and the interrupted keels on the 

 telson very indistinct. 



On the other hand two more specimens from Zwartkops River 

 (Mrs. Paterson, S.A.M. No. A2268) show these features very clearly, 

 and the keels on the telson are composed of 5 or 6 separate elongate 

 tubercles ; consequently in this case there is a strong temptation to 

 unite this species with C. pleonastica Stebb. 



The colour of fresh specimens is a clear semi-transparent lemon- 

 yellow, but the animals are usually much coated with mud ; eyes 

 black. 



CIROLANA LITTORALIS n. sp. 



(Plate XV. Fig. 17.) 

 Body smooth. Head with a very narrow median point separating 



