Contributions to the Crustacean Fauna of South Africa. 425 



1893. Palaegyge, Stebbing, Hist, Crust, p. 410. 



1900. Bonnier, Trav. Stat. Zool. Wimereux, vol. 8, p. 332. 



1910. ., Horst, Notes from Leyden Mus. vol. 32, No. l,p. 67. 



1912. Richardson, Proc. U.S. Nat. Mus. vol. 42, p. 521. 



PALAEGYGE PLESIONIKAE n. sp. 

 (Plate XVII. Figs. 24, 25.) 



Female. Head a little wider than long, anterior margin straight 

 or slightly concave, " limbe posterieur " entire, each of its exterior 

 angles produced into a rather stout, curved process. Ovarian bosses 

 on first 4 peraeon segments ; epimera not conspicuous, not developed 

 as lamellae on the last 3 segments. Pleon of 6 distinct segments, the 

 last entire ; pleurae entire, not greatly developed, not concealing the 

 outer rami of pleopods. 



Antenna 1 3- jointed, basal joint stout, completely separated from 

 its fellow by the triangular frontal plate, with apical tuft of setae. 



Antenna 2 7-jointed, basal joint stout, distal 2 joints minute, with 

 apical tuft of setae. 



Maxilliped divided into two portions by an oblique suture, anterior 

 portion quadrangular, postero-exterior angle produced backwards into 

 a long curved process, palp rather large, strongly setose, posterior 

 portion subtriangular, antero-interior angle produced. 



The five pairs of marsupial plates overlap in the centre. First pair 

 with the distal lobe produced backwards in a blunt process. The 

 margin of the overlapping ridge has three, small indentations. The 

 hind margins of all the pairs, except the first, fringed with setae, those 

 on the 5th being strong and conspicuous. 



Pleopods increasing successively in length and diminishing in 

 thickness posteriorly, the outer rami larger than the inner, both 

 smooth. 



Uropods slightly curved, tapering, with blunt apices. 



Male. Lanceolate in outline, head broader than long, anterior 

 margin evenly rounded, eyes small but distinct. Peraeon segments 

 all distinct, laterally rounded. Pleon segments also distinct, the 

 lateral portions directed backwards, the 6th segment triangular, with 

 a few short spines on postero-exterual angles. 



Antenna 1 3- jointed, basal joint large, not contiguous with its fellow, 

 with apical tuft of setae. 



Antenna 2 7-jointed, basal joint not very enlarged, 6th and 7th 

 minute, with apical tuft of setae. 



