Crustacean Fauna of South Africa. 107 
1908. Trischizostoma id. S.A. Crust. pt. 4, p. 59. 
1908. Pei Sexton, Proc. Zool. Soc. Lond. 1908, pt. 2, 
p. 370. 
TRISCHIZOSTOMA PAUCISPINOSUM 0. sp. 
(Plate XXVI. Fig. 1.) 
Head plus rostrum a little longer than Ist peraeon segment, rostrum 
triangular, broader than long, apex subacute, curved downwards. 
Eyes large, occupying the greater part of the lateral portions of the 
head, reniform, not extending above and not nearly meeting on top 
of head. 
Second peraeon segment a trifle shorter than the first and the 
following segments. Side-plate 1 small, triangular, almost completely 
hidden by 2, which is a little deeper than long, 3 also a little deeper 
than long, larger than 2, 4 a little larger still, almost circular, the 
anterior, inferior and hind margins forming a nearly even curve, 
- posterior margin excised for 5, which is longer than deep (longest 
of all the side-plates) and bilobed, 6 a little shorter than 5, 7 large, 
triangular, deeper than long. 
Pleon segment 4 hollowed at base, pleuron of Ist narrowed below 
and ending in a small acute point at the postero-lateral angle, of 2nd 
large, inferior margin straight or slightly emarginate, postero-lateral 
angle acute, inferior margin of 3rd convex, postero-lateral angle acute, 
the posterior margin sinuous above the angle. 
Telson a little longer than broad, slightly tapering, cleft to centre, 
the apices obtuse. 
First antenna reaching to about 6th peraeon segment, 2nd and 3rd 
joints together equal to half length of Ist, flagellum 20-jointed, Ist 
jot nearly half as long again as whole of peduncle, its anterior 
margin densely setose, accessory flagellum 3-jointed, Ist joint { 
length of Ist flagellar joint, lanceolate, with a few widely spaced setae 
on both margins, 2nd and 8rd joints very slender, 3rd 4 length 
of 2nd. 
Second antenna reaching to about end of 3rd pleon segment, 5th 
joint twice length of 4th, flagellum at least twice length of peduncle, 
ca. 40-jointed. 
Mandible, trunk distally from palp of more or less even width 
throughout, cutting edge straight, the angles rounded, palp long, 2nd 
and 8rd joints subequal, 2nd not or scarcely broader than 3rd, inner 
margins of both setose. 
