230 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
PuateE 22 (B). 
Exospheroma reticuiatum, sp. na. 
n.s., 2.S8.¢. Line to the left indicating natural size of specimen represented in dorsal view ; 
line to the right indicating natural size of a male specimen from which the 
details were figured. 
Pl. §. Pleon and uropods of male. 
a.s., a1. First and second antennee. 
L.s., Li., m.,m., mx. 1, mx.2, mvp. Upper and lower lips, mandibles, first and second maxill, 
and maxillipeds. 
gn.1, prp.5. First gnathopod and last five joints of fifth peraeopod. 
plps. The first and second pleopods seen from the underside, along with the genital 
papille of the seventh perzeon segment. On the left the first pleopods are 
indicated without sete, and the second pair are detached. 
All the details, except the pleon and uropods, are drawn to a uniform scale. 
PLATE 23. 
Tylos exviguus, sp. 1. 
n.s. Lines indicating natural size of specimen figured below. 
Pl. Dorsal view of pleon. 
v.d. Ventral lamina of fifth pleon segment. 
a2. Second antenna. 
is. Upper lip, with epistome and scutellum. 
m., m. The mandibles. 
(ct. Lower lip. 
g. The stomach. 
me. 1, mx.2, mxp. First and second maxille and maxillipeds. 
gn. 1, prp. 5. First gnathopod and fifth perzeopod. 
plp. Second pleopod. 
urp., urp. The uropods, one on the right from the ventral side, that on the left from the 
upper side. 
