340 PERCY SLADEN TRUST EXPEDITION. 
40. Burystheus monuropus, sp.n. (Plate 48. fig. 8.) 
I. Praslin Reef. Coetivy. Amirante, 25-34 fms. 
II. Wasin, mud, 10 fms. 6 2. 
III. Suakim Harbour, sponges; 5 fms. Two. 
Female. 
Head: subequal to the first 2 segments; lateral lobe moderately produced, obtusely 
angular, and almost filled by the large, red, oval eye. 
Third pleon segment rounded behind, the lower margin convex; 4th segment 
depressed in front; 2 stiff dorsal setee near the hind margin of this and 5th segment. 
Ant. 1 and 2 subequal, setose, and rather more than half as long as the whole animal. 
Ant. 1: 2nd joint the longest ; flagellum 10-13-jointed, shorter than the 2nd and 8rd 
joints of the peduncle united. Accessory flagellum 5-jointed; 4th the longest, 5th 
minute. 
Ant. 2: 2nd and 8rd joints subequal ; flagellum 18-jointed, rather longer than the 3rd 
and terminated by 2 curved spines. 
Mouth-organs normal. 
Gnathopod 1: side plate rather small, produced in an acute but blunted angle, the 
margins with long setee. Limb as in Z. maculatus (Johnston). 
Gnathopod 2: ‘side plate rather small, rounded below. Second joint stout, rather 
shorter than the hand; wrist about half as long as the hand, subacutely produced 
behind, with long sete ; hand subovate, the palm rather longer than the rest of the hind 
margin, defined by a short blunt tooth, with another tooth between it and the base of the 
dactylus ; front and hind margins setose. Dactylus as long as the palm, not over- 
lapping, but slightly curved (fig. 8, gn.” 2 ). 
In the male the side plate is narrowed in front with the angle rounded. The second 
joint stout, about 3 as long as the hand; wrist very short and carpal process very 
narrow; hand, width to length as 2: 8, palm subequal to the rest of the hind margin, 
with 2 very acute teeth situated as in the female. Dactylus moderately stout and 
curved, the point meeting that of the defining tooth (fig. 8, gu.’ ¢ ). 
Perseopod 3 shorter than gnathopod 2 and upturned; 2nd joint wide-oval ; 4th and 
5th together subequal to 6th, but twice as wide; 4th longer than 5th, which is 
subquadrate; these 2 joints and the front margin of the 2nd are clothed with very long 
plumose sete. Dactylus strong, swollen near the base (fig, 8, pp.? 2 ). 
Perzeopod 4 like per. 3, but longer in all its parts. 
Perseopod 5 much longer and more slender than per. 4; dactylus not swollen at 
the base. 
Uropods 1 and 2: 1 extending beyond 2 and 2 beyond 3; rami in both subequal, 
spinous, and shorter than the peduncles. 
Uropod 3: peduncle short and tumid, subequal to outer ramus, which has 4 or 5 short 
spines on the upper surface and 3 or 4 rather long unequal setze at the distal end of the 
outer margin; inner ramus almost rudimentary, with a small terminal spine (fig. 8, -.). 
elson wider than long, with a small spine at each angle (fig. 8, w7.). 
Length of female with ova 7 mm. 
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