Py ko: an a Dr. C. Chilton on the 
large, strongly curved, its inner margin bearing a prominent 
convex process near the base, fitting into the depression in 
the palm. Peraopod 1 slightly longer than the second, 
which has the finger indented. Persopods 3 and 4 with 
basal joint oval, larger and slightly narrower in the fourth 
Fig. 10. 
Fig. 10.—Orchestia tucurauna, inferior portion of third pleon-segment. 
Fig. 11.—Orchestia tucurauna, first uropod. 
Fig. 12.—Orchestia tucurauna, second uropod, 
Fig. 13.—Orchestia tucurauna, third uropod. 
Fig. 14.—Orchestia tucurauna, telson. 
than in the third; basal joint of fifth with hind margin 
almost straight, posterior angle somewhat produced down- 
wards ; posterior margin in all serrate and with fine spinules ; 
remaining joints in all rather slender in specimens examined, 
+ 
