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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 41. 



as long as the last somite, inflated at the base but very slender 

 distally, the post-anal part about four-sevenths of its length. There 

 are about six pairs of rather long and slender lateral spines and no 

 apical spines at all; the telson tapers evenly from the post-anal con- 

 striction to an acute and upturned point which extends well beyond 

 the last pair of lateral spines. 



The antennules have the first segment of the peduncle nearly as 

 long as the second and third together, the second about two-thirds as 

 long as the third. The outer flagellum is composed of five segments 

 and the inner of three; the latter extends beyond the middle of the 

 second segment of the former. 



The penultimate segment of the antenna is expanded and flattened, 

 with one or two teeth on the margin ; the terminal seg- 

 ment is of moderate size. 



The mouth-parts from the mandibles to the second 

 maxillipeds appear to present no conspicuous divergences 

 from the normal type of the Diasty- 

 lidse. The third maxillipeds have 



92 93 94 



Figs. 92-95. — Oxtueostylis smithi, immature female. 92, Anterior part of body from above; 

 93, antennule and antenna; 94, third maxilliped; 95, first leg. 



the basis much expanded distally, its greatest width being nearly one- 

 third of its length along the inner edge; it is produced at the distal 

 outer corner into a bluntly pointed lobe. The ischium is produced 

 externally into a long pointed process. The merus is narrow. There 

 is a well developed exopod. 



The basis of the first leg, measured along its inner edge, is about 

 as long as the distal segments together. The carpus and propodus 

 are subequal and longer than the dactylus. The basis of the second 

 legs is about as long as the distal segments together; the carpus 

 is a trifle longer than the propodus and dactylus together. 



The posterior pairs of legs are stout. The third and fourth have 

 each a minute exopod of two segments placed unusually near the 

 proximal end of the basis and therefore very easily overlooked. 



