PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 509 



normally very sleuder, but uot inultiarticulate nor very long in either 

 sex, and that the tlagella of the anteniiiila are very long, apparently 

 much longer than the body. 



Benthonectes, gen. uov. 



This generic name is proposed for a species apparently very closely 

 allied to that figured by A. Milne-Edwards as ^^ BentheKicymus Bartletti 

 (Smith)?" and probably specifically identical with it. The genus is 

 closely allied to Benthcecetes audis specially characterized by the multi- 

 articulate flagelliform dactyli of the fourth and fifth perseopods. It is 

 further distinguished from allied genera by the acute ventral process of 

 the crowns of the mandibles and the narrow mandibular palpi ; and 

 probably, also, by the presence of an hepatic spine upon the carapax, the 

 large reniforra eyes, the equal lobes of the protognath of the second 

 maxilla?, the absence or obsolesence of the third segment of the endopod 

 of the maxilliped, the narrow nierus of the first gnathopod, and the 

 styliform dactylus of the second gnathopod. Like that of Benthcecetes, 

 the relation to Bates' imperfectly described Benthesicymus is largely prob- 

 lematical, but Bates' genus is described as having the eyes ^'not large," 

 the eye-stalks flattened and furnished with a conspicuous tubercle, and 

 the tiagella of the antennula "not longer than the carapax" (although 

 under the second species these flagella are said to be " half as long as the 

 animal"), characters which I should not expect to find in species con- 

 generic with the one here described. 



Benthonectes filipes, sp. no v. 



The carapax is similar to that of Benthcecetes Bartletti in general form, 

 but is considerably narrower and less expanded posteriorly. The dor- 

 sum is carinated or slightly angulated to near the posterior border, and 

 rising anteriorly projects forward in a rosti^um almost exactly as in that 

 species except that it is a very little longer, so as to slightly overreach 

 the eyes, and the lower edge is more nearly horizontal. The inferior 

 angle of the orbit is slightly more acute, the antennal spine a little larger 

 and a little farther forward, and there is in addition an hepatic spine 

 nearly as large as the antennal. 



The eye-stalks are relatively short, and the very dark-brown eyes, 

 large, swollen, reniform, project over the ends of the stalks and extend 

 proximally along their mesial sides more than half way to the bases of 

 the stalks, the greatest diameter of the eye being at least three-fourths 

 of the whole length of the stalk. There is a small and inconspicuous 

 tubercle on the mesial side of the stalk just back of the edge of the 

 «ye. The antennal scales are considerably narrower than in Benthce- 

 cetes Bartletti, but otherwise the antenute and autenuula? are essentially 

 as in that species. The flagella of the antennula are approximately 

 equal in length, much longer than the body of the animal and very 

 slender, while the flagellum of the antenna is very much longer and 

 almost equally slender. 



