12 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.60 



pairs of long strong spines, the inner pair equal in length to one-third 

 of the telson, the next pair slightly shorter and the outer pair only 

 one-fifth of the telson in length; no plumose setae on the apex. 



Inner uropods one and a half times as long as the telson with five 

 spines on the inner lower margin in the region of the statocyst; outer 

 uropods slightly longer than the inner. 



Length of immature specimens of both sexes, 7 mm. 



RemarTcs. — This species may be distinguished by the combination 

 of characters afforded by the unjointed antennal scale, the powerfully 

 developed endopod of the second thoracic limbs and the form of the 

 telson and its armature. Only one other described species of the 

 genus, M. acuta Hansen, possesses an unjointed antennal scale. In 

 all the other species the scale has a small distal portion separated off 

 by a distinct suture. In M. acuta, however, the terminal portion of 

 the scale is acutely pointed and thus differs markedly from the present 

 form in this respect. In the general form of the telson, M. higelowi 

 agrees very closely with M. Jcempii Tattersall. These two species 

 have a form of telson and telsonic armature quite distinct from those 

 of any of the remaining species. In M. Jcempii there are four pairs 

 of stout spines at the apex and in M. higelowi only three. M. Icempii, 

 however, differs from M. higelowi in having a distinct distal joint to the 

 antennal scale, in the much less robust endopod to the second thoracic 

 limbs and in the fact that the sixth joint of the endopods of the remain- 

 ing thoracic limbs is three-jointed. 



Genus NEOMYSIS Czerniavsky 



11. NEOMYSIS AMERICANA (S. I. Smith) 



Occurrence.— Station 10157, surface, abundant. 



Distrihution. — This common American species has been recorded 

 from several localities on the eastern coast of America from Massa- 

 chusetts to New Jersey, but I can not trace any previous record from 

 so far south as the present one which is from off the coast of Virginia. 

 It is, however, doubtless abundant in the shallower waters along the 

 greater part of the coast. 



Order EUPHAUSIACEA 



Family EUPHAUSIIDAE 



Genus BENTHEUPHAUSIA G. O. Sars 



12. BENTHEUPHAUSIA AMBLYOPS (G. O. Sars) 



Occurrence. — Station 10182, 1800-0 meters, 1 specimen, 10 mm. 

 long. 



ReinarJcs. — The single specimen is still post-larval and presents a 

 character not hitherto known in the genus, namely, the posterior 

 half of the lower free margin of the carapace is serrate. Serrations 



