228 



PROCEEDTNGS OF THE NATIONAL MUSEUM. 



The telson is elongate, slightly angulate and bispinose on the outer 

 margin. The extremit}^ is arcuate and bears nine or ten slender spines. 

 The outer blades of the tail fin are narrow and densely fringed with 

 line hairs; the external one is indistinctly divided near the distal end 

 by a sinuous transverse line, at the outer end of which there is a small 

 spine and at the inner a projecting angle. 



The eyestalks ai'(^ rudimentary, but seem to be considerably more 

 prominent than in such an analogous a form as Camharus 2>elhicidus. 

 They arc ([uite short when compared with the rostrum, but are not 

 hidden bv it. The distal extremity is without a trace of pigment or 

 of facets and is bluntlv conical. 



a Right lateral view of tyiie siiecii 

 h Left lateral view nf caiaiiace. 

 c Mandible. 



d Basal segments of first antenna, 

 e Basal segments of second antcni 



im HAY. 



/ Third maxilliped. 



;/ Second chelate thoracic appendage. 



/( Fifth thoracic appendage. 



( Appendage of sixth abdominal appei 



k Telson. 



The antennules are bitlagellate, the iiagellre ])eing of nearly cijual 

 length and about as long as the antennte. The basal segment of the 

 antennule is expanded somewhat so as to present toward the median 

 line a nearly horizontal blade, which at about its middle is extended 

 into a large, strong spine directed in the same line as the remainder of 

 the appendage. 



The antennie are longer than the body, exceeding it by about half 

 its length; they are verv slender; the scale is nearly as long as the ros- 

 trum, its outer margin concave and terminating in a small spine some 

 distance from the rounded extremity; the second basal segment )>ears 

 on its outer distal angle a minute slender spine. 



The third maxillipeds are pediform and in all but size quite similar 

 to the third, fourtli, and fifth walking legs. All these appendages of 

 the thorax bear a hliform exopidite, which is usually at least as long 

 as the combined lengths of the four basal segments of the appendages. 



The first and second pairs of pereiopods are so nearly equal in size 

 that it is with great doubt that I venture the statement that the second 



