10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



4; submarginal medial row of setae on postero ventral edge of article 

 2 on pereopod 5 more densely packed than in American population; 

 notch and distal end of article 5 v/ith slight ochraceous bulbosities 

 appearing almost lenslike; posterior edges of articles 6-7 with row of 

 small pits similar to stridulating ridges; coxae 1-3 each with 1 small 

 postero ventral slit; peduncle of uropods 1 and 2 without ventro- 

 lateral setules occurring on continental American specimens. 



Remarks: The members of this one population are consistent in 

 the condition of their third uropods as reflected by the accompanying 

 illustration, unlike the variation shown for A. schellenbergi by J. L. 

 Barnard (1954a), and none of the young males has any sexual 

 differentiation on uropod 3. 



The Hawaiian population of this species has been compared with 

 Caribbean samples used by Shoemaker in his description of the 

 species and with samples from the eastern Pacific Ocean described 

 by J. L. Barnard (1954a). The scabrous condition of pereopods 

 3-4 noted in the Hawaiian specimens and the ornamental pits of 

 pereopod 5 also occur in the others. Individuals from aU 3 areas 

 have a few serrate spines in the distal groups on article 5 of pereopods 

 3-4. 



Distribution: Hawaiian Islands, "93-229" m; eastern Pacific Ocean 

 from Laguna Beach, Calif., to Lorenzo Island, Peru, 0-"128" m, but 

 probably rare in depths esceeding 40 m; western Atlantic Ocean from 

 Florida, Yucatan, and Panama, 0-46 m. 



Ampelisca shoemakeri J. L. Barnard 



Ampelisca shoemakeri J. L. Barnard, 1954a, pp. 39-40, pis. 27-28; 1964a, p. 216. 



Material: Albatross 2837 (29). Schmitt 10 (2). 



Records: Cedros Island, Baja California, 23 fms; north of Paita, 

 Peru. 



Distribution: Eastern Pacific Ocean from Cedros Island, Baja 

 California, to Paita, Peru, 7-76 m. 



Byblis albatrossae, new species 



Figure 2 



Diagnosis of female: Head with distinct rostrum about one-third 

 as long as article 1 of antenna 1, anterior cephalic margin with strong 

 angular protrusion, anteroventral cephalic margin deeply excavate 

 for reception of antenna 2; ventral pair of corneal lenses situated at 

 and forming rounded anteroventral cephalic angle, arranged so as to 

 point obliquely anteroventrally, dorsal pair of lenses enormous, about 

 1.5 times as large as ventral pair, protruding strongly; antenna 1 

 nearly as long as peduncle of antenna 2, article 2 more than twice as 

 long as article 1 and more than half as long as article 4 of antenna 2 ; 



