FAXON : NOTES ON THE CRUSTACEA. 159 



Glyphoerangon nobilis A. M. Edw.^ 



Glyphoerangon neglecta, sp. nov. 



riate I. Figs. .5, 6. 



Rostrum longer than the rest of the carapace, trending a little downward for 

 the anterior half of its length, then curving gently upward to the tip, which is 

 slender and acute ; the anterior half of the I'ostrum is distinctly carinated in the 

 median line, but the carina fades away before attaining the base of the rostrum ; 



1 The Gli/phocrangon doubtfully referred to G. nobilis in my Report on tlie Stalk- 

 eyed Crustacea of tlie " Albatross " Expedition of 1891 {Mem. Mus. Comp. Zool., Vol. 

 XVIII. p. 142, 1805) is distinct from G. nobilis, as appears from an examination of a 

 larger number of specimens of tlie latter species. In the '• Albatross " species, which 

 may be called Gli/phocraiigon vicaria, the upper surface of the rostrum is corrugated 

 on each side of the median carina, in front of the anterior pair of lateral spines ; in 

 G. nobilis this corrugation does not exist. In G. vicaria the anterior moiety of the 

 fourth or lateral crest of the carapace is broken into two parts by a deep notch; 

 the part in front of the notch is produced anteriorly to form a strong spine, wiiile 

 sthe part behind the notch merely forms a projecting angle or shoulder; in G.nobili 

 the anterior moiety of the fourth crest is continuous from the posterior end to the 

 anterior spine. The tubercles of the first and second crests are more prominent and 

 spiniform in G. vicaria than in G. 7iobilis. The dorsal carinae of the telson are den- 

 tate anteriorly in G. vicaria, simple in G. nobilis. G. vicaria is even more closely 

 related to G. lomjirostris Smith, which it represents on the Pacific side of the 

 American continent. These are the chief differences between the two species : the 

 rostrum, corrugated above in both species, is narrower in front of the anterior lat- 

 eral spines in G. vicaria than in G. lonr/irostris. The anterior moiety of the fourth 

 lateral carina is broken into two distinct parts by a notch in the former, while it is 

 merely sinuate in its outline in the latter. The tubercles on the first and second 

 crests of the carapace are more prominent and spiny in the former than in the 

 latter. The median dorsal crest of the abdomen, moreover, is more prominent. 

 These differences, though very small, appear to be constant, and afford another 

 mstance of a slight divergence between two representative forms on the Atlantic 

 and Pacific sides of the American continent. The type specimens of G. vicaria were 

 dredged in 1189 fathoms, Lat. 0° 54' N., Long. 91° 0' W., " Albatross " Station 3411. 



