36 Bulletin American Museum of Natural History [Vol. LII 



Gammaridse 

 Elasmopus species 



Station 5678. 24° 35' 20" N. 111° 59' 35" W. Magdalena Bay, 

 western coast of Lower California, March 21, 1911, 13% fathoms; 1 

 specimen. 



A single female specimen was taken at this station. As the females 

 of the genus Elasmopus show but poorly the specific characters and the 

 species of this genus belonging to the west coast of America are but 

 imperfectly known, a specific identification of this specimen would be of 

 very doubtful value. 



Aoridae 



Bemlos, new genus 



Characters of this new genus are in general like those of Lembos. Gnathopod 1 

 in male has the fifth joint short and broad, and the sixth broader and three times 

 longer than the fifth, palm transverse, short and toothed, finger overlapping palm. 

 Inner plate of maxillipeds with three teeth on upper edge. Female as in Lembos. 



Bemlos macromanus, new species 



Type Locality. — Lower California, no definite locality given; 13 specimens (1 cf 

 type). 



Male. — Antenna 1 slender and nearly as long as the body, accessory flagellum 

 composed of seven long and one short joint and reaches just beyond the sixth joint 

 of the primary flagellum. Antenna 2 normal. Mandible with 9 spines in spine-row, 

 molar with small accessory process, third joint of palp about one-third longer than 

 second, and bearing many long bristles, and on the front edge also a comb of fine short 

 bristles, second joint with bristles on front edge. Maxilla 1, inner plate with one 

 plumose seta, outer plate normal, palp normal, but bearing an oblique row of slender 

 bristles on outside. Maxilla 2 normal. Maxilliped, outer plate reaching a little be- 

 yond the middle of the second joint of palp and bearing eleven odontoid spines on 

 inner edge, inner plate, upper end truncated and bearing three short teeth at inner 

 corner, inner edge bearing a row of long plumose setae. Lower lip with long, thin, 

 pointed mandibular processes, inner lobes very large and tumid. Side-plates shallow, 

 first produced very slightly forward. Gnathopod 1, second joint stout, excavated along 

 the front margin, lower anterior corner produced to a point, fifth joint stout, broader 

 than long and somewhat triangular, sixth joint very stout, three times as long and 

 one-third broader than the fifth, widest through the middle, palm with a broad, stout, 

 setose tooth in the middle, a strong, straight tooth continuous with the hind border 

 of the joint defines the palm, the strong, curved finger overlaps the palm. Gnathopod 

 2 normal, with fifth joint slightly longer than sixth, sixth with palm oblique, slightly 

 convex and very finely toothed throughout, finger fitting palm and having a row of 

 small teeth and a few setae on the inner edge, fifth and sixth joints provided with 

 many long bristles. Peraeopods 1 and 2 normal. Peraeopods 3 and 4, side-plates 

 with front half produced downward into a lobe, second joints slightly expanded, upper 

 hind margin produced into an angular point, second joint of fourth peraeopod bearing 



