1925] Shoemaker, Amphipoda from Gulf of California 27 



Carmen Island, southeast side, Gulf of California, electric light; 14 

 specimens. 



This species was described by S. J. Holmes from the New England 

 coast of the United States and it is now recorded for the first time from 

 the western coast of America. 



(Edicerotidse 

 (Ediceropsoides, new genus 

 Female. — Rostrum or frontal process long and narrow. Eyes absent. Lateral 

 lobes of head produced and truncated. Antenna 1 well developed, not short. Antenna 

 2 about half the length of the body, fourth joint of peduncle large, flagellum of many 

 calceoliferous joints. Upper lip with margin evenly convex. Mandibular palp 

 elongate. Maxilla 2, inner plate much wider than outer. Plates of maxillipeds rather 

 broad in proportion to length. Side-plates 1-4 rather large, first expanded distally, 

 fourth with hind margin slightly concave. Gnathopods 1 and 2 very much alike but 



2 a little the larger, fifth joint large with prominent setose lobe, sixth joint longer than 

 fifth, ovate, palm much longer than hind margin. Perseopods 1 and 2 rather feeble, 



3 and 4 strong, 5 long. Pleon segments 1-3, postero-lateral corners very rounding. 

 Abdominal segments 4-6 missing from the single specimen dredged. 



(Ediceropsoides abyssorum, new species 

 Type Locality.— Station 5689. East of Guadalupe Island: Hat Mt., N. 59° 

 E.; St. Yincent Peak, N. 47° E. (29° 32' N., 116° 14' W.), 879 fathoms; 1 specimen. 

 Female. — Head about as long as the first three segments of body, rostrum long, 

 narrow, evenly rounded at apex, curved slightly downward and reaching just to the 

 end of the first joint of antenna 1, lateral lobes prominently produced forward and 

 obliquely truncated. Eyes absent. Antenna 1 reaching to the end of the fifth joint 

 of antenna 2, flagellum equal in length to the peduncle. Antenna 2, fourth and fifth 

 joints long, fifth about four-fifths as long as fourth, two long curved spines on inside 

 margin and three at the distal end. Flagellum nearly as long as peduncle, composed 

 of many short calceoliferous joints. Upper lip evenly rounded on lower edge. Man- 

 dible short and stout, cutting-edge with few teeth, small, dark tooth at base of cutting 

 edge, eight teeth in spine row, molar very prominent with triturating surface concave, 

 palp long, third joint nearly as long as second, second and third joints provided on their 

 lower edges with a row of spines. Maxillse 1 and 2 nearly as in CEdicero-psis brevicornis 

 Lillj. Maxillipeds much as in (E. brevicornis Lillj., except that the outer plate and the 

 second joint of the palp are comparatively broader. The distal edge of the palp 

 of maxilla 1, the distal edge of the inner and outer plates of maxilla 2, the inner 

 edge of the outer plate of maxillipeds, and the inner edge of the second joint and the 

 distal edge of the third joint of the palp of maxillipeds are provided with elongate, 

 cylindrical appendages, which become very easily detached. Side- plate 1 greatly 

 expanded and extended straight forward. Side-plate 2 comparatively narrow with 

 sides nearly parallel. Side-plate 3 much broader than 2, with sides nearly parallel. 

 Side-plate 4 deeper than 3, front margin convex and hind margin slightly concave. 

 Side-plate 5 a little over half the depth of 4, front lobe much larger than hind lobe. 



