92 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



late, first maxillary palp uniarticulate ; eyes absent; antennae very long, 

 subequal, peduncular articles of both antennae elongated, article 2 of 

 antenna 1 longer than article 1 ; coxa 2 very broad ; gnathopod 1 

 short, with distinct palm, article 6 expanded, article 7 short, fitting 

 palm, not setose, article 4 strongly projecting posteriorly along article 5, 

 article 2 strongly setose anteriorly; palm of gnathopod 2 with a large 

 medial tooth, defining corner with large tooth ; lobe on article 2 of 

 pereopods 4 and 5 narrowing posterodistally, article 4 narrow, scarcely 

 decurrent ; telson spinose. 



Holotype: AHF No. 6013, female, 4.5 mm. Unique. 



Type locality: Station 6840, San Clemente Rift Valley, California, 

 32°-44'-35" N, 118°-12'-45" W, 1620 m, January 30, 1960. 



Relationship: This species differs from M. boeckii Sars (1895: pi. 

 88) in the presence of the medial palmar tooth on the second gnatho- 

 podal palm, the narrower distoposterior lobes on article 2 of pereopods 

 4-5, the broader second coxa and the shorter first gnathopod with a 

 more projecting fourth article and more distinct palm. 



From M. spectabilis Sars (1895: pi. 87) this species differs in the 

 equal antennae. 



Metopa alderi (Spence Bate) (Sars 1895: pi. 86) is closely related 

 and M. samsiluna may be a form of M. alderi but it differs in the 

 lack of eyes, the spinose telson, the longer antennae, the better de- 

 veloped medial palmar tooth of gnathopod 2 and the narrower disto- 

 posterior lobes on article 2 of pereopods 4-5. 



The new species resembles M. aequicornis Sars (1885), especially 

 in the long, equal antennae and large coxa 2, but differs in the nar- 

 row, scarcely decurrent fourth articles of pereopods 4 and 5 and the 

 spinose telson. 



Metopa Inyi Gurjanova (see 1951) has short articles 1 and 2 of an- 

 tenna 1. 



Metopa sp. 



(Fig. 43) 

 Material: One female, 2.2 mm, from Station 6499, Monterey Can- 

 yon. 



Relationship: This specimen has affinities with Metopa pusilla Sars 

 (1895: pi. 90, fig. 1) and may be identified with it although minor 

 differences are noted as follows: the first gnathopod is slightly stouter 

 and article 4 does not project posteriorly as much; coxa 4 is more 

 elongated antero-posteriorly. 



