482 



5th and 6th segments are finely denticulate along the anterior margin. 

 The 2nd segment of pereopods VII is oval; the distal segments together 

 are equal to 2/3 the length of the 2nd segment. 



The basipodite of uropods I is almost linear and has a denticulate 

 anterior margin; the rami are equal in length and half the length of 



390 the basipodite. The exopodite of uropods II is equal to the basipodite in 

 length but shorter than the endopodite. The endopodite of uropods III has 

 a bulged anterior margin and a straight posterior one. The last urosomite 

 is less in length than its maximum width. The telson is shorter than the 

 last urosomite and its length more than its width at the base. 



Distribution: Found in the eastern part of the Pacific Ocean (8° S, 

 90° W; 13° S, 86° W) in the 0-100 m layer of water. 



2. Genus Simorhynchotus Stebbing, 1888 



Stebbing, 1888: 1572; Spandl, 1927: 211; Bowman and Gruner, 1973: 

 53.— Simorhynchus Claus, 1879b: 42; 1887: 65; Bovallius 1887a: 34. 



The body is slightly compressed laterally. The head is shorter and 

 higher than the pereon, rounded, without narrowing in the distal part in 

 females, in males narrowed anteriorly. The coxal plates are free. Pere- 

 opods I and II have a poorly developed subchela; their linear 2nd seg- 

 ment is much longer than the rest of the segments together; the length 

 of the 5th segment is much more than its width. Pereopods VII have a 

 full complement of segments, urosomites I and II are fused, their width 

 more than their length. The telson is broad, triangular. The uropods are 

 as in Lycaea. 



Type species: Simorhynchus antennarius Claus, 1871. 



391 Earlier, most authors included the genus Simorhynchotus in the 

 family oxycephalidae. However, it would be logical to consider it, as 

 proposed by Spandl (1927), under the family Lycaeidae to which it is 

 closer than to Oxycephalidae in external appearance (compact body, head 

 almost without rostrum), small size of representatives, structure of the 

 legs (simple pereopods I and poorly developed subchela of pereopods II), 

 as well as in morphological type of gills and oostegites. The only impor- 

 tant character bringing Simorhynchotus close to Oxycephalidae is the 

 complete reduction of the maxillary apparatus (Barnard, 1930; Fage, 

 1960; Bowman, 1973). As is known, however, the genus Metalycaea 

 Stephensen, initially included in the family Oxycephalidae because of the 

 highly reduced maxillae, was later combined with the genus Lycaea and 

 accordingly transferred to the family Lycaeidae (Bowman, 1973). Thus 

 Simorhynchotus would not be the only genus with reduced maxillae in 

 the family Lycaeidae. In this regard Barnard's remark (1930) is interest- 

 ing: in all the specimens of Simorhynchotus examined by him from the 



