510 



segment of pereopods VI is much broader; the 4th segment is distally 

 slightly broadened and anteriorly denticulate; the same is true of the 

 next two segments. The structure of pereopods VII is characteristic of 

 the species; the main distinguishing feature is the highly elongated 6th 

 segment which is equal in length to the 2nd. The urosome and telson are 

 generally fused. 



Notes: Since the species was not included earlier in the synonymy 

 and has certain morphological differences that compel its recognition 

 as an independent taxon, we also accept its independence. Possibly, 

 the author had examined young specimens of some other larger species 

 (shape of the head and less broadened 2nd segment of pereopods I-II are 

 characteristic of very young specimens of Oxycephalus). The structure 

 of the chelae of pereopods I-II is also the same as in O. clausi; however, 

 the styletlike distal part of the pereopods VII separates O. longipes from 

 other species of the genus. It is not clear whether this is due to devia- 

 tion in individual development or whether Spandl actually came across 

 a new, very rare species of the genus Oxycephalus. 



Absent in our collections. 



Distribution: Oxycephalus longipes was described in 1927 by Spandl 

 (Spandl, 1927) from the tropical part of the Atlantic. Since that time, this 

 species has not been reported again. 



2. Genus Streetsia Stebbing, 1888 



Stebbing, 1888: 1603; Bovallius, 1890: 46; Senna, 1902: 19; Stephensen, 

 1925a: 192; Spandl, 1927: 184; Pirlot, 1938: 368; Page, 1960: 70; Bow- 

 man and Gruner, 1973: 53. 



The body is very slightly elongated. 



The head is relatively large, equal to or longer than the pereon, its 

 maximum height in the proximal part; a neck is usually absent (excep- 

 tions are the females of S. mindanaonis with a rather long neck and males 

 of the same species with a dorsal depression in the head, not always well 

 developed, however). The rostrum is acuminate and generally shorter 

 than the proximal part of the head, which is occupied by the eyes. 



The pereon is generally longer than the pleon, or the two are equal 

 in length. The coxal plates are separated from the pereon. Pereopods I 

 have a subchela, pereopods II a more or less developed chela. The last 

 three pairs of the pereopods have a broadened 2nd and narrow distal 

 segments. Pereopods VII are well developed; the 2nd segment is as long 

 as the distal part of the limb or somewhat longer. 



The urosome is generally shorter than the pleon but sometimes 

 (5. challengeri) longer than it. The length of the 2nd (geminate) 

 urosomite exceeds its width, sometimes notably. All the uropods have 

 free rami of equal length or the endopodite is slightly longer than the 



