504 



margin with complex denticulation (groups of smaller denticles occur 

 between regularly arranged, downcurved large denticles); the total length 

 of 3rd-6th segments is equal to the 2nd; the 4th segment is the longest; 

 the 4th-6th segments are armed along the anterior margin with sparse 

 strong setae with a group of fine setae between them. The 2nd segment of 

 pereopods VII is broadened proximally and markedly narrowed distally; 

 the rest of the leg is equal in length to the 2nd segment and consists of 

 virgate unornamented segments; the 4th segment is the longest. 



The lower distal angles of the epimerons are extended and pointed 

 and medial denticles absent on the lower margins of the epimeral plates. 

 The basipodite of uropods I is denticulate distally on both sides, reaches 

 the proximal part of uropods III*, and considerably extends beyond the 

 basipodite of uropods II. The endopodites of all the uropods are longer 

 and broader than the exopodites. The endopodite of uropods III is almost 

 the same length as the basipodite. The telson is elongated-triangular, with 

 denticulate sides. 



The body proportions of O. piscator vary considerably depending 

 on the size and sex of the crustacean: the head constitutes nearly 1/4 

 the body length; the pereon may be equal to or somewhat longer than 

 the pleon; the urosome in males is about 1/5 the body length, in females 

 slightly shorter; and the last urosomite is 1.5 times longer than the telson. 



The gills are normal in development; the oostegites are likewise well 

 developed and so arranged as to form a compact brood chamber under 

 pereon somites V-VI. 



Distribution: Circumtropical species, found in three oceans and in 

 the Mediterranean Sea. The form O. bulbosus is more high-temperature 

 demanding and avoids waters with very high salinity; hence it is not 

 408 found in the Mediterranean Sea where the typical form is common. 



2. Oxycephalus clausi Bovallius, 1887 (Fig. 219) 



Bovallius, 1887a: 35; 1890: 60; Stebbing, 1888: 1578; Stephensen, 

 1925a: 188; Spandl, 1927: 180; Pirlot, 1938:193; Shoemaker, 

 1945a: 251; Page, 1960: 20; Pillai, 1966: MA.—tuberculatus Streets, 

 1878: 216.— piscator Claus, 1879b: 190.— erythraeus Cecchini, 1929: 

 6. — mancinii Cecchini, 1929: 7. 



Length of females up to 38 mm, of males up to 27 mm. 



As in O. piscator, dimorphism has been observed among females, 

 which is linked with periods of sexual maturity. This difference, however, 

 is not so striking to the eye as in the preceding species. In smaller forms 

 the head is almost spherical and strongly bulged ventrally; the rostrum 

 constitutes half the total length of the head, dorsally merges smoothly 



Changed from Russian text by authors — ^Eds. 



