382 



5. Fused somites of pereon divided dorsally by groove. Sixth segment 



of pereopods I and II with one spine on anterior margin 



2. L. shoemakeri Bowm. 



— Fused somites of pereon not divided dorsally by groove. Sixth seg- 

 ment of pereopods I and II with one-two spines on anterior margin . . 



5. L. latissimus (Bov.). 



Males 



1 . Only somites I and II of pereon fused 2. 



— Somites I-IV of pereon fused 6. L. bengalensis Giles. 



2. Curved denticulate tooth present on distal margin of 6th segment of 

 pereopods V-VII 3. L. crucipes (Bov.). 



— Distal margin of 6th segment of pereopods V smooth; smooth spine 

 present on pereopods VI-VII 3. 



3. Apex of antennal gland round, not extending to lower margin of 

 mouth cone 4. 



— Apex of antennal gland acute, extending to or almost reaching lower 

 margin of mouth cone \. L. schizogeneios (Stebb.). 



4. Length of head more than half its height 



4. L. macrophthalmus (Vos.). 



— Length of head less than half its height 5. 



5. Additional mandibular plate with seven-eight denticles. Outer lobes 

 of maxillipeds with two apical setae 2. L. shoemakeri Bowm. 



— Additional mandibular plate with ten denticles. Outer lobes of max- 

 illipeds with three apical setae 5. L. latissimus (Bov.). 



1. Lestrigonus schizogeneios (Stebbing, 1888) (Fig. 162) 



Stebbing, 1888: 1391 (Hyperia); Bouallius, 1889: 221 (Hyperia); 

 Chevreux, 1892: 233 (Hyperia); 1900: 139 (Hyperia); Vosseler, 1901: 66 

 (Hyperia); Stephensen, 1924: 86 (Hyperia); Chevreux and Fage, 1925: 

 402 (Hyperia); Irie, 1957: 351 (Hyperia); Yang, 1960: 15 (Hyperia); 

 Vives, 1966: 19 (Hyperia); Yoo, 1971: 56 (Hyperia); Bowman, 1973: 

 39.— promontorii Stebbing, 1888: 1385 (Hyperia); Bovallius, 1889: 214 

 (Hyperia); Dakin and Colefax, 1940: 207 (Hyperia). — zebui Stebbing, 

 1888: 1394 (Hyperia).— bengalensis (non Giles, 1887); Pirlot, 1939: 35 

 (Hyperia); Hurley, 1955: 137 (Hyperia); Reid, 1955: 17 (Hyperia); Kane, 

 1962: 299 (Hyperia). 



Length of sexually mature males 3.5-4.5 mm, of females 

 2.2-3.5 mm. 



The length of the head is half its height and half the length of the 

 pereon. Somites I-III of the pereon are fused in females, somites I-II in 

 males. The cone of the antennal gland is well discernible in females, 

 apically acute and projects beyond the mouth cone; in males it is more 

 obtuse and does not extend to the lower border of the mouth cone. The 

 mandibles have eight denticles on the cutting edge and six-eight denticles 



