424 



Pereopods III-IV are thin and approximately 1/3 longer than pere- 

 opods V. The 2nd segment of pereopods V is at least 1/4 shorter than that 

 of pereopods III and considerably shorter than the 2nd segment of pere- 

 opods IV. The length and breadth of the 4th segment of pereopods V are 



344 equal in females, while in males the width is greater than the length due 

 to the strongly bulged posterior margin, with the result that the maximum 

 width of the segment is seen in its proximal third; the width of the 5th 

 segment is more than its length in males, while in females the segment 

 is almost rectangular and generally narrower than in males; the posterior 

 proximal angle of the 5th segment projects roundly along the posterior 

 margin of the 4th segment; the anterior distal tooth is somewhat higher 

 than the medial protuberance; the medial protuberance of the distal mar- 

 gin is not high, with three-four close-set denticles on the posterior side; 

 the medial denticle is developed in both sexes; the 6th segment does not 

 project beyond the anterior margin of the 5th segment. The first pair of 

 gills is greatly reduced and approximately half the second pair in size. 



The exopodite of uropods II is equal in length to the endopodite or 

 slightly longer. The basipodites of all uropods have parallel margins. 



Distribution: This species is known from the tropics of the Atlantic 

 and Indian Oceans, the Mediterranean Sea, the Indo-West Pacific, and 

 eastern part of the tropical waters of the Pacific Ocean. 



7. Phronima pacifica Streets, 1877 (Fig. 184) 



Streets, 1877: 128; 1882: 6; Vosseler, 1901: 29; Shih and 

 Dunbar, 1963: 3; Shih, 1969: 18; Laval, 1970: 56.— sedentaria Glaus, 

 1872: 335.— co//em Vosseler, 1901: 29 (part.); Chevreux and Page, 1925: 

 396 (part.); Irie, 1957: 348 (part.); Laval, 1968b: 354 (part.). 



Length of females 6.5-14.5 mm, of males 6.5-8.5 mm. 



The antennae are well developed in males. Antennae II are approx- 

 imately 1.5 times as long as antennae I and 13- to 18-segmented. 



345 Pereopods V are shorter than pereopods' III; the 4th segment in both 

 sexes is strongly broadened and with highly bulged posterior margin, its 

 width considerably greater than its length; the 5th segment is broad, 

 trapezoid, with roundly projecting posterior proximal angle; in females 

 the segmental length is equal to its width, while in males the width is 

 more than the length; the anterior distal tooth not higher than the medial 

 protuberance of the distal margin; the medial protuberance is identical 

 in structure in both sexes, with four denticles on the posterior margin, 

 the anterior of which is separated by a notch from the others, especially 

 distinct in males, which makes it possible to distinguish them from males 

 of close species — P. colletti and P. bucephala. The medial denticle is 

 developed in both sexes; the 6th segment does not project beyond the 

 anterior margin of the 5th segment and its anterior margin has a low 

 protuberance. 



