130 



long seta; the inner lobe is broad. The outer lobe of maxillae II is armed 

 with two apical setae, the inner lobe with one seta. The maxiliipeds are 

 weak; the outer lobes are elongated-oval with a truncated apex; the inner 

 lobes narrow, with a rounded apex; each inner lobe is anned with a short 

 apical seta. 



Coxal plates I-II are rectangular. Coxal plates V-VII are oval. The 

 gills are located ventrally on somites II-VI. The length of the 2nd seg- 

 ment of pereopods I is equal to that of the 4th, 5th and 6th together; the 

 distally very weakly broadened 5th segment is equal to the conical 6th 

 segment. Pereopods II are much longer and stronger than pereopods I, 

 their 2nd segment slightly broader and the 5th segment narrower than 

 in pereopods I; the 6th segment is longer and equal to the 4th and 5th 

 together. Pereopods III and IV are equal in length and identical in struc- 

 ture; their distally slightly broadened 2nd segment is equal in length to 

 the 4th and 5th segments together; the 4th segment is 2/3 the length of 

 the 5th, which in turn is only slightly shorter than the 6th. Pereopods V 

 are equal in length to pereopods III and IV but somewhat weaker; their 

 2nd segment is shorter than the 4th and 5th segments together; the 4th 

 segment is only slightly shorter than the 5th and equal to the 6th; the 

 claw is long and slightly curved. Pereopods VI are shorter but stronger 

 than pereopods V; the 4th segment is equal to the 5th and slightly longer 

 than the 6th; the latter broadens in the middle. Pereopods VII are still 

 shorter and stronger; the width of the 2nd segment is only 1/2 its length; 

 the distally broadened 4th segment is 2/3 the length of the 5th segment, 



112 which markedly broadens in the anterior third of its length and then nar- 

 rows; the 6th segment is equal in length to the 5th thinner; the claw is 

 strong and falcate. 



The rami of the uropods are narrowly lanceolate. Exopodites of 

 uropods I and II are 1/2 and exopodite of uropods III is 2/3 the length of 

 the endopodite; the tip of both rami of all the uropods is rounded. The 

 oval-triangular telson is 1/2 the length of the basipodite of uropods III. 



Distribution: The lone specimen was found in the Pacific Ocean in 

 the deepwater Ryukyu Trench in a catch from the 4,080-5,500 m layer. 



113 2. Genus Mimonectes Bovallius, 1885 



Bovalhus, 1885a: 2, 1889: 59; Stephensen and Pirlot, 1931: 503.— Paras- 

 cina Stebbing, 1904: 20; Pirlot, 1929: 53.— Sphaeromimonectes Wolte- 

 reck, 1904b: 621, 629; 1906b: 865, 1927: 80; Pirlot, 1929: 54. 



The body has a thin integument. The head lacks a rostrum. The 

 eyes are small, poorly discernible or inconspicuous. Antennae I are long 

 and strong; the distal segments of the flagellum are well developed. The 

 mandibles lack a palp but have a developed accessory plate. The outer 



