93 



about 1.2-1.5 times longer than pereopods II. Pereopods V are nearly 

 the same length as pereopods IV; their 2nd segment is slightly shorter 

 than the rod-shaped 4th and 5th segments together; the 4th segment is 

 longer than the 5th and equal to or longer than the 6th, which in turn 

 may be longer, equal to, or slightly shorter than the 5th. Pereopods VI 

 are longer and stronger than pereopods V; their 2nd segment is much 

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

 than the 5th but slightly shorter than the 6th. Pereopods VII are shorter 

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

 the 6th is longer than each of them and sometimes almost equal to the 

 length of the 4th and 5th segments together. The claws of pereopods 

 V-VII are relatively large, retractile; in larger specimens the distal third 

 is falcate, in younger specimens almost straight. 



The Uropods have nanowly lanceolate rami and comparatively thin 

 basipodites. The telson is triangular with a roundish, rarely tapering 

 tip, reaching roughly half (rarely 3/4) the length of the basipodite of 

 uropods III. 



Notes: The similarity in structure of the appendages of L. aestiva 

 Stebbing, 1888 and S. vanhoejfeni Woltereck, 1909 together with the 

 imprecise description of the structure of the eyes of L. aestiva given by 

 Stebbing, has enabled the assumption that these two species are identical 

 (Vinogradov, 1957, 1962). A review of the type specimen of L. aestiva 

 deposited in the British Museum (Thurston, 1973) showed that it is iden- 

 tical to S. vanhoejfeni. Thus the name vanhoejfeni is relegated to a junior 

 synonym. 



Distribution: A widely distributed species, S. aestiva is known from 

 various regions of the Atlantic Ocean (from 46°29' N, 5° 18' W to 33°53' 

 S, 9°26' E), from the Indian Ocean in its tropical parts, and from Antarctic 

 waters right up to the coastal regions of the Davis Sea (65° S). In the 

 Pacific Ocean it is common in the northern parts, including the Sea of 

 Okhotsk and the Bering Sea; in the tropical regions it is not found in 

 the western part of the ocean (south of 27-30° N) but is present in notal 

 (50° S, 82° W) and in Antarctic waters (64°03'S, 161°51' E). 



It inhabits a v/ide range of meso- and bathypelagic depths. Found in 

 sectional collections from depths greater than 500 m to 2,000-3,500 m 

 but the highest frequency was recorded for the 1,000-1,500 m layer. 



2. Scypholanceola agassizi Woltereck, 1909 (Figs. 22, 24) 

 Woltereck, 1909: 167; Vinogradov, 1957: 197, 1960a: 208. 

 Sexually mature specimens not described. Specimens ranging from 



9 to 36 mm in length are reported. 



S. agassizi is very close to S. aestiva; it differs from the latter only 



in some structural details. 



