90 



eye cup cannot be taken as a specific character; hence S. aestiva and 

 S. richardi should be considered synonyms. Barnard (1932) considered 

 that S. chuni should also be considered a synonym of S. aestiva. This 

 view was later supported by Pirlot (1939). The material at our disposal 

 likewise revealed no specific distinctions among these three species, 

 enabling us thereby, following Barnard and Pirlot, to consider them 

 identical. 



The differences of S. agassizi from the above-cited species are also 

 not great and some researchers have proposed (Pirlot, 1939) that this 

 species is identical to S. aestiva. However, our examination of the new 

 material from the "Vityaz" collection showed that S. agassizi possesses 

 78 several constant characters that differentiate it from S. aestiva and deter- 

 mine its species independence. True, only the large, undamaged speci- 

 mens could be considered reliably identified. 



KEY TO SPECIES OF GENUS SCYPHOLANCEOLA 



1 . Head with a small tapering rostrum. Apical segment of antennae I 



elongated-oval \. S. aestiva (Stebb.). 



— Head without a tapering rostrum. Apical segment of antennae I 

 elongated-conical, narrowing distally 2. 5. agassizi Wolt. 



1. Scypholanceola aestiva (Stebbing, 188,8) (Figs. 22, 23, 24) 

 Stebbing, 1888: 1309 (part.) (Lanceola). — vanhoeffeni Woltereck, 

 1909: 161, 1927: 65; Pirlot, 1939: 8 (part.).— clausi Woltereck, 

 1909: \6\.— richardi Chevreux, 1920: 10, 1935: 139; Pirlot, 1930: 45. 



Length of the sexually mature females in our collections from 27 to 

 53* mm, of males from 30 to 35 mm. But Woltereck found a specimen 

 measuring 61 mm (5. chuni) in the Southern Ocean. 



The body has a thin transparent integument; the pereon bulges 

 markedly; the somites of the pleon have weakly developed, blunt dorsal 

 denticles. The head is short and high with a small, straight, tapering 

 rostrum. The eye cups are large, shallow, and occupy the entire lateral 

 surface of the head; the crest between the upper and lower cups broadens 

 in the anteroposterior plane but is generally fairly narrow; the bottom of 

 the cups (even in freshly caught specimens) lacks a metallic sheen. 



5. aestiva is similar to Lanceola loveni in structure of the 

 appendages. Antennae I are longer than somite I but shorter than 

 somites I and II of the pereon together; the proximal segment of the 

 flagellum is elongated-conical, narrow, and slightly bent; its tapering 

 margin is variably pubescent (usually weakly) and the inner proximal 



Changed from "43" in Russian text by authors — Eds. 



