63 



However, the brief diagnosis provided by Say precludes reliable 

 identification of these species. 



Lanceola say ana f. longipes, a form described by Woltereck (1909), 

 differs from the typical in that its body is dorsoventrally compressed; in 

 the typical form the body is fusiform. Pereopods VI in this form are larger 

 and the head narrower and higher. Woltereck relates these differences to 



55 the type of host on which these lanceolids live, proposing that forma typica 

 lives on larger medusae, while forma longipes is associated with smaller 

 coelenterates. It must be noted that similar differences have also been 

 observed in other species of this genus. An examination of a large amount 

 of material enabled us to find specimens with features distinctly specific 

 to both variants, as well as a large number of individuals with intermediate 

 characters that could not be reliably included in either variant. 



Distribution: One of the most common species of the family Lance- 

 olidae, it inhabits all the oceans but is not found in the Arctic Basin. In 



56 Antarctic waters it is found up to 60-64° S. Extensively eurybathic, it 

 dwells in surface layers (and even on the surface at night) but descends 

 to depths exceeding 3,(X)0 m, but more often to depths of 1,000-2,000 m. 



2. Lanceola intermedia Vinogradov, 1960 (Figs. 6, 7) 



Vinogradov, 1960a: 200, 1964: 110. 



Sexually mature individuals are not known. The size of the speci- 

 mens examined varies from 6 to 15 mm. 



The integument is dense and finely faceted. The body is smooth, 

 without keels and spines. The head has a short, broad, slightly bent, 

 overhanging rostrum. The eyes are relatively large and oval. 



In antennae I the flagellum comprises a broad short proximal seg- 

 ment and three short, unfused, flat distal segments, their width much 

 greater than their length; the apical seta is roughly equal in length to the 

 three distal segments together. Antennae II are much longer than anten- 

 nae I; the 4th segment of the peduncle distally extends into a flattened 

 lobe of variable length, longer than the 4th segment and reaching 1/2-3/4 

 the length of the 5th; the 1st segment of the flagellum is only slightly 

 shorter than the 5th segment of the peduncle. 



The mandibles have a broad cutting edge and a small spinous acces- 

 sory plate; the mandibular palp is stout, longer than the body of the 

 mandible. The lobes of maxillae II are equal in width. The outer lobes 

 of the maxillipeds are elongated-oval and well armed; the inner lobes, 

 compared to most other species of the genus, are small. 



The 5th segment of pereopods I barely broadens distally so that 

 the distal margin is only slightly broader than the base of the oval- 

 conical 6th segment. The 5th segment of pereopods II has nearly par- 

 allel margins and is much longer than the narrowly conical 6th seg- 

 ment. Pereopods III and IV are identical in structure and nearly equal in 



