95 



somite I of the pereon, with a small rostrum. The eyes are narrow, reni- 

 form, and relatively large. 



Antennae I have a three-segmented peduncle; the broad weakly 

 pubescent proximal segment of the flagellum and the small distal 

 segments are nearly equal in length. Antennae II are strong and 

 considerably longer than antennae I. 



The mandibles have a narrow denticulate cutting edge; the left 

 mandible has an additional plate, almost the same width as the cutting 

 edge; the mandibular palp is strong, its 3rd segment much longer than 

 the 2nd. The inner lobes of maxillae I are narrow, papilliform. The inner 

 lobes of maxillae II are narrower than the outer lobes. The lobes of the 

 maxillipeds are broadly oval; the inner lobes are almost the same length 

 as the outer. 



The 5th segment of pereopods I and II is almost not broadened 

 distally; the 6th segment is narrowly conical, its maximum width much 

 less than its length. Pereopods V-VII or even pereopods III-VII have 

 retractile claws. 



Type species: Lanceola stephenseni Chevreux, 1920. 



This genus was established by Pirlot (1935) from the female 

 described by him as Megalanceola terra-novae. Later (1939), he included 

 this species in the synonymy for Lanceola stephenseni described by 

 Chevreux (1920), transferring the latter to the genus Megalanceola. 

 Pirlot (1939) considered that perhaps even L. felina Bovallius should 

 be included under the genus Megalanceola. However, it was later 

 demonstrated (Vinogradov, 1960a) that L. felina Bovallius is a typical 

 82 representative of the genus Lanceola and hence cannot be included under 

 the genus Megalanceola. One more species belongs to this genus, which 

 was described by Barnard (1932) as Lanceola remipes. 



KEY TO SPECIES OF GENUS MEGALANCEOLA 



1 . In pereopods III and V, 4th-6th segments not notably broad; claws on 

 pereopods III-IV nonretractile; 2nd article of mandibular palp longer 



than 3rd I. M, Stephens eni{Chtvx.). 



— In perepods III and V, 4th-6th articles very broad, oval or coni- 

 cal; claws of pereopods III-IV very small, retractile; 2nd article of 

 mandibular palp shorter than 3rd 2. M. remipes (Bar.). 



1. Megalanceola stephenseni (Chevreux, 1920) (Fig. 25) 



Chevreux, 1920: 4 {Lanceola), 1935: 137 {Lanceola); Pirlot, 1939: 



9; Shoemaker, 1945a: 2\2.— terra-novae Pirlot, 1935: 2. 



Largest of the known lanceolids. Length of sexually mature females 



up to 73 mm, of males up to 48 mm. 



