88 



curved, narrow, less than 1/3 the width of the 5th, its length slightly less 

 than that of the 5th segment; the claw is almost straight, 2/7-1/3 the 

 length of the 6th segment. Pereopods IV are similar in structure, the 5 th 

 and 6th segments only slightly longer than in pereopods III. In juvenile 

 specimens the 5th segment of pereopods III and IV is relatively nar- 

 rower than in adults but the amygdaloid shape is retained. Pereopods V 

 have a well-developed subchela formed by the bulging palmate margin 

 of the 6th segment and the claw; the 2nd segment is equal in length 

 to the 4th and 5th together; the distally broadened 4th segment is 1.5 

 times longer than the 5th; the narrowly amygdaloid 6th segment is only 

 slightly shorter than the 2nd segment, its maximum width 2/5 its length; 

 the spoon-shaped formation typical for Lanceola is absent at the dis- 

 tal end of the segment; the bulging anterior margin of the 6th segment 

 is medially armed with three pairs of strong, blunt, interlocking spines, 

 and distally with a row of shorter setae. The long, strong, slightly curved 

 claw may fit compactly in the palmate margin of the 6th segment, nearly 

 reaching its midlength. In pereopods VI the 2nd segment is equal to the 

 6th; the distally broadening 4th segment is almost equal to the 5th; the 

 6th segment is slightly shorter than the 4th and 5th together, slightly 

 narrows distally, and has a well-developed spoon-shaped depression in 

 which the small curved claw extends. Pereopods VII are slightly shorter 

 than VI, with roughly the same proportions, although the 6th segment is 

 relatively shorter. 



The uropods are broad, short, and structured as in L. clausi. The 

 narrow triangular telson is slightly longer than half the length of the 

 basipodite of uropods III. 



76 Notes: L. chelifera differs from L. clausi (and also from the 

 other species of Lanceola) in the unique structure of the distal 

 segments of pereopods UI-V. The broadened amygdaloid 5th segment 

 of pereopods III and FV and the broad 6th segment of pereopods V are 

 immediately recognizable. 



L. chelifera is closest to L. sphaerica; moreover, the unique struc- 

 tural features of pereopods III-V which distinguish L. sphaerica from 

 L. clausi, are better developed in L. chelifera. For L. sphaerica the large 

 5th segment of pereopods III and IV armed with strong marginal setae is 

 characteristic. In L. chelifera these segments are even more amygdaloidly 

 broadened and the marginal setae modified into spines so that the 5th and 

 6th segments touch and tend to form a subchela. The anterior margin of 

 the 6th segment of pereopods V is provided with true interlocking spines 

 and together with the long strong claw form a subchela; moreover, the 



77 spoon-shaped process in the distal part of the segment, modified into a 

 plate in L. sphaerica, is totally absent here (or becomes so brittle and 



