NO. 3653 COPEPODS—CRESSEY 11 
tween the teeth on either or both the upper and lower jaw. It has been 
recorded also from other species of lamnid sharks. 
Nemesis lamna Risso 
Ficures 43-58 
Nemesis lamna Risso, 1826, p. 1386.—Roux, 1828, p. 174.—Gueérin, 1837, pl. 
35.—Krgyer, 1837, p. 199.—Milne-Edwards, 1840, p. 486.—Wilson, 1922, 
p. 59; 1932, p. 461.—Fage, 1923, p. 282.—Heegaard, 1962, p. 184.— 
Cressey, 1967b, p. 6. 
Nemesis carchariarum Roux, 1828, p. 176.—Kr¢yer, 1837, p. 199.—Milne-Edwards, 
1840, p. 486 [misspelled “‘carcherium’’]. 
Nemesis mediterranea Heller, 1868, p. 220.—Valle, 1880, p. 66.—Richiardi, 1880, 
p. 151.—Stossich, 1880, p. 262.—Carus, 1885, p. 365.—Brian, 1898, p. 15; 
1899, p. 201; 1902, p. 44; 1905, p. 7.—Bassett-Smith, 1899, p. 476. 
Nemesis lamna var. sinuata.—Valle, 1878, p. 91. 
Marteriau.—Four collections from the Indian Ocean, previously 
reported (Cressey 1967b); three collections from off Scripps Pier, La 
Jolla, Calif.; nine collections from off the Coast of Chile and Peru, 
R. V. Anton Bruun, Stations 552, 553, 554, 558, 564, and 572. 
FEMALE.—Body form as in figure 43. Total length 6.61 mm (5.85- 
7.95), greatest width 2.0 mm (1.73-2.40). Widths of cephalon and 
four free thoracic segments are as follows: cephalon 1.25 mm (1.19- 
1.50), first free thoracic segment 1.92 mm (1.80—2.33), second free 
thoracic segment 2.00 mm (1.73-2.40), third free thoracic segment 
1.99 mm (1.73-2.40), fourth free thoracic segment 1.74 mm (1.50- 
2.25). All measurements are based on an average of 10 ovigerous 
females randomly selected from the collection at Station 552. 
Fourth free thoracic segment (bearing leg 5) with many sclerotized 
papillae on dorsal surface. Genital segment (fig. 44) about as long as 
wide (.8 x .8 mm) and subdivided ventrally giving the appearance of 
two segments. Abdomen (see fig. 44) 2-segmented. Each segment 
with a few papillae on dorsal surface and armed with short hairs and 
spinules as in figure. Caudal rami short, about twice as long as wide 
(363u x 218), bearing rows of short spinules on ventral surface. 
First antenna (fig. 45) composed of 13 segments. Hach segment 
armed with short setae as in figure. Second antenna (fig. 46) 4- 
segmented, basal segment with weak triangular process on inner sur- 
face, antepenultimate segment with short seta on inner distal corner, 
penultimate segment unarmed, terminal segment in form of short 
claw bearing two setae on inner border. Mouth tube and mandible 
of usual caligoid type, mandible with eight to nine teeth. First maxilla 
(fig. 47) biramose; each rami with two setae, anteriormost ramus 
with one short and one long seta. Posterior ramus with two equal 
long setae. Tip of second maxilla (fig. 48) with short claw, claw 
covered with short papillae. Patch of spines present near base of claw 
