616 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



3. Females, genital segment obovate, longer than wide; lobes long, conical; 



fourth legs long longipes, new species, p. 618. 



3. Females, genital segment orbicular, a fourth wider than long; lobes short; 



fourth legs short chilensis, new species, p. 658. 



4. Males, genital segment obovate, three-fifths the carapace; fifth and sixth 



legs separated nordmannii (M-Edwards, 1840), p. 623. 



4. Males, genital segment oblong, one-fourth the carapace; fifth and sixth 



legs close together erecsoni (Thomson, 1890) 



5. Males, both fifth and sixth legs showing plainly 6. 



5. Males, only fifth legs showing, but with a pair of dorsal papillae at the base of 



the genital segment 7. 



5. Males, only fifth legs showing ; no papillte 8. 



5. Females, genital segment without appendages of any sort 9. 



6. Genital segment barrel-shaped, sides curved; no lobes; fourth legs reach- 

 ing its center pectoralis (Muller, 1776) . 



6. Genital segment oblong, sides parallel; well lobed; fourth legs reaching 



abdomen tip chilensis, new species, p. 658. 



7. Genital segment obcordate, one-third the carapace; fourth legs reaching its 



center only appendiculatus ( Kroyer, 1863 ) . 



7. Genital segment quadrate, one-fifth the carapace; fourth legs reaching fully to 



its tip robustus (Kroyer, 1863), p. 646. 



7. Genital segment reniform, wider than long; anterior appendages lateral rather 



than dorsal crabro (Kroyer, 1863 ) . 



8. Genital segment semilunar, wider than long; fourth legs nearly reaching its 



tip : rotundiventris (B-Smith, 1898, b). 



8. Genital segment diamond-shaped, longer than wide; lobes short, acute; fourth 



legs short bagri (Dana, 1852) . 



9. Genital segment ovate, wider than long; lobes acute, spine-like; fourth legs reach- 

 ing its tip suhmi ( Brady, 1883 ) . 



9. Genital segment elliptical, longer than wide; lobes broad, rounded; fourth legs 



reaching its center nordmannii (M-Edwards, 1840 , p. 623. 



9. Genital segment subquadrate, wider than long; lobes broad, rounded; fourth 



legs reaching abdomen tip erecsoni (Thomson, 1890 ) . 



10. Males, both fifth and sixth legs showing plainly 11. 



10. Females, only the fifth legs showing dorsally .12. 



10. Females, no appendages visible dorsally 13. 



11. Genital segment elliptical; fourth legs reaching abdomen tip; branches of furca 



bifid hippoglossi (Kroyer, 1837 ) , p. 625. 



11. Genital segment ovate; fourth legs not reaching its tip; furca branches flattened, 



f oliaceous edwardsi, new species, p. 627. 



11. Genital segment elliptical; fourth legs medium; furca branches acuminate, close 



together dissimulatus, new species, p. 631. 



11. Genital segment quadrate; fourth legs medium; furca branches blunt, flanged, 



widely separated parvivenlris, new species, p. 635. 



12. Genital segment orbicular; abdomen minute, spindle-shaped, much widened 



at center rotundiventris (B-Smith, 1898, b) . 



12. Genital segment broad flask-shaped ; fifth legs longer than abdomen. 



cossyphi (Kroyer, 1863), p. 644. 

 12. Genital segment orbicular, wider than long; abdomen nearly covered by it 



posteriorly dissimulatus, new species, p. 631. 



13. Genital segment elliptical, longer than wide; lobes short, narrow; furca 



branches bifid, truncate hippoglossi (Kroyer, 1837), p. 625. 



13. Genital segment orbicular, wider than long; no lobes; fourth legs two-jointed 

 with three spines brachyurus (Heller, 1865). 



