NO. 



i063. WORTH AMERICAN PARASITIC C0PEP0D8— WILSON. 605 



6. Bulla globular and sessile; arms much shorter than trunk; maxillipeds plainly 

 \-isible, very large, destitute of claws; trunk contracted anteriorly into a 

 neck maracnae (Olsson), 1877. 



6. Bulla spherical and sessile; arms longer than trunk; maxillipeds plainly visible, 



slender, bearing claws; trunk spool-shaped and much elongated. 



extensa (Kessler), 1868. 



7. Dorsal outline of head elongate with concave sides; maxillipeds with accessory 



spines on basal or terminal joints, or both 8. 



7. Dorsal outline of head broadly ovate with convex sides; maxillipeds without 



accessory spines and often without claws 10. 



8. Bulla mushroom-shaped with enlarging pedicel; maxillipeds plainly \isible, but 



only reaching the base of the mouth tube; first maxillae with palp. 



edwardsii (Olsson), 1869, p. 609. 

 8. Bulla conical with enlarging pedicel; maxillipeds visible and reaching anterior 

 margin of head; first maxillae without a palp and with 2 setae. 



oquassa, new species, p. 611. 



8. First maxillae without a palp but with 3 terminal setae; maxillipeds of varying 



lengths 9. 



9. Bulla mushroom-shaped with two distinct pedicels; maxillipeds wholly visible. 



with a large spine on the basal joint; egg tubes widely separated at their base, 



bicauliculoia (Wilson), 1908, p. 6*12. 

 9. Bulla mushroom-shaped, only one pedicel; maxillipeds partly hidden; no spine 

 on basal joint; egg tubes close together at their base. 



falculata (Wilson), 1908, p. 613. 

 9. Bulla club-shaped, five times as long as wide; maxillipeds completely hidden 

 between the arms; the latter short and much swollen. 



%maZZi (Kessler), 1868, p. fa3. 



10. No terminal claws on maxilUpeds; egg tubes turned forward and curled against 



the trunk; diameter of bulla much greater than that of the arms 11. 



10. Small terminal claws present on maxillipeds; egg tubes long and slender and in 



normal position ; diameter of bulla about the same as that of the arms 12. 



11. First antennae two-jointed; exopod of second pair a segmented papilla; first maxillae 



short and stout; toothed edge of mandible continuous and uninterrupted. 



inermis (Wilson), 1911, p. 614. 



11. First antennae unsegmented ; exopod of second pair a claw; first maxillae long and 



slender; toothed edge of mandible with a wide gap near the center. 



extumescens (Gadd), 1901. 



12. Cephalothorax in line with trunk; basal joint of maxilliped very slender; exopod 



of second antenna distinctly jointed; no accessory spine on maxillipeds. 



arcturi (Miers), 1877. 

 12. Cephalothorax at an obtuse angle with trunk; basal joint of maxilUpeds stout and 

 armed with accessory spine; exopod of second antenna not jointed. 



beani (Wilson), 1908, p. 615. 

 12. Cephalothorax at right angles to trunk; bases of arms forming a pronounced hump 

 across back of head; terminal claw of maxillipeds large. 



gibber (Wilson), 1908, p. 615. 

 12. Cephalothorax at right angles to trunk; no pronounced hump; no claw on maxil- 

 lipeds carpenteri (Packard), 1874, p. 616. 



SALMINCOLA CALIFORNIENSIS (Dana). 

 Lernaeopoda californiensis Dana, 1852, p. 1379, pi. 96, figs, la and 16. 



Plate 29, figs. 16 and 17. 

 Host and record of specimens. — Several females were taken from 

 the body of a salmon (Oncorhynchus) in the Klamath River, CaU- 



