102 SILURID.E. 



pectoral spine very conspicuously so ; caudal fin moderately forked. 

 (Girard.) 



Source of the Rio Pecos. 



Pimelodus hammondii, Abbott. Proc. Acad. Nat. Sc. Philad. 1860, 

 p. 568, appears to have a comparatively smaller head than P. lupus, 

 constituting somewhat less than one-fifth of the total length, whilst 

 it is said to be" one-fourth in P. lupus. — Kansas. 



Ictalurus simpsonii, Gill, Proc. Bost. Soc. Nat. Hist. 1862, p. 43, 

 appears to me to be identical with P. hammondii. 



10. Amiurus cauda-furcatus. 



Pimelodus cauda-furcatus, Lesueur, Mem. Mm. cVRist. Nat. 1819, v. 



p. 152 (not P.furcatus, Cuv. & Yal.). 

 furcifer, Cuv. § Veil. xv. p. 139 ; Hyrtl, Denkschr. Acad. Wiss. Wien, 



1859, xvi. p. 16 ; Kncr, Sitzt/sber. Aeacl. Wiss. Wien, xxvi. p. 421. 

 olivaceus, Girard, in U. 8. Pacif. R. R. Exped. Fish. p. 211. pi. 41. 



figs. IS, and pi. 42 (incorrect). 

 graciosus, Girard, in Proc. Acad. Ned. Sc. Philad. 1859, p. 161. 



B. 8. D. 1/6. A. 26-27. P. 1/9. Vert. 13/29 (C. Sf V.), 



15/30 {Hyrtl). 



Head one-fourth longer than broad ; the maxillary barbels extend 

 beyond the end of the head. Dorsal spine as long as the head with- 

 out snout; pectoral spine stronger and rather longer than that of 

 the dorsal fin, denticulated interiorly. Adipose fin short ; caudal 

 deeply forked. 



Ohio, Missouri, and Arkansas Pavers. Surinam (?). 



a. Half-grown : skin. Ohio Canal. From Dr. ParnelTs Collection. 



b. Half-grown : skin. Portsmouth, Ohio River. From Dr. Parnell's 



Collection. 

 c-d. Adult and young : bad state. 



11. Amiurus meridionalis. 

 D. 1/6. A. 28-29. P. 1/9. 



Head one-half or one-third longer than broad ; the maxillary bar- 

 bels extend to the end of the head. The length of the dorsal spine 

 is somewhat less than that of the head without snout, and nearly 

 equal to that of the pectoral spine. Adipose fin short. 



The height of the body is one-fifth of the total length (without 

 caudal), the length of the head one-fourth or two-ninths. Snout 

 obtusely rounded, with the upper jaw longer than the lower. The 

 diameter of the eye is one-half or two-fifths of the extent of the 

 snout, and one-third or two-sevenths of the length of the postorbital 

 portion of the head. The band of maxillary teeth is five or six times 

 as broad as long. The outer mandibulary barbels extend to the 

 posterior margin of the gill-membrane. The distance of the dorsal 

 spine from the snout is a little more than one-half of its distance 

 from the caudal fin ; it is finely serrated behind. The length of the 

 base of the adipose fin equals that of the dorsal. Caudal fin deeply 



