GALEICHTHTS.— AEIUS. 125 



Here described from eight specimens, 220 to 330 mm. in total length, including 

 the type of the species and co-types of G. gilherti and G. eigenmanni. 



12. G-aleichthys longicephalus. 



GaJeichthys dasycephalus (non Giinth.), Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1900, p. 2780'; 



Gilb. & Starks, Mem. Calif. Ac. Sci. iv. 1904, p. 25 \ 

 GakicMhys longicephalus (Eigenm. & Eigenm.), Jord. & Everm. t. c. p. 2781 ' ; Gilb. & Starks, 



\.c.\ 



Depth of body 5| in the length, length of head 4. Breadth of head 1| in its length, diameter of eye 6i. 

 Fontanel produced into a groove which reaches the parieto-oocipital ; occipital process strongly keeled, 

 as long as broad, with truncated apex and slightly concave sides. Width of mouth ^ the width of head ; 

 prsemaxillary band of teeth 4 times as long as broad ; vomerine patches of teeth small, well separated, 

 continuous with the rather small oblong or oval palatine patches. Maxillary barbel extending to the 

 basal part of the pectoral. 6 gill-rakers on the lower part of the anterior arch. Dorsal I 7 ; spine k 

 the length of head ; adipose fin a little longer than the dorsal. Anal 19. Pectoral spine | the length 

 of head, with the inner edge weakly serrated. 



Ilah. Panama {Jordan ^ - ^ iy 



Here described from a specimen of 250 mm. 



13. Galeiclithys peruvianus. 



Galeichthys peruvianus, Liitk. Vid. Medd. 1874, p. 205 ^ ; Steind. Sitzungsb. Ak. "VVien, Ixxii. 

 1876, p. 584" ; Eigenm. & Eigenm. Occ. Papers Calif. Ac. Sci. i. 1890, p. 51 '; Jord. & 

 Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 122 '." 



Apparently allied to the preceding species, which it resembles in the arrangement of the teeth on the palate, 

 but well distinguished by the loiiger occipital process, the narrower prasmaxillary band of teeth (8 times 

 as long as broad), and the shorter anal fin, with 14 to 16 rays. 



llcib. Pacific Coast from Mexico to Peru : 



Altata in Sinaloa ^ ; Panama - ; Callao ^ " '■''. 



3. ARIUS, Cuv. & Val., 1840. 

 Arius (part.), Cuv. & Val. Hist. Nat. Poiss. xv. p. 52 (1840) ; Giiiith. Cat. Fish. v. p. 174 (1864). 

 Tachysurus*, Eigenm. & Eigenm. Occ. Papers Calif. Ac. Sci. i. 1890, p. 42; Jord. & Everm. Bull. 



U.S. Nat. Mus. xlvii. 1900, p. 2782. 

 Gaihorops (Jord. & Gilb.), Jord. & Everm.. t. c. 1896, p. 133, 



Like Galeichthys, from which it differs only in having the teeth on the palate 

 granular or obtusely conical instead of villiform, this genus comprises a considerable 

 number of species from the coasts of tropical and subtropical countries, most of which 

 enter fresh water. 



* Lacepede (Hist. jN'at. Poiss. v. p. 151, 1803) founded the genus Tachysurus on a Chinese painting of a 

 fresh-water fish which may have belonged to Galeiclithys or Arms or may not have been at all closely related 

 to them. The generic diagnosis consists of (1) characters which are common to Arius, PiMehdus, and otlier 

 genera, and of (2) others which might certainly be held to define the genus TacJiysurus if they could be relied 



