1899.] NATURAL SCIENX'ES OF PHILADELPHIA. 331 



"Fdrbung. — Die gauze Oberseite ist dunkel rothlichbrauu, auf 

 der Mitte des Riickens dunkler als an den Sclieibeurandern. Untei- 

 korper matt weisslich. 



"Lange, 5" — 6'". GWlsste Breite, 2" — 10.5'". 



"Vorkommen. — Das hier beschriebene Exemplar wurde in der 

 Heradura eiuer Caleta zwischeu Huacho und Chancay, gefangeu." 



MYLIOBATID^. 



10. Myliobatis californicus Gill. 



Uolorhinus vespertilio Gill, Troc. Acad. Nat. Sci. Phila., 1862, 331 ; 

 Myliohatis calif ornk us Jordan and Gilbert, Synopsis', 51, 1883. 



Local name, Raya. 



One specimen, from whicli unfortunately the tail has been cut. 

 Breadth of disc, 470 mm. ; line from eye to origin of ventrals, 

 200 mm. ; breadth of head, 80 mm. ; distance between nasal open- 

 ings, 31 mm. ; width of first middle tooth, 16 mm. ; length, 4 mm. 



Range. — Cape Mendocino, San Diego, Callao. 



SILURID^. 



11. Galeichthys peruanus Liitken. 



G(il(i('hthi/s peruanris Liitken, Ichthyographische Bidraor, ii (Vi- 

 densk. Meded., 1874, 20.i) [Callao] ; Steindachner, Ichthyol. Bei- 

 triige, iv, 34 (S. B. Ak. Wien, Ixxii, 1875) [Callao, Altata, 

 Panama]. 



Tachysiirus peruanus Eigenmann and Eigenmann, Proc. Calif. Acad. 

 Sci., 2d Series, i, 140, 1888 [CallaoJ ; iUd., Eevision of South 

 American Nematognathi, Occasional Papers, i, Cal. Acad. Sci., 

 51, 1890 [Callao]. 



Local name, Bagre (common for most Sihiroids). 



Three specimens. Head .25 of total length, depth .16. Dis- 

 tance from snout to oi'igin of dorsal .31; gill rakers 5 -f 9, 6 -f- 10, 

 6 -f- 8; D. I, 6 to 7, A. 14 to 15. 



One 9 specimen (No. 11,962, L. S., Jr., U. ) appears to difler 

 from the others, but not sufficiently to warrant separating it from 

 the species. The head is somewhat shorter, .22 in total length; 

 the ventrals are longer, . 16 in total length. The dorsal is inserted 

 somewhat more anteriorly (.29 to end of snout) and the outline of 

 the humeral process is orbicular instead of being irregular, as in 

 the other specimens. 



The number of gill rakers in all three differs somewhat from the 

 count given by Eigenmann. 



Length 290-320 mm. 



Range. —Callao to Tropic of Cancer. 



