BULLETIN 95, UNITED STATES NATIONAL MUSEUM. 



4. MUSTELUS MENTO Cope. 



Mustelus mento Cope, Proc. Amer. Philos. Soc. Phila., 1877, p. 47 (31) ; 



Pacasmayo Bay. 

 Mustelus edulis Perez, C. Estudio Sobre Algunos Escualos Chile, 1886, p. 



4. — Philippi, Aun. Univ. Chile, vol. 71, 1887, p. 547. 

 Galeus mento Abbott, Marine Fishes of Peru in Proc. Acad. Nat. Sci. Phila., 



1899, p. 326. 

 Galeorhinus mento Delfin, Cat. Peces de Chile, 1901, p. 17. — Portee, Breve 



Nota de Ictiologia, Revista Universitaria, Lima, vol. 3, 1909, p. 138. 



From the Pacific Ocean at Pacasmayo, Peru. 



5. MUSTELUS ABBOTTI, new species. 

 TOLLO. 



Plate 1, fig. 2. 



Oaleus dorsalis, Abbott, Marine Fishes of Peru, Proc. Acad. Nat. Sci. Phila., 

 1899, p. 327; Callao; not Mustelus dorsalis Gill. 



Type.— Cat. No. 77696, U.S.N.M., a female, 55 cm. in length (field 

 No. 09115) and a paratype, also a female, No. 09107, -16.5 cm. in 

 length, taken with gill net, fishing in the surf at La Ventanilla be- 

 tween Ancon and Callao. 



One specimen (paratype), a young female, field No. 09532, 32 cm. 

 in length, from Lobos de Tierra. 



Following are the dimensions of the type and paratypes: 



Total length 



Distance from tip of snout to first gill slit 



Distance from tip of snout to eye 



Diameter of eye 



Length of spiracle 



Breadth of head 



Depth of head 



Interorbital (bone) 



Distance from tip of snout to front of mouth 



Distance between nostrils 



Distance between angles of mouth 



Distance from tip of snout to base of dorsal fin (not includ- 

 ing the fleshy ridge) 



Base of first dorsal 



Length of anterior margin of first dorsal (not including 

 broad fleshy base) 



Distance from origin first dorsal to origin second dorsal... 



Base of second dorsal 



Length of anterior margin of second dorsal 



Distance from origin second dorsal to base of caudal .... 



Length of upper caudal lobe 



Distance from base of notch on lower lobe to its insertion. 



Distance from tip of snout to insertion of pectorals 



Length of anterior margin of pectorals 



Breadth of distal margin 



Distance from base pectorals to ventral base 



Distance from base ventrals to anal base 



Base of anal 



Distance from insertion of anal to base caudal 



Depth of body 



Type. Paratype. Paratjrpe. 



Mm, 

 550 

 103 



47.5 



15 

 5 



57 



35 



30 



37 



16 



33 



170 



67 



.59 



177 



60 



48 



114 



105 



73 



119 



83 



69 



125 



105 



30 



78 



70 



mm. 

 465 

 87 

 42 

 13 

 5 

 49 

 28 

 24 

 30 

 13 

 28 



140 



55 



51 



136 

 47 

 42 



100 

 85 

 60 



107 

 67 

 52 



110 

 94 

 28 

 60 

 56 



mm. 



320 



57 



27.5 

 10.5 



3.5 

 33 

 19 

 15 

 21 



9.5 

 20 



93 

 35 



31 



96 



29 



27 



62 



58 



42 



62 



44 



34 



68 



66 



18.5 



39 



37 



