298 MR. C. TATE REGAN ON THE 



(in a specimen of 230 mm.). Scutes 20+16 in a longitudinal 



series 4. O. guentheri Rgn. 



Length of snout 1| times in that of the head, diameter of eye 9i times 

 (in a specimen of 250 mm.). Scutes 18 + 15 in a longitudinal 

 series 5. 0. robusta Rgn. 



Length of snout 1J times in that of the head, diameter of eye 11 times 

 (in a specimen of 250 mm.). Scutes 20-21 + 16 in a longitudinal 

 series 6. 0. hjra Rgn. 



Length of snout about 1^- times in that of the head, diameter of eye 

 about 8 times (in a specimen of 240 mm.). Scutes ? +10-13 in 

 a longitudinal series 7.0. rostrata Spix. 



Scutes 14-16 + 16-18 in a longitudinal series 10. O. frenata Blgr. 



B. Pectoral spine extending nearly to middle of ventral, or beyond. 

 Breadth of body at level of last anal ray about 4 times in the distance 



from the latter to the caudal 8. 0. barbata Kner. 



Breadth of body at level of last anal ray about 7 times in the distance 



from the latter to the caudal 9. 0. pana?nensis Eigmn. 



1 . OXYLORICARIA L0RICARIIF0RMIS. 



Harttia loricariiformis Steind. Sitzb. Ak. Wien, lxxiv. pt. 1, 1876, p. 668 ; Eigenm. & Eigenm. 

 Proc. Cal. Ac. (2) ii. 1889, p. 39, and Occ. Pap. Cal. Ac. i. 1890, p. 386. 



Length of head of times in the total length. Head about as broad as long and 

 2-f times as long as deep. Diameter of eye 7 times in the length of head, interorbital 

 width of- times, length of snout If times. Snout rounded ; supraorbital edges not 

 raised. 29 scutes in a longitudinal series, 244-5, none of the scutes distinctly 

 carinate. Lower surface of head naked except for a granular plate in front of 

 each gill-cleft ; abdomen naked except for the lateral series of plates and a pair 

 of rather large anal plates. First dorsal ray nearly as long as the head ; pectoral 

 spine extending a little beyond base of ventral ; caudal slightly emarginate. Fins 

 with dark spots. 



Total length 155 mm. 



One specimen : South-eastern Brazil. 



2. OiYLORICARIA PLATYSTOMA. 



Loricaria platystoma Giinth. Proc. Zool. Soc. 1868, p. 236, figs. 4 & 5. 



Length of head 5 times in the total length. Head about 1\ times as long as broad 

 and 2^- times as long as deep. Diameter of eye 6 times in the length of head, 

 interorbital width 4 times, length of snout lf-lf times. Snout pointed; supraorbital 

 edges slightly raised. 29-30 scutes in a longitudinal series, 20-21 +-8-9, the lateral 



