250 MEMOIRS OF THE CARNEGIE MUSEUM 



Allied to L. hrunneus, the head strigilate. 



Head 5; width of head 1.5 in its length; eye 6, interorbital 4.5, snout 2.2 in 

 the head; width at first anal ray 5.33-5.06 in its distance from the caudal; scutes 

 17 + 13 to 14 + 15. the lateral keels nearly merged behind. 



Upper lip with a marginal fringe of tentacles; lower lip papillose, except near 

 the margin, with a marginal series of tentacles, which do not extend to the gill- 

 opening. 



About six teeth in each side of the upper jaw and eight on each side of the 

 lower. 



Head and body strigilate; lateral keels weak, other scutes (except nuchal 

 scutes) not carinate; occipital with a pair of slightly diverging keels, the two 

 following nuchal plates each with a pair of keels. 



Orbital notch narrow and deep, eye nearly circular. Lower surface of the 

 head naked, except for a narrow entering triangle in front of the gill-opening. 



Anal plate margined by three large plates, the anal buckler composed of eleven 

 plates; posteriorly three, anteriorly five, series of plates between the lateral series. 

 Ventral armature fully developed (even in the smallest individuals) to between the 

 anterior angle of the gill-openings. 



Dorsal spine about equal to the head. Pectorals truncate, reaching ventrals. 

 Ventrals rounded, or the outer ray slightly produced, reaching the anal. Upper 

 caudal ray forming considerably more than a third of the total length. 



Dark, with the usual cross-bars; pores black, but not conspicuous. Dorsal 

 rays spotted, a large spot near the tip of the three first rays. Pectorals, ventrals, 

 and anal barred, the bars most evident on the first rays. Base and margin of caudal 

 black, the outer raj^s barred. 



Hemiodontichthys Bleeker. 

 Hemiodontichthys Bleeker, Nederl. Tijdschr. Dierk., I, 1863, 81. 



Type, Hemiodon acipenserinus Kner. 



Intermediate in shape between Loricaria and Fadowclla, the snout produced 

 and expanded at the tip, and having numerous small recurved spines. 



115. Hemiodontichthys acipenserinus (Kner). 

 Hemiodon acipenserinus Kner, Denkschr. Akad. Wiss. Wien, VI, 1853, 92, pi. 7, 



fig. 2 (Rio Guapore, Mattogrosso) . 

 Loricaria acipenserina Gtjnther, Catalogue, V, 1864, 260 (copied). — Vaillant, 



Bull. Soc. Philom., (7), IV, 1880, 159 (Calderon). 

 Hemiodontichthys acipenserinus Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., 



