1871.] 53 [Cope. . 
block of lime slate from Chiapas, Mexico. The body is seen in profile, 
but the head has been pressed from above, and the view is therefore 
oblique. 
The general form is elongate. The pectoral fins are inserted at the 
pectoral plane, and are of moderate length. The ventrals are short and 
small, It is uncertain whether they reach the anal, as the anterior part 
of that fin is destroyed. From the small number of interhwmal spines, 
the anal has probably had a short basis. Caudal lobes narrow. A strong 
horizontal interneural spine. The anterior interneurals are like those of 
Megatops, slender, gently curved reds, apparently, but not really contin- 
uous with the neural spines in some places. T'he dorsal fin laid back- 
wards extends to the emargination of the caudal. The vertebra near the 
head are not altered. There appears to have been a laminiform crest on 
the head, but the bones thus described may be those of the opposite side 
of the cranium. The muzzle appears to be contracted and projecting 
beyond the mouth. Three narrow obtuse teeth appear on the edge of 
the premaxillary bone. Dentary bone, stout. Orbit, round, large ; 
entering 4.66 times the head to the posterior margin of the operculum, 
and 1.33 times the length of the muzzle. Operculum rounded. 
Radii; D. 2. 13. 1, C. 2. ?. 6, 6, A.? V.? I. 7%. P., apparently not 
numerous, but very numerously divided. There are about twenty-five 
longitudinal series of scales at a point a short distance anterior to the 
ventral fins. 
% M. 
SEO Gel TET FUL eayssoi ss ocacivacavorenesleigcavetdeddagnuedacainive hae mane aaieia 0.530 
Bength to: Orbit... c.sc.n00 nea ns cenacnatad 64a da etna ee eatin 024 
Vertical diameter of orbit....... 0.0... cece eee eee eee : .018 
* Ks déntary bones 20 s.coeeceeedass kx s vacexe, .016 
Length to opercular border........ eee eee ence cece eee ees 086 
ee VOM tA 2 sccsoncninwarsiadeeaswamooveagca aeetsnanadams 310 
ee Gorsal, 6 gasacisunamat evan eaain nner wadcomaad omnes 868 
et BASIS CAW Al ieisnsisraus-setpsorhoetneanis as ere latent atere als 880 
Depth at pectoral fins. ...... 2.2.0 cee eee e cece eee e eee ees 085 
fs Wenbral, “ieneiessys caactwer ener seeGemenees 074 
ns posterior margin dorsal ..........- sees ee eee eee 04 
ee basis CAUd als asks crea y ead dereea amare es ve manaane secon 02 
This species was found near Tuxtla Chiapas, Mexico, by Dr. J. Berendt, 
and by him sent to the Smithsonian Institution. Mus. No. 9819-20. 
Fam. (?) CHARACINID &. 
AN#DOPOGON, Cope. 
Mouth opening almost vertically upwards. Dentition weak, consisting 
of lancet shaped teeth on the dentary and premaxillary bones ; maxillary 
without or with minute teeth. Post-temporal bone large. Scales with few 
radii, no concentric grooves or cells. 
