54 
Cope.] [March B 
The pertinence of this genus to the Oharacinida cannot be considered 
as entirely established, as the specimen described does not display any 
of the fins. The appearance is not unlike that of Osteoglosswm, but the 
structure of the scales distinguishes it. The great development of the swd- 
and postorbital bones, and small size of the preorbital, distinguish it as 
allied to the Characins. Its dentition and general form approach the 
genus Anacyrius Mill. but it is at the same time distinguished by the lack 
of maxillary teeth. In addition, it appears to lack the anterior inter- 
neural spines found in so many Characin and Clupeoid genera, and in 
families allied to them. They are at least not apparent on the faces of 
two fractures across the vertebral column. Three vertebrae are exposed 
throughout their length. They are longer than deep, and exhibit the 
two lateral grooves common to so many Teleosts. The only scales pre- 
served are those above the pectoral fins, with but few above the vertebral 
column. None of these present traces of the lateral line. The clavicle 
makes a right angle with its inferior limb, and with the coracoid, and is 
produced backwards at the base of the pectoral fin. The epéclavicle and 
post-temporal are wide bones. The operculum is developed upwards to 
the epiotic, and the interoperculum is present. A fragmént represents 
the suboperculwm, which was probaly a narrow bone. The coracold was 
a broad vertical lamina, extending horizontally forwards to below the pre- 
operculum, 
ANADOPOGON TENUIDENS, Cope. 
Orbit round, its diameter entering the length of the head five times, 
and a little exceeding that of the muzzle and. closed under jaw. The pro- 
file is gently descending and perhaps slightly concave ; the symphysis 
mandibuli is very stout and presents an angle outwards; the inferior 
margin of the dentary is slightly convex. The maxillary bone is slender. 
The suborbital bones together form a shield deeper than wide; with the 
postorbitals they reach the preoperculum. The head increases rapidly in 
depth. The scales are large, and extended below the operculum on the 
sides of the coracoid region. They have smooth margins, and are every- 
where quite thin. The surface is glistening, and in some scales exhibits 
under the microscope delicate parallel lines which separate short concave 
lines. The middle of the scale is marked with obtuse tubercular radii, or 
small or minute tubercles. 
Measurements. M. 
UeeM GEOL WOAG i ihy0 06 ci tanto aie wyatt eae eNOS dives ie 0.14 
LY OU MIOUUN aaliyah gn aw (erie os tees: 061 
ef GUNCONAGOIG WOUGh Fas ee on ae) 091 
Depth head at eye...... shes Th Gee Wa eG © dopa pied sou ede 098 
- ep VORUCS <A kA sie si nga ge 126 
So SUD OL DIU) SOCIO yal w fire cdsd wienbh vpeh sermehe sw paces poli ice, 044 
Six series of scales between basis of pectoral fin and vertebral column. 
A mandibular tooth is lancet shaped, and with minutely striate enamel. 
A premaxillary is more conic; both are rather small. 
