Cope. | 680 [May 17, 
The coracoid shields are lateral, and do not cover the abdomino-thoracic 
region. 
This genus is similar to Gastrodermus m. excepting in the increased 
number of dorsal radii, in which it is identical with Brochis. It might be 
called Brochis without coracoid breast shield. A synopsis of the species of 
this group is given below. 
Char. Specif.. Radiiz D, 1. 117A, TL. 65, Vio6;,P 1. Fo Dhecdorsal 
and pectoral spines are of sub-equal length and serrate behind only ; their 
length equals the distance from the pupil of the eye to the end of the muz- 
zle. The profile is rather steep ; the head is compressed, and the muzzle 
is produced. The diameter of the eye is a little more than one-fourth the 
length of the head, is one-half the length of the muzzle, and half the inter- 
orbital space measured over the convexity. There are two azygous bones 
between the supra-occipital crest and the first dorsal spine. There are 
twenty three vertical scuta between the supra-temporal, and the base of the 
caudal fin ; no dorsal or ventral azygous scuta. The postcoracoid plates are 
nearly smooth and sub-vertical, projecting downwards so as to form an ob- 
tuse keel on each side of the belly. Inferior bridge of scapular arch cov- 
ered with soft skin. Maxillary beard nearly attaining gill fissure ; inferior 
lip broadly reverted, produced into a short barbel on each side. Facial 
ossification extending one-third the distance to the maxillary ; half way to 
the end of the muzzle, and not enclosing nares. Color olivaceous ; top of 
head darker; fins immaculate. Length M. .059; of head .014; do. to base 
of ventral fin (axial) .022; to base of anal .035. Length of dorsal spine O11. 
Coll. 1877. 
A second species of this genus is the (. semiscutatus (Corydoras Cope, 
1872). The species and genera of this group are the following : 
Brocuts Cope, Proc. Ac. Nat. Sci. Phila. 1871. Coracoid shields cover- 
ing the breast ; dorsal soft rays 9-11. The Callichthys tatiosh Cast. prob- 
ably belongs to this genus. 
B. ceruleus Cope, loc. cit. 1872, p. 277. 
B. dipterus Cope, loc. cit. 1872, p. 278. 
CHA&NOTHORAX Cope, supra. Coracoid shield not enclosing the breast 
and belly ; dorsal soft rays 9-11. 
C. bicarinatus Cope, supra. 
C. semiscutatus Cope, Proceed. Acad. Phila. 1872, p. 280. 
This species differs from the (@. bicarinatus in the horizontally extended 
coracoid shields, the greater development of the facial ossification, the 
shorter muzzle, larger eye, and greater relative thickness of the head. 
Coryporas Lacep. Bleeker; Hoplisoma Sws. Coracoid shields enclos- 
ing ventral region ; dorsal soft rays 6-7. 
C. punctatus Lac. Giinther, Catal. v. 229. 
C. eneus Gill. Giinther, 1. ec. 
C. eques Steind. Sitzungsberichte Wien Akademie, 1876 (Juls), p. 92, Pl. 
XII, fig. 3. 
