319 
pectoral and extends on to the anal. Blackish-green, with six black 
vertical bands, crossing a deep black longitudinal band, which runs 
from above the pectoral to the root of the caudal. Vertical and ven- 
tral fins blackish, darkest at the base and margins. 
This species would be placed in the genus Heros of Heckel. 
Hab, Rio de la Lana (Mexico). 
in. lin 
MotallonpGbc oat 55. cwicwwoerars ateuniang (5 
Length of the head 4 os. 5 ieee veal. 0 11 
Height of the body, .... ...6...02.. vstorali Wbin'S 
Diameter of the eye...... P apiate ES Jee « 0°23 
TETRAGONOPTERUS ENEUS. 
D.11. A. 26. V.8. L. lat. 35. L. transv. 7/6. 
The height of the body is contained three times or three and a half 
times in the total length, and the length of the head four and four- 
fifths times. The interorbital space is convex, and its width more 
than the diameter of the eye, which equals nearly the extent of the 
snout. Uniform bronze-coloured, with a brownish spot at the root of 
the caudal. 
Hab. Fresh waters of Oaxaca (Mexico). 
in. lin. 
ESM REN UNL Asc odio lara 0, dillon cous eaiese ioe Eick aya 
Picimbt af the Hody:....is.5,3chenct ons sa eleewey . Loo 
edeth ofthe nead ic: cai. ened oon p.. Bt 
Dismeter of the'eye.. 2. 5... os. ons wie, Dig 
7. Descriptions or New SHELLS FROM THE COLLECTION OF 
Huexu Cumine, Ese. By Tempre Prime, or New York. 
1. BaTissA UNIONIFORMIS, Prime. B. festa ovato-orbiculari, 
subequilaterali, elongata, fortis, intus violacea, epidermide 
brunnea vestita, sulcis remotis, umbonibus depressis, erosis, an- 
tice inclinatis ; dentibus cardinalibus crassis; lateralibus an- 
gustis, regulariter serrulatis. 
Long. 43, lat. 3, diam. 1,5, poll. 
Hab. 2 
2. Barissa GRaciuis, Prime. B. testa ovato-subrhomboidea, 
depressa, levi, inequilaterali, epidermide virescente vestita, 
transversim irregulariter sulcata ; umbonibus tumidis, erosis ; 
valvis intus ad margines violaceis ; cardine angusto ; dentibus 
cardinalibus inequalibus ; lateralibus elongatis. 
Long. 3, lat. 24, diam. 24, poll. 
Hab. 2 
3. Barissa ruscata, Prime. B. testa ovato-trigona, oblonga, 
inequilaterali, in medio tumida, transversim regulariter striata, 
