326 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
(J in lioiid. The pectoral roaches half way to the dorsal. Tho color is i>rccisely as do- 
scrihed for coniiitu^, except that the middle stripe is decidedly paler than the <;round 
color of the hotly, but darker on the head, the change being abrupt at the opercular 
margin. The caudal lin is dark brown, with several vertical rows of white specks or 
blotches running across the rays. The anterior part of the dorsal is similar in color, 
but paler. Tdtal length a trille over an inch. A scale from tho region mentioned by 
I’utnam is similar to that of a^a-isizi, but with 5 or G concentric lines and 3 radiating 
furrows. 
The specimen thus agrees with coriintut in position of eye and plan of markings, 
with ar/ansizi in length of pectorals and structure of scales, is intermediate in length 
of head, and agrees with neither in color of caudal and dorsal and tint of middle 
baud. {Forbes, in lit. November 4, IBrtO.) 
Family XLIX.— CYPRINODONTID^E. 
{The Cijprinodonts.) 
Body obloii" or moderately elongate, compressed behind, depressed 
forwards, covered with rather large cycloid scales, which are adherent 
and regnlarly arranged. No lateral line. Head scaly, at least above, 
^lonth terminal, small, the lower jaw iisnally projecting; margin of the 
ii]>per jaw formed by the premaxillaries only; premaxillaries strong, 
extremely protractile. Teeth incisor-like or villiform, sometimes present 
on the vomer, but usually in the jaws only; lower pharyugeals sepa- 
rate, with cardiform teeth. Gill-membranes somewhat connected, free 
from isthmus ; gill-rakers very short, thick. Branchiostegals 4-6. 
Bsendobranchioi none. Dorsal tin single, inserted posteriorly, of soft 
rays only, rarely with a single spine or a rudimentary spinous dorsal ; 
caudal tin not forked ; ventral tins abdominal, rarely wanting ; pectoral 
tins inserted low; no adipo.se tin. Stomach not coecal, without pyloric 
appendages. A#-bladder simple, often wanting. Sexes usuall}' unlike, 
the tins being largest in the males. Most or all are ovoviviparous, 
the young well developed at tSme of birth. Fresh-water fishes of South- 
ern Europe, Asia, Africa, and America, some of them occurring in bays 
and arms of the sea. They are mostly of small size, and the species are 
very diflicult of determination. Genera 30; species about 140. 
{Cyprinodontidic Giintber, vi, 293-3 .jG.) ^ 
Nute. — In tho following iiiialysi.s tho genera known from Mexico aro also included, 
their name.s being placed in italics. 
* Intestinal canal comiiaratively short, little convoluted ; teeth mostly fixed ; dentary 
bones firmly joined. ( Carnivorce . ) 
a. Anal fin of tho male not modified into an iutromitteut organ. 
b. Teeth incisor-like, notched ; insertion of dorsal nearly opposite ventrals. {Cy- 
jyrinodontince.) 
c. Teeth in a single series; body short and deep. 
d. Dorsal very long, with 16-18 r.ay8, the first spiue-liko. .. Jordaxella, ir)6. 
dd. Dorsal short, of 10-11 rays, tho first ray small Cyprinodon, 157. 
