FISH. 117 
Maldonado with the Pecilia decem-maculata. There are several specimens in the 
collection, none of them exceeding the size above mentioned, and they have all 
the appearance of being full grown. Some have the lines of spots much more 
interrupted than others. 
OF LEBIAS MULTIDENTATA. Jen. 
Puate XXII. Fig. 3. 
L. corpore subelongato, subcompresso, viridescenti-fusco; lateribus fasciis angustis 
o ? ? fo} 
paucis longitudinalibus albidis obscurioribus : dentibus seriebus plurimis disposites, 
omnibus tricuspidatis : caudali rotundatd. 
D.9; A. 9; C. 26, brevibus inclusis; P. 13; V. 6. 
Lone. une. 3. lin. 2. 
Form.—The general form and proportions of this species are extremely similar to those of the last; 
but it differs very remarkably in having behind the anterior row of tricuspid teeth, a band of 
minuter teeth above and below, all of which are also tricuspid, and similarly formed to those 
in front. Head one-fifth of the entire length; flattened on the crown. Jaws nearly equal; 
upper one very protractile. Scales large; about thirty-two in a longitudinal line, and eight 
in the depth; covering all the pieces of the opercle; similar in form to those of the last 
species, but with the striae on the free portion finer and more numerous, the deep-cut basal 
strize also rather more numerous, amounting to about fourteen, and of unequal lengths, gra- 
dually increasing from the outermost to the middle ones. Lateral line similar; also the same 
pores on the lower jaw. Fins and finray-formula similar: in both species the first and last rays 
of the dorsal and anal are simple, and shorter than the others. The anal perhaps terminates 
a little nearer the caudal than the dorsal does. 
Cotour.—( In spirits.) Greenish-brown, with very little appearance of markings in its present 
state. There is, however, some indication of an irregular scattered row of smali black spots 
on each side, a little below the ridge of the back ; also of two or three pale longitudinal narrow 
bands along the middle of the sides, which were probably more conspicuous in the living fish. 
The belly is yellow, and very tumid; but these are evidently characters merely indicative 
of the female sex. 
Habitat, Monte Video. 
This is another new species of Lebias taken by Mr. Darwin in fresh-water 
at Monte Video, if indeed it strictly belong to the genus; but the circumstance 
of the teeth being in several rows, and in fact forming a complete band, is at 
variance with the generic characters as given by Cuvier. The teeth however 
being exactly of the same form as in the other species, and the general charac- 
ters on the whole similar, I have not thought it expedient to erect it into a new 
genus. There is but one specimen in the collection, which appears to be a large 
female big with young. 
