FISH. 1 7 



2. Dules Leuciscus. Jen. 



Dales malo, Vol. ? Hist, des Poiss. torn. vii. p. 360. 



D. pinnis caudali, anali, dorsalique molli, nigro-marginatis ; dorsali profundi emar- 

 oinatd, spina idtimd radiis articidatis breviore ; operculo mucronibus duobus, inj'e- 

 riore maxima, armato ; preoperculo margine adscendenli levissime denticulato, basalt 

 denticulis fortioribus. 



B. 6; D. 10/11 ; A. 3/12; C. 16, &c. ; P. 13; V. 1/5. 



Long. unc. 4. lin. 5. 



Form. — General form resembling that of a small Dace. Greatest depth about one-third of the entire 

 length, caudal excluded. Length of the head rather less. Dorsal line falling with the profile 

 in one continuous gentle curve. Eyes large; their diameter contained two and a half times in 

 the length of the head : the distance between them less than one diameter. Suborbitals finely 

 but very conspicuously denticulated. Jaws nearly equal; the lower one a little the longest. In 

 each, a band of velutine teeth, with the outer row rather longer than the others. Opercle with 

 two points, the lower one most developed. Preopercle with the limb striated : the ascending- 

 margin with the denticulations so fine as to be hardly sensible to the naked eye ; those on the 

 basal margin larger and more obvious. Scales of a moderate size; about forty-three in a 

 longitudinal row ; their free portions finely striated. Cheeks and opercle scaly ; crown naked, 

 with a shallow groove above each eye. Lateral line at first slightly descending, but afterwards 

 straight ; its course, until past the dorsal and anal fins, a little above the middle of the depth. 

 Dorsal deeply notched : the anterior portion consisting of nine spines ; the first very short, and 

 scarcely more than half the length of the second; third and fourth longer, increasing gradually; 

 fifth and sixth equal and longest, equalling half the depth of the body ; seventh, eighth, and 

 ninth, shorter, and gradually decreasing ; the tenth spine, with which the second portion of 

 the fin commences, is of the same length as the fifth, but not quite so long as the soft rays 

 which follow; these soft rays, however, gradually become shorter, the last two not more than 

 equalling the second spinous. The whole space occupied by the dorsal is more than one-third 

 of the entire length. Anal commencing in a line with the ninth dorsal spine ; its own three 

 spines gradually increasing in length, but the second the strongest ; soft portion of this fin 

 longer than the corresponding portion of the dorsal, and terminating a little nearer the caudal. 

 Vent in a line with the seventh dorsal spine. Pectorals small, reaching to the vent. Ventrals 

 attached a little further back, and reaching a very little beyond it. Caudal forked. 



Colour. — (In spirits.) Silvery, tinged on the back, and above the lateral line, with bluish grey, 

 and somewhat mottled in places with darker spots. Fins yellowish-grey, tinged with dusky. 

 The caudal, anal, and soft portion of the dorsal, are a little mottled with dusky, besides having 

 a black edging ; there is also a conspicuous black spot at the anterior angle of this last fin. 



