600 



FISHES. 



chiae rudimentary. Pharyngeal teeth 4 or 5.-5, cuneiform, 

 slightly hooked at the end. 



Fig. 27i.— The Tench (Tinea tinea). 



Only one species of "Tench'' is known {T. tinea), found 

 all over Europe in stagnant waters with soft bottom. The 

 "Golden Tench" is only a variety of colour, an incipient 

 albinism like the Gold-fish and Id. Like most other Carps 

 of this group it passes the winter in a state of torpidity, 

 during which it ceases to feed. It is extremely prolific, 

 297,000 ova having been counted in one female ; its spawn 

 is of a greenish colour. 



Leucosomus. — Scales of moderate or small size ; lateral line 

 present. Dorsal fin commencing opposite, or nearly opposite, to 

 the ventral. Anal fin short. Mouth anterior or sub-anterior ; 

 intermaxillaries protractile. A very small barbel at the ex- 

 tremity of the maxillary. Lower jaw with rounded margin, 

 and with the labial folds well developed laterally. Gill-rakers 

 short ; pseudobranchise. Pharyngeal teeth in a double series. 



A North American genus, to which belong some of the 

 most common species of the United States. L. pulehellus 

 (the "Fall-fish," "Dace," of "Eoach"), one of the largest 

 "White-fishes of the Eastern States, attaining to a length of 

 18 inches, and abundant in the rapids of the larger rivers. 

 L. corporalis (the " Chub "), common everywhere from New 

 England to the Missouri region. 



Ghondrostoma. — Scales of moderate size or small. Lateral 



