450 



ZOOLOGY. 



The carps (Cyprinus), shiners and minnows abound every- 

 where in the Northern States in ponds and weedy streams. The 

 breeding habits of the dace (Rhinichthys atronasus Mitchill) 

 have been observed by Dr. Gregg. The females spawn over 

 ''nests" or shallow depressions two feet in diameter in run- 

 ning brooks about a foot deep ; the male passes over the 

 eggs fertilizing them ; then the pair bring small pebbles 

 which are dropped over the eggs, until layer after layer alter- 



Fig. 405. Neochanna. From Liitken. 



nately of eggs and pebbles are deposited, when a heap is 

 formed, the young hatching out and remaining among the 

 pebbles until old enough to venture out into the stream. 

 The dace is closely allied to the chub (Semotilus rliotlieus 

 Cope, Fig. 407). Succeeding them are the suckers (family 

 GatostomidcB) of which Oatostomus teres Lesueur is an ex- 

 ample. 



The blind fish of the Mammoth and other caves, and of 



Fig. 406. Mud-Minnow. From Abbot. 



adjoining wells connecting with subterranean streams, are 

 remarkable for the rudimentary state of the eyes, and con- 

 sequently of color. There are but two species, the more 

 common and larger being Amblyopsis spelceus De Kay; this 

 species is viviparous. Representing the family Unibridte is 

 the mud-minnow (Melanura limi Kirt., Fig. 406). 



The flying-fish represent another family. Their pectoral 

 fins are very broad and large. They dart from the water 



