INTERDUNAL PONDS AND TAMARACK SWAMPS 171 



and 'one feeble double-looped ridges directed forward. It is 

 usually not over 3 inches long. Anadonta grandis (Fig. 183) is a 

 large clam 3-7 inches long. The shell is generally thin; the 

 muscle scars are not clear. The color is dark green to black. 

 There may be rays on the young shell. The umbones bear 

 double-looped ridges. 



The common pike (Fig. 184) is a slender fish up to 36 inches 

 in length. The head has no scales on its upper portion. The 



182 183 



FIGS. 181-183: Fig. 181. Shell of clam, Lampsilis luteola; Fig. 182. 

 Alasmodonta marginata; Fig. 183. Anadonta grandis. 



mouth is very large, one-half the length of the head. The red 

 horse is one of the suckers all good-sized fish recognize by the 

 snouty head and the ventral position of the mouth. The lips 

 in this species are strongly plicate. It is a very widely distrib- 

 uted form. The Cayuga minnow and the common shiner are 

 both minnows belonging to the genus Notropis. The minnows 

 are usually small, 3-4 inches long, have very large scales in 



