230 



BRANCH CHORDATA 



it is spotted with small white specks. When swimming, the limbs are folded 

 back. 



The other species {Pseudobran'chus dria'tus) is only about 7 inches in 

 length and has three digits to each fore foot. 



Fig. 188.— IMud pui 



111 and lUttg(r, Lnglc hard & Co., Pub- 

 lishers.) 



The family Prote'idm consists of amphibians having three pairs of per- 

 sistent gills, two pairs of weak limbs with four digits to each one, or the 



^ /^' 



Fig. I'm.—Pw'ltui. angutnus Kuiop( i,iuoni Do(U( >= ' Giueral Zool- 

 ogy," American Book Co, Publisheis ) 



anterior pair with two, and the posterior with three digits. The eyes are 

 without lids and covered by a transparent skin, but are functional. They 

 have teeth on the vomer, mandible, and premaxillaries. 



