102 BULLETIN 34, U.YITED STATES NATIONAL MUSEUM, 



The limbs are weak. The digits are however very long, cylindrical, 

 depressed, without membrane. The proportions of the digits are as in 

 A. punctatum. The longest finger is but one-third the fore-arm; the long- 

 est toe is a little more than one-third the leg from knee. The out- 

 stretched hind legs are about two thirds the head and body to groin. 

 When the fore and hind legs are extended and appressed to the sides 

 they are separated by six of the intercostal spaces. This indicates 

 that the legs are shorter than in any other species of the genus. The 

 tongue is thick, fleshy, and attached, although slightly free at sides and 

 tip. There is a longitudinal groove in the tongue, separating the two 

 papillose portions, of an oval shape, placed side bj" side, with the edge 

 of the tongue projecting beyond them. The papillne form parallel series 

 in each oval oblique to the central groove. This is not found in Ambly- 

 s toma jeffersonianum. 



There are only two patches or lines of palatine teeth. These occupy 

 the middle of the palate, forming an A , the angle anterior and reaching 

 as far forward as the anterior border of the inner nares. The postero- 

 external ends do not pass the inner margin of those nares (in the soft 

 palate, the proportions being a little difterent in the skull). 



Sometimes these two patches form nearly a straight line, or at least 

 the central portion is straight, the lateral bending slightly backwards. 



t 



\o 0/ — II ^1 



Fig. 19, Chondrotus microstomus. No. 3999. Saint Louis, Mo. ; \. 



The color in alcohol is a dark brownish-black, a very little paler be- 

 neath, and thickly and irregularly sprinkled on the sides with plum- 

 beous spots about the size of the eye, of no definite outline. These are 

 less numerous above and below, sometimes nearly wanting ; sometimes 

 they are larger than as described, and look not unlike patches of a gray- 

 ish lichen growing on the sides. 



Measurements. Inches. 



Length along axis of body from snout to angle of mouth 20 



Length from snout to gular fokl 45 



Length from snout to groin 2. 20 



Length from snout to behind anus 2.50 



Length from snout to tip of tail 4. 00 



Length of tail 1.50 



Width of head 31 



Length of fore-arm from elbow 49 



Length of leg from knee 46 



Expanse of hind legs - 1. 45 



