NECTURUS MACULATUS. 427 
have given a definite number of teeth for each dentigerous bone, and Cope (’g9) has even 
employed the number of teeth as a diagnostic between species, but as a matter of fact the 
number is quite inconstant, and it seems probable that the rows are added to upon their 
outer or posterior ends as the animals become older. The result of a series of enumera- 
tions of different specimens may be given in the following tables. 
TasLe A. 
Teeth enumerated in entire specimens. 
Designation Total | 
of Side. | Premaxillary. | Vomer. | Palato-pterygoid. Dentale.  Spleniale. ona Total 
specimen. side. | teeth. 
5 
Rt 12 12 5) 14 6 49 
es L, 12 13 | 5 15 5 50. | 22 
Rt 10 LON 4) 14 6 45 : 
: L u iia 6 Cie 5 Ag) 28 
Rt 10 10. =|} 5 qo 6 45 
ao if u 11 6 15 5 dey. 23 
Rt ) 10 6 13 5 43 
u i 9 11 6 13 5 44 | 87 
Rt 14 15 8 15 il 59 
E L Lb 15 3 16 S 62 | 121 
F Rt 12 13 8 18 ——P — 
if re) 12 7 17 s = | a 
Taste B. 
Teeth counted in isolated bones. 
PMX. Ve Teale, DENT. SPL. 
14 14 7 20 | 7 
Ty ah ai} 8 18 uf 
13 13 8 i | 7 
15 15 9 Tome, 
15 1G) 8 ilge | 6 
16 6 AG eh. 7 
15 6 18 
| ig 17 
average ® | 12.5— | 13.0 | 6.6 15.9+ | 6.2— 
1 These small bones were unfortunately lost in this specimen. 
2The specimens which furnished these isolated bones were generally larger than those used for Table A, which 
accounts for the greater number of teeth. 
3% this average are included the statistics from both tables. 
