Occasional Papers of the Museum of Zoology 3 



lleshy suproaral papilla, with two cusps, one in the center of 

 each half of supraoral papilla; cusps low, blimt, of about same 

 size as extraorals. Inf raoral lamina crescentic, bearing 9 round- 

 ed cusps of unequal size. Anterior lingual lamina a single bi- 

 crescentic plate, with an anterior median prominence; minutely 

 denticulated; the anterior element as found in more typical 

 members of the genus either lacking or so nearly obsolete as to 

 be overlooked. Anterior and posterior tins united, with a notch 

 in front of vent ; posterior dorsal continuous with caudal. Tip 

 of snout to middle of dorsal notch, 66.12; tip of snout to mid- 

 dle of dorsal-caudal notch, 92.97; greatest height of anterior 

 dorsal, 2.48 ; height of dorsal at middle of notch, 2.07 ; greatest 

 height of posterior dorsal, 4.14. Anal lin continuous with 

 caudal, greatest height, 1.24. Sensory papillae indistinct; one 

 series above each eye, directed postero-dorsally ; a series be- 

 neath eye, curving upward and directed anteriorly; a series 

 continuing as a broken Ime below end of last to tip of snout; 

 none distinguishable on ventral surface of body. Urinogenital 

 papilla prominent. Color in life uniform grayish-brown over 

 entire surface posterior to vent, two-thirds the distance down 

 sides between vent and last gill opening, and half way down in 

 region of gill openings and snout ; elsewhere light yellowish- 

 brown except for a narrow^ line of grayish brown connecting 

 gill openings; tins grayish-brown, lighter than body color. 



Notes on Parotypes : Besides the type fifteen adults have 

 been examined as follows, eleven females and three males from 

 ^lill Creek, Alay, 1905, and one female from the Huron River, 

 near Ann Arbor, April 22,, 1912. (Cat. Nos. 4368-48376, 48378- 

 48383, Museum of Zoology, University of Michigan.) There 

 are some variations in the material. The extraorals vary in 

 inuiiber from 4 to 6 ; a noteworthy fact is the frequent lack of 



