2 University of Michigan 



rior lingual lamina with a single transverse element, provided 

 with minute rounded denticles ; anal fin well developed, partic- 

 ularly in the female. 



Habitat : Southern ^Michigan. 



Type Speciuicn : Cat. Xo. ^S^yy, AFuseum of Zoology, Uni- 

 versity of ^lichigan; I\Iill Creek. 'Washtenaw County, Alichi- 

 gan; ]\Iay, 1905; Jacob Reighard, collector. 



Description of Type Specimen ■} (PL I, fig. i.) Length, 121 

 mm. ; tip of snout to vent, 67.76 ; tip of snout to anterior margin 

 of dorsal, 45.59; last gill opening to vent, 47.1 1 ; last gill open- 

 ing to anterior margin of dorsal, 28.92 ; tip of snout to first gill 

 opening, 9.92; tip of snout to last gill opening, 20.66; width of 

 body immediately behind branchial basket, 5.78; depth of body 

 immediately behind branchial basket, 7.44; diameter of eye, 

 1.24; tip of snout to anterior margin of orbit, 5.78; tip of snout 

 to nasal pit, 4.55; antero-posterior diameter of buccal funnel, 

 5.6; transverse diameter of buccal funnel, 5.5. Muscular im- 

 pressions betv/een last gill opening and vent, 49. Disc bordered 

 by fimbriae arranged in a single row except anteriorly, where 

 they tend to form a double row; anterior ones (PL II, fig. 2) 

 simple or biramous, with an increase in size and number of 

 lobes posteriorly; extremities of lobes l)lunt ; lobes of adjacent 

 fimbriae sometimes fused. A prominent lip-like fold within 

 fimbriae forming outer boundary of disc. Extraorals (I'l. II, 

 fig. I ) 5 on right side and 4 on left, larger than disc teeth, low, 

 blunt, borne on papillae with distinct boundaries. Disc teeth 

 low. blunt, arranged in radiating lines; each line composed of 

 three teeth except i)Osteriorly, two; those in posterior portion 

 of disc and the marginal ones anteriorly and laterally nearly 

 obsolete. vSupraoral lamina narrow, well imbedded within the 



' Throughout this description the proportions are inilicated in liundredths of 

 the total length, which includes the caudal fin. 



