434 Lake Maxinkuckee, Physical and Biological Survey 



examination of the type of H. scierus and a comparison of it with 

 numerous specimens both of H. aspro and H. scierus. The type of 

 H. scierus has faded so that little can be judged concerning its 

 colors. It is still in a perfect state of preservation, though some- 

 what soft. 



The mouth does not differ greatly in size from those of our 

 specimens of both species. The maxillary extends almost to the 

 vertical of the anterior of the orbit, and the statement in the 

 original description "maxillary not reaching the eye by about the 

 width of the pupil", evidently does not refer to the vertical from 

 the anterior edge of eye, but to the width of the preorbital. The 

 statement that the "spinous dorsal [is] separated from the soft 

 dorsal by the length of the snout" is true only if the spinous dorsal 

 is supposed to end at the base of the last spine; the mem- 

 brane of the spinous dorsal is attached very nearly to the 

 origin of the soft dorsal, there being barely more than the width 

 of a scale between them. This is well shown in the very good 

 figure of Hadropterus scierus in Jordan and Evermann's Fishes 

 of North and Middle America. As has been said, the union of the 

 gill-membranes is a variable feature. 



The following is a description drawn up from an examination 

 of 5 Outlet specimens: 



Head 4 in length; depth 6.1; eye 3.9 to 4.8 in head; snout 3.9 

 to 4.6; maxillary 3.5 to 4 in head, almost or wholly reaching to a 

 vertical with anterior of eye ; mandible 2.5 to 3 ; interorbital 5.1 

 to 5.5, preorbital 7.1 to 9.1; dorsal XI to XIII-11 to 13; scales 6 

 to 9-62 to 69-10, 5 to 7 rows of minute scales on cheek; 6 or 7 

 larger scales on opercle; 12 to 15 rows of scales before dorsal; no 

 row of scales along median dorsal line, but a row along each side ; 

 scales small and crowded in front of dorsal, the scales in the lateral 

 line somewhat smaller than the other scales of the body, thus break- 

 ing the alignment of the diagonal rows; small intercalated scales 

 along base of dorsal, breaking up the regularity of the series; 

 snout and interorbital space naked ; occiput naked, this portion fre- 

 quently transparent so that the outlines of the underlying brain 

 can readily be seen; scales rather small, each scale with 2 or 3 

 fine concentric lines around the center, the whole margin of the 

 scale, about ^ of the way to the center, rough, the roughness con- 

 sisting of radiating faintly beaded ridges terminating in small 

 stout spines which project from the entire free circumference of 

 the scale, the scale somewhat irregularly beaded in front of the 

 center ; throat, chin and fin membranes naked ; breast with minute 

 embedded scales; one. to 3 large stellate chevron-like scales be- 



