90 



PROCEEDINGS OP UNITED STATES NATIONAL MUaETLAI. 



the inuer surface rougliened, scarcely dentate. Braiicbiostegals six. 

 Maxillary with a small but perfectly distinct supplemental bone. Eye 

 very small, considerably less than length of snout (perhai)s an individ- 

 ual character). Nostiils in line with pupil. Preorbital quadi%te, mostly 

 below line of jnipil : preoperculum moderately large, lower angle rounded, 

 very slightly obtuse. Scales on cheeks moderate, in six to seven rows. 

 Opercle rather large, triangular, with the posterior angle produced into 

 a rounded bony flap, nearly equaling the snout in length. The flap is 

 of a shiuy black color as in L. cyaneUus, surrounded by a very broad 

 membranous margin, which is white in the alcoholic specimen. Scales on 

 the opercle large, in tive rows. Suboperculum of nearly the same width 

 throughout, with a single row of scales. Interoperculum wider than 

 subo])erculum, with abouta rowand a half of scales. Scales continued up- 

 wards a short distance between oi)ercle and preopercle. Spine of the 

 premaxillary stout and broad ; width at base equal to one-third of inter- 

 orbital space, moderately long, reaching to posterior nostril. Mucous 

 channel from eye to suprascapular bone extremely narrow, scarcely sep- 

 arating the scales. Scales moderately large, ctenoid. Dorsal begin- 

 ning over base of pectorals. Dorsal and anal somewhat obliquely op- 

 posed. Spinous portion of dorsal fin low, the longest spine reaching 

 very little past margin of eye. Spines not very stout, nearly straight ; 

 all but the first two of nearly the same height. Soft i^ortion of dorsal 

 much higher than spinous, reaching greatest height at seventh and 

 eighth rays, behind which it descends abruptly. Both caudal j)eduncle 

 and fin sTiort and stout. Soft portion of anal rounded. Insertion of 

 ventrals behind base of pectorals, not reaching beyond vent. Pectorals 

 short, only reaching vent. Scales in front of pectorals not much re- 

 duced, considerably larger than those on cheeks. The description of 

 the species is taken from a single specimen, No. 4109, in the United 

 States National jMuseum, from Fort Gratiot, Michigan, at the foot of 



Lake Huron. 



Table of Measurements, 



Species: Lepomis euryorus. 



Current number of specimen 

 Locality 



Dimensions. 



Extreme length. 



Body : 



Greatest height 



(xrcaiest wi(lth 



Jjeast heijjht ol' tail 



Length ol caudal peduncle 



Head : 



Greate.st length without ear-flap. 



Distance trorii snout to nape 



Greatest width 



Widl h of interorbital area 



Length of snout 



Leugt h of ear-flap 



Length of maxillary 



4109. 

 Fort Gratiot, Michigan. 



Inches and 

 lOOths. 



6x% 



lOOth.s of 

 length. 



43 



16i 



13Jr 



13 .V 



