107. COTTID.E URANIDEA. 607 



Note. — As hero niulerstood, a wi<l(«-.si)n'a(l and abundant species, varying in dil- 

 forent regions, as is the case with most noii-niigratory species. In this as in others 

 of similar range, the inhabitants of each stream may show local peculiarities. A 

 number of these forms liave received from Dr. Girard specific names, which are 

 acco:npauicd by detailed descriptions. Large collections of these fishes show that 

 numerous similar "species" still exist undescribed, as it is a rare thing to find a speci- 

 men which exactly agrees in all respects with any of the species in Dr. Girard's 

 "Monograph of the Fresh-Water Cottoids." The following forms, of all of which Iho 

 writers have specimens, may possibly bo recognized as "varieties," but of their com- 

 plete iutorgradation we have no doubt : 



Var. richarclHonl (Ag. ) is rather slender, with the vent rather nioi-e posterior than 

 usual, placed midway between the suout and the tip of the caudal; in the others it is 

 nearly midway between the suout and the middle of the caudal. Wisconsin to Lake 

 Superior. 



(Coitus richardaoni Agassiz, Lake Superior, 1850, 300: Coitus richarchoni Girard, 

 Mouograph Fresh-Water Cottoids N. A. 39: Cottus ricliardsoni Giiuther, ii, 1C8 ) 



Var. bairdi (Girard) is small and slender, with the spinous dorsal very low, and the 

 palatine teeth less developed than in the other forms. Cayuga Lake, N. Y., to Ohio. 

 {Cottus hairdii Girard, Proc. Amer. Assoc. Adv. Sci. ii, 1850, 410, and Mon, Cott. 44.) 



Var. tvUsoni (Grd.) is rather stouter, with stronger palatine teeth, and with some of 

 the uppermost of the pectoral rays bifurcate, these being entire in the others. Ohio 

 Valley, Pennsylvania, and Indiana. 



{Coitus wilsoni Grd. 1. c. 42.) 



Var. alrordi Grd. is short and chubby, with the first dorsal rather high, and joined 

 l)y membrane to the second more than in other forms. Common in Wisconsin and 

 Michigan. 



{Coitus aloordi Grd. 1. c. 46.) 



Var. DitTJdJonaZf's (Grd.) is rather robust, with the dorsal fins scarcely connected, 

 and the mouth rather larger, the maxillary extending to opposite posterior border of 

 eye; the preopercular spine is sharp and directed well upward. Pennsylvania to 

 Noi'th Carolina, along the AUeghanies; abundant. 



{Coitus moridionalis Girard, Proc. Amer. Assoc. Adv. Sci. ii, 1850, 410, and 1. c. 47.) 



Var. zophara (.Jor. ) is slender and very dark in color, and more conspicuously varie- 

 gated ; the (irst dorsal high; the palatine teeth well developed. Alabarwa River. 

 {Potamocottus zopherns. lordun, Ann. Lye. Nat. Hist. N. Y. 187G, 320.) 



Var. carolince (Gill) is a very large form, rather robust, rf^aching a length of nearly 

 six inches, without axillary prickles, and with the palatine teeth well developed. 

 The lateral line, as in the otlusr forms, is sometimes continuous aud sometimes inter- 

 rupted. It abounds in the limestone region from Indiana to Tennessee, and is fre- 

 quently found in caves. 



{PotamocoUns caroUn(B (j'\\\, Proc. Bost. Soc. Nat. Hist. 1861, 40: Pokimocoltus caroUnw 

 Gill, Simps. Kept. Ichtli. Utah, 1877, 403.) 



lOGI. U. ^vla<'<»l«ri Cope. 



Uocly slender, entirely smooth. Head not broad; maxillary reaching 

 pupil. Lateral line deflexed below dorsal. Eye large, 5 in head; isth- 

 mus as \vi(h> as distance from pnpil to snout; ])reoper('nlar spine strong. 

 Pectoral longer than head, reaching past front of anal, longer than 

 usual in V. richarihoni. Head 3; depth G^. D. VII-17; A. 12; P. 15, 



