39. EEICYMDA. 185 



voiitrals. A dark dorsal stripe from the nape to the caudal ; a 

 grcyisli, diffuse, longitudinal hand above the lateral line. Pharyngeal 

 teetli 4—4. 



Illinois ; Iowa ; Missouri. 



a-h. Adtilt. From Dr. Parnell's Collection. 



b. Young, 1| inch long. Burlington, Iowa. Presented hy Th. Moore, 

 Esq. 



2. Hybognathus regius. 

 Hybognathus regius, Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 209. 

 D. 11. A. 11. L. lat. 38. L. transv. 6/ ?. 

 Body elongated, compressed, its depth being one-fifth or rather 

 less than one-fifth of the total length (without caudal) ; the length 

 of the head is one-sixth of the total. Mouth quite small. Origin of 

 the dorsal fin a little anterior to that of the ventrals, and nearer to 

 the tip of the snout than the base of the central rays of the caudal. 

 There are four longittidinal series of scales between the lateral lino 

 luid the root of the ventral. Coloration unifonn. {Girard.) 

 Pharyngeal teeth 4 — 4. 

 Maryland, U. S. 



3. Hybognathus perspicuus. 



Hvborhvnchus perspicuus, Girard, Proc. Ac. Xat. Sc. Philad. l-'.5fi, 

 p. 170 ; or U. St. ^- Pac. R. R. E.vped. Fish. p. 231, pi. 52. tigs. 10-20. 



D. 11. A. 9. 



Scales of moderate size. The height of the body equals the length 

 of the head, which is a little less than one-fourth of the total length 

 (without caudal). Snout not longer than the large eye, which is 

 about one-third of the length of the head. The origin of the dorsal 

 fin is opposite to that of the ventrals, and appears to be a little nearer 

 to the end of the snout than to the root of the catidal fin. A black 

 spot at the base of the caudal and on the anterior margin of the 

 dorsal. (Girard.) 



Arkansas lliver. 



39. ERICYMBA. 



Ericjniba, Coj)e, Proc. Ac. Xat. Sc. Philad. 18G5, p. 87. 

 Scales of moderate size ; lateral line complete. Doi-sal fin short, 

 without spine, not in advance of ventrals. Anal fin short ; mnuth 

 inferior; intermaxillarics protractile; barbels none; mandibulaiy 

 and opercular bones with external rauciferous cavities separated by 

 s>eptary laminte. Pharyngeal teeth hooked 4 . 1 — . 4. 

 United States. 



1 . Ericymba buccata. 



Cope, I.e., and Joiini. Ac. Xat. Sc. Philad. xiii. p. .'!(>!, pi. 1.1. ivj:. A. 

 D. 9. A. 9. Y. 8. L. lat. 33. L. transv. .5,?. 

 The height of the body is contained nearly five times in the tutul 

 length (witliout caudal), the length of tlie head thrice and live- 



