440 GEOLOGICAL SURVEY OF THE TERRITORIES. 



eyes are .3 of the head only ; in M. tristis, the anal radii are I. .7 ; in M. 

 couchii, perhaps the closest ally, the depth enters the length 3.5 times; 

 the transverse scales are 7-3, anal rays I. .8. 



The affinities of this species are plainly with such species as Hypsile- 

 pis analostanus, Girard, and Photogenis pyrrhomelas. It is interesting 

 to observe that in its young state it possesses the single tooth of the 

 inner row which characterizes the genus Cyprinella, which thus presents 

 an exact parallelism* to the immature stage of Montana, as no other*char- 

 acters exist to distinguish the genera. I may add that Heckel and 

 Kner have shown that the young teeth of the carnivorous type in Euro- 

 pean Cyprinidce are pectinated. That the same is true of* American 

 genera I have often had occasion to observe. Cyprinella, then, in this 

 respect presents an exact parallelism to Photogenis, or such species as 

 P. pyrrliomelas, which only differ generically in the lack of this pectina- 

 tion at maturity. 



M. jugalis in youth is thus a Cyprinella, and resembles no little 

 the C. billingsiana, Cope, from the same locality. The latter has occa- 

 sionally nine anal radii, and rarely the M. jugalis losing a row of scales 

 above the lateral line, causes a still nearer approach. The smaller eye, 

 deeper body, and color will always distinguish the young of the latter 

 from that of the former. 



ALBTJRNELETJS PERCOBROMTJS, (OOPE ;) Sp. n0V. 



A small species of moderately elongate form, and acuminate muzzle. 

 Ventral fins reaching to line of last dorsal ray, not anal; pectorals 

 nearly reaching ventrals. Scales 7-37-3 ; radii D. I. 8, the first orig- 

 inating opposite the middle of the ventral fins; A. I. 11 (10.) Head 

 3.75 times in length without caudal fin ; depth of body 4.75 times 

 into the same. Eye 3.5 times into head, equal length of muzzle. Mouth 

 oblique, lips equal when closed, end of maxillary extending beyond line 

 of orbit. Pharyngeal teeth 4.2-2.4. Seventeen rows of scales iD front 

 of dorsal fin. Length, M. .05 ; to origin dorsal fin, .023 ; to origin of anal. 

 .0263. 



Color pale, with lateral silver band. Dorsal scales minutely punctu- 

 late; basis of caudal the same, but without black spots. From St. 

 Joseph, Missouri. 



In technical characters this species approaches the A. matutinus, Cope, 

 but that is much more slender in all respects and has smaller dorsal 

 scales. Twenty-five of these cross the back in front of the dorsal fin in 

 A. matutinus, seventeen in A. pereobromus. For an analysis of the species 

 of this genus see Proceedings Amer. Phil. Society, 1870, 4G4. 



In the same collection occurred the percoid fishes Lepomis anagallinus, 

 Cope, and Boleosoma brevipinne, Cope. 



SARCIDITJM SCOPIFERTJM, (COPE;) Sp. et gen. UOV. 



Char, genericus. — Teeth 4-4, hooked, prehensile ; alimentary canal 

 short. No barbels, upper lip projectile ; lower jaw without lip except 

 below the canthi, where is a fleshy lobe on each side. Lateral line 

 present; dorsal fin anterior to the ventrals. 



This genus is allied to Exoglossum and to Photogenis. Its appearance is 

 quite that of the former, especially in the mouth; when examined the rami 

 of the mandible are not found to be united or in contact throughout, as is 

 the case with Exoglossum, but they form the usual arc, but with a more 



* See origin of genera, p. 7. 



