Smithsonian miscellaneous collections . Fig. 43.—Ericymba biiccata. After Jordan and Evermann. it does occur, is tolerably common and locally very rarely attains a length of five inches. The interest of this genus is in the fact that it repeats in the familyof Cyprinids a characteristic which is manifest in isolated generaof a number of other families, but notably in the fresh-water Percids(as in Acerina or Cernua) and Cichlids (as in the Trematocara ofLake Tanganyika). It will be an interesting study for future natural-ists to investisrate the correlation between this structural f
Smithsonian miscellaneous collections . Fig. 43.—Ericymba biiccata. After Jordan and Evermann. it does occur, is tolerably common and locally very rarely attains a length of five inches. The interest of this genus is in the fact that it repeats in the familyof Cyprinids a characteristic which is manifest in isolated generaof a number of other families, but notably in the fresh-water Percids(as in Acerina or Cernua) and Cichlids (as in the Trematocara ofLake Tanganyika). It will be an interesting study for future natural-ists to investisrate the correlation between this structural feature. Fig. 44.—Horny Head, Hybopsis kentuckiensis. After Goode. and habits and to ascertain whether the analogous structures areadaptive to identical or different conditions. Cope evidently assignedtoo much relative importance to the character by giving to itsubfamily rank and isolating the genus from all others. 304 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vol. 48 Closely related to Notropis is the genus Hybopsis which includesnearly a score (seventeen) of species. Like Notropis it has aprincipal row of four pharyngeal teeth, and in some a single toothrepresents a second row, but sometimes there is none (4—4 orI, 4—4, I or I, 4—4, o), and the teeth are essentially like those ofNotropis; it differs from the kindred genus by the development ofa barbel at the end of each maxillary bone. The best known species is the Hybopsis kentuckiensis, popularlyknown as the horny-head, jerker, river chub, and Indian chub. Itranges from Pennsylvania to Wyoming and Alabama, on both
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