. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Evolution. Fig. 3. (a) Head of Spelerpes macttlicamla, 54 mm. long. (6) Head of Typhhilriton spelaus, 54 mm. long, (c) Head of TypJUomolge ralhbuni, 47.5 mm. long. Rockhouse Cave, and smaller caves in the same neighborhood in southwestern Missouri. It is found under rocks in and out of the water. This is the most interesting form, inasmucli as it is a much more ty[)ical cave animal than Spelerpes, Ijut has not yet reached tlie degenerate condition of Typhlomolge. Its eyes are apparently normal in the larva, but in
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. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Evolution. Fig. 3. (a) Head of Spelerpes macttlicamla, 54 mm. long. (6) Head of Typhhilriton spelaus, 54 mm. long, (c) Head of TypJUomolge ralhbuni, 47.5 mm. long. Rockhouse Cave, and smaller caves in the same neighborhood in southwestern Missouri. It is found under rocks in and out of the water. This is the most interesting form, inasmucli as it is a much more ty[)ical cave animal than Spelerpes, Ijut has not yet reached tlie degenerate condition of Typhlomolge. Its eyes are apparently normal in the larva, but in the adult have undergone marked degen- eration. The eyelids are disappearing and the rods and cones are no longer present in the adult. The eyes of this species will be dealt with below. Typhlomolge raihbuni Stejneger (plate 2, fig. b) is found in the underground streams near San Marcos, Texas. It has been taken from the artesian well at San Marcos and a surface well. It has also been noticed in one of the caves near that place, Ezel's, in which the underground water can be reached. It is said to have come out of some artesian wells south of San Antonio. It is a peren- nibranch and spends all of its time in the water. Its remarkably long and slender legs are not able to support its body when out of the water. Figure 3 shows Bilineatus is frequently found about the caves of Blooraington, Indiana.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Eigenmann, Carl H. , 1863-1927. Washington, D. C. , Carnegie Institution of Washington