382 GEOLOGICAL SUEYEY OF THE TEREITOEIES. 



not allow of their distinction from transverse fractures at irregular 

 distances, l^o genital apertures could be detected at the sides or at 

 the margins. Internal organs of any kind could not be seen, but the 

 soft interior tissue of the body is filled with round corpuscles re- 

 sembling in appearance starch-granules. These proved to be com- 

 posed of carbonate of lime, as they were completely dissolved by 

 acetic acid, with the evolution of carbonic acid. From the shape of the 

 head this tape-worm might appropriately be named DibotJirium cordiceps. 



A multitude of leeches were collected during Prof. Hayden's ex- 

 pedition, by two of his assistants, Messrs. Carrington and Dawes, from 

 a lake in Wyoming Territory. These appear to belong to the species 

 discovered by the writer several years since in Twin Lake, Minnesota, 

 and described under the name of Aulastomum lacustris, in the Proceed- 

 ings of the Academy of Natural Sciences of Philadelphia for 1868, p. 

 229. The same leech, I think, I also saw in Lake Superior. 



Mr. Carriugton informed me that the head of a horse thrown into the 

 lake from which he obtained the leeches, in a few hours appeared black 

 from the number of them which adhered to it. 



Thomas Say described two species of leeches obtained during Long's 

 expedition, from small lakes on the high land between Lake Superior 

 and Eainy Lake. These leeches, named Hirudo marmorata and H. late- 

 ralis, in neither case agree in character with the Aulastomum lacustris. 



Several large hair-worms obtained from Fish Creek, Montana, are of 

 the same species as that described from specimens obtained in Kansas 

 by Dr. W. A. Hammond, upward of twenty years ago. These pertain 

 to the largest known Gordius. The female is pale-brown ; the male is 

 dark-brown and has a strongly forked tail. The females of the Kansas 

 specimens ranged from 10 inches to 2^ feet in length ; the males from 8 

 inches to upward of 2 feet. The females of the Montana specimens 

 measure from IJ to 2^ feet iu length ; and a male measures 8J inches in 

 length. The species, under the name of Gordius rohiistus, is described in 

 the Proceedings of the Academy of Natural Sciences of Philadelphia, 

 for 1851, p. 275, and 1857, p. 204 j and in the second volume of the 

 American Entomologist, p. 194. 



COLEOPTERA. 



By Geo. H. HoeNj M. D., Philadelphia. 



In accordance with the request of the chief of the geological survey, 

 Dr. Hayden, the following list of Goleoptera has been prepared. The 

 specimens were collected for the most part by Mr. Cyrus Thomas and 

 other members of the survey from June 1 to July 6 of the present year, 

 over the following route : Starting from Ogden, Utah, through the 

 Salt Lake Basin, by way of Brigham City, Box Elder Creek, Copen- 

 hagen, and Cache Valley ; thence out of the Salt Lake Basin to Port 

 Neuf River and Port Hall by way of Oxford and Marsh Valley; thence 

 up the Snake Eiver to near Henry's Fork; thence by Market Lake 

 and Kamas Creek to the mountains between Idaho ?ind Montana 

 and to Virginia City, in the latter Territory. On reference to the 

 map it will be seen that the route thus incloses an oblong space, inter- 

 mediate between the faunal regions of Oregon and theplains to the 

 eastward of the Eocky Mountains. As miglit be inferred from the 



