NATURAL SCIENCES OF PHILADELPHIA. 5 



diapbana ; spira acuto-conica, mucronata. ; suturis valde impressis ; anfracti- 

 bus instar novenis, carinatis, superne striatis; apertura. parviuscula, rhoni- 

 boidea, ; labro acuto, sinuoso ; columella aliquanto incrassata et contorta. 



Hub. Bull Run, tributary to Clinch River, E. Tennessee, Major S. S. Lyon, 

 U. S. E. 



Strephobasis Lyonii. Testa l& 3 vi, subcylindracea,, crassa, tenebroso-cornea 

 vel oliva, raro vittata; spira obtuso-couica; suturis impressis; anf'ractibus 

 octonis, convexiusculis ; apertura subconstricta, rhomboidea, intus albida, raro 

 vittata j labro acuto, aliquanto sinuoso; columella interne incrassata, ad basim 

 canaliculata, et retrorsa. 



Hab. Holston River at Knoxville, E. Tennessee, Major S. S. Lyon, U. S. E. 



Description of and Bemarks on PLANORBIS NEWBERRYI. 

 BY ISAAC LEA. 



Planorbis Newberryi. Testa pallido-cornea; depresso-turrita, minutissime 

 striata, superne et inferne acuto-carinatu,, late et profundite umbilicata, ; an- 

 fractibus quiuis, superne planulatis ; apertura magna, pallido-cornea, sub- 

 triangulari. 



Shell pale horn-color, slightly turrited, very finely striate, sharply carinate 

 above and below, widely and deeply umbilicate, whorls five, flattened above ; 

 aperture large, pale horn-color and subtriangular. 



Planorbis Newberryi, Lea, Proc. Acad. Nat. Sci., 1858, p. 41. 



Hab. Klamath Lake and Canoe Creek, California, J. S. Newberry, M. D. 



My cabinet and cabinets of Smithsonian Institution and Dr. Newberry. 

 Diam. *55, Length -42 of an inch. 



Remarks. This is a very remarkable shell, and I have placed it among the 

 Planorbes until the soft parts may be observed in a living state ; they may be 

 found to differ from the true Planorbes* Some specimens preserved in alco- 

 hol have been carefully examined, but the parts are so rigid that it could not 

 be satisfactorily done. The tentacula do not, however, seem to be so long as 

 is usual in the Planorbes. The epidermis is very thin on the upper part of the 

 whorls, and the striae there are backwards in curves, and on the lower part 

 slightly forwards. The upper carina forms an acute angle, the edge being 

 cord like ; the lower one is still more acute. In most of the specimens there 

 are two obscure carinations on the whorls between the acute ones. The um- 

 bilical region is very remarkable, the perforation extending to the apex of the 

 slightly elevated spire, the apex itself being frequently wanting, owing to 

 corrosion occasioned by the attacks of some small enemy eating into the sub- 

 stance of the hard part. The upper angle of the whorls is elevated slightly 

 above the plane of the whorls, thus forming a Babylonic appearance. This 

 gives the shell the appearance of some forms of the Trochi. 



This very curious and interesting species is among the MoHusca brought by 

 J. S. Newberry, M. D., attached to the Pacific Railroad Survey under the com- 

 mand of Lieut. R. S.Williamson, U. S. A., and I have great pleasure in dedicat- 

 ing it to Dr. Newberry, who has done so much to elucidate the Natural History 

 of California and Oregon, when on these expeditions so creditable to the 

 Government. 



* Provisionally it may be called Megasystropha, from Mtya, magnus, and 

 <rutop>i, vortex, the umbilicus being large and vortex like. 



1864.] 



