NATURAL SCIENCES OP PHILADELPHIA. 
41 
cardinalibus parvis, accuminatis, crenulatis, in utroque valvule duplicibus ; 
lateralibus longis, lamellatis rectisque ; margarita alba et valde iridescente. 
Hab. — Tennessee River, at Florence, Alabama. B. Pybas. 
Unio nbusensis. — Testa laevi, oblonga, subcompressa, ad latere planulata 
postice tumida et biangulata, valde inaequilaterali ; valvulis subcrassis 
• natibus prominulis ; epiderme nigricante^ striata et eradiata ; dentibus cardi- 
nalibus parviusculis, crenulatis, in utroque valvulo subduplicibus ; lateralibus 
praelongis subcurvisque ; margarita vel purpurea vel salmonis colore tinctil et 
iridescente. 
Hab. — Neuse River, six miles from Raleigh, N. C. Prof. Emmons. 
Unio purus. — Testa laevi, elliptica, subcompressa, postice rotundata, insequila- 
terali ; valvulis subcrassis, antice spissata ; natibus subprominentibus ; epider- 
mide luteo-oliva, glabra, ad umbones polita, obsolete radiata ; dentibus cardi- 
nalibus submagnis, accuminatis, crenulatis, in utroque valvulo subduplicibus : 
lateralibus sublongis, lamellatis subcurvisque ; margarita alba et iridescente. 
Hab. — Neuse River, six miles from Raleigh, N. C. Prof. Emmons. 
Unio exactus. — Testa lievi, elliptica, compressa, postice rotundata, inaequila- 
terali; valvulis subcrassis; natibus prominulis; epidermide tenebroso-rufa, 
striata; dentibus cardinalibus parviusculis, crenulatis, in utroque valvulo du- 
plicibus, lateralibus sublongis, lamellatis subrectisque ; margarita alba et irides- 
cente. 
Hab. — Neuse River, six miles from Raleigh, N. C. Prof. Emmons. 
Descriptions of a New Helix and Two New Planorbes. 
BY ISAAC LEA. 
Helix Clarkii. — Testa superne rotundatd, inferne piano- convexa, regu- 
lariter striata, brunneo-cornea, imperforata, unodpntata : anfractibus septenis, 
oblique striata; apertura lunata, subdilata; labro albido, reflexo, inferne 
calloso ; columella in medio uno-dentata, ad basim impressa. 
Hab — Tuskee Cove, Cherokee County, North Carolina. Prof. D. Christy, 
Hamilton, Ohio. 
Planorbis Wheatleyi. — Testa parva, tenubroso-cornea, planulata, obsolete 
striata, bicarinata, superne depre~sa, inferne late et profundite umbilicata ; 
anfractibus quinis, superne obtuse carinata, inferne acute carinata ; apertura 
albida, crassa et valde constricta, intus sexdentata. 
Hab. — Cotoma Creek, Montgomery County, Alab. C. M. Wheatley. 
Planorbis Newberryi. — Testa pallido-cornea, depresso-turrita, minutissime 
striata, superne et inferne acuto-carinata, late et profundite umbilicata; an- 
fractibus quinis, planulatis ; apertura magna, pallido cornea, subtriangulari. 
Hab. — Klamath Lake and Canoe Creek, California. J. S. Newberry, M. D. 
Descriptions of New Organic Remains collected in Nebraska Territory in tHie 
year 1857, by Dr. F. V. Hayden, Geologist to the Exploring Expedition under 
the command of Lieut. G. K. Warren, Top. Engr. U. S Army, together witli 
some remarks on the Geology of the Black Hills and portions of the surround- 
ing Country.* 
BY F. B. MEEK AND F. V. HAYDEN. 
After leaving the great area of comparatively low country composed of nearly 
horizontal Tertiary and Cretaceous formations, lying between the Missouri and 
the Black Hills, the geologist, on approaching the latter, soon begins to see in 
^Washington, D. C, March 1, 1858. 
Capt. A. A. Humphreys, Top. Eng. in charge Off. Expl'n and Surveys. 
Sir : The accompanying paper, by Messrs. F. B. Meek and F. V. Hayden, descrip- 
tive of New Organic Remains discovered by the exploration in Nebraska, organ- 
ized by the War Department and placed under my command in May last, 
1858.] 
