62 SUPPLEMENT TO ISAAC LEA'S PAPER ON UNIONID^. 



GoNioBASis Lawrencei. pi. 21, fig. 17. 



Testa Isevi, subcylindracea, subcrassa, tenebroso-cornea, dilute vittata vel evittata; spira elevata ; 

 suturis impressis; anfractibus planulatis ; apertura parviuscula, rhomboidea, intus albida ; labro 

 acuto, sigmoideo ; columella inerassata et contorta. 



Shell smooth, subcylindrical, rather thick, dark horn color, faintly banded or 

 without bands; spire raised; sutures Impressed ; whorls flattened; aperture rather 

 small, rhombic, white within ; outer lip acute, sigmoid ; columella thickened and 



twisted. 



Proc. Acad. Nat. Sci., 1869, p. 125. 



Hah. — Washita River, near Hot Springs, Arkansas, Dr. Lawrence. 



My cabinet and cabinet of Smithsonian Institution. 

 Diam. -3, Length 1 inch. 



Remarks. — Ten specimens were sent by the Smithsonion Institution, not one of 

 which was nearly perfect, but some were sufficiently so to satisfy me of its being 

 undescribed. One only had bands, three in number and indistinct. The epidermis 

 in all is uniformly of a solid polished appearance. The basal channel is wide and 

 turned back, and resembles G. Chrystii (nobis) in this character. The specimens 

 were all too much eroded to enable me to ascertain the number of whorls. The 

 upper whorls may in perfect specimens be found to be folded or carinate. Aper- 

 ture about one-fourth the length of the shell. 



GONIOBASIS BACULOIDES. PI. 21, fig. 18. 



Testa Isevi, cylindracea, subtenui, luteola, quadrivittata ; spira valde elevata; suturis irregulariter 

 impressis ; anfractibus planulatis ; apertura parva, rhomboidea, ititus vittata et cseruleo-alba ; 

 labro acuto, vix sinuoso ; columella vix inerassata, contorta. 



Shell smooth, cylindrical, rather thin, yellowish, four banded ; spire much ele- 

 vated ; sutures irregularly impressed ; whorls flattened ; aperture small, rhombic, 

 banded and bluish -white within; outer lip acute, scarcely sinuous; columella 



slightly thickened, twisted. 



Proc. Acad. Nat. Sci., 1869, p. 125. 



jlah. — Coosa River, Alabama, Dr. E. R. Schowalter. 



My cabinet and cabinets of Dr. Schowalter and Mr. Wheatley. 

 Diam. -4, Length 1-2 inch. 



Remarks. — Two specimens only of this fine species were sent to me by Dr. 

 Schowalter. It must be rare in the Coosa, as he has only recently found it after 

 so many years' explorations. It has some resemblance to fascinans (nobis), but 



