NEW MELANIDiE OF THE UNITED STATES. 341 



and differs in being maculate instead of banded. The aperture is about one-third 

 the length of the shell. I dedicate this to my friend Mr. Canby, who kindly 

 brought me some specimens. 



Goniobasis Couperii. PI. 38, fig. 205. 



Testa tuberculata, plicata, inferne et superne striata, turrita, tenui, tenebroso-fusca, ad basini vittata ; 

 spira turrita ; suturis valde impressis ; anfractibus septenis, subcarinatis, ad peripheriaui et supra 

 compresso-tuberculatis; apertura parvissima, subrhomboidea, intiis tenebrosa et uno-vittata- labro 

 crenulato, valde sinuoso; columella incurva, contorta et purpurescente. 

 Shell tuberculate, plicate, striate above and below, turreted, thin, dark brown, 

 banded at the base; spire turreted; sutures very much impressed; whorls seven, 

 subcarinate, with compressed tubercles on and above the periphery ; aperture very 

 small, subrhomboidal, dark and single-banded within; outer lip crenulate, very 

 sinuous; columella bent in, twisted and purple. 

 Proc. Aead. Nat. ScL, 1S62, p. 271. 

 Hah. — Etowah River, Mr. Couper, by J. Postell. 

 My cabinet and cabinet of Mr. Postell. 

 Diam. -27, Length -72 inch. 



Remarlts. — This ornamented little species was sent by Mr. Postell with the 

 Canhyi, which he found also in Etowah River. They are closely allied, but 

 Couperii is slimmer, has more striae above the periphery, which are all cut bv the 

 folds, thus filling the spire with small, compressed tubercles. It differs also in 

 being much darker, in not beiug maculate and in having a broad band near the 

 base which is well marked inside. Below the periphery there are six well-defined, 

 raised revolving striae. The aperture is not quite one-third the length of the shell. 

 Mr. Postell informs me that this species, as well as Canhyi and Downieana, from 

 Etowah River, were brought some years since by Mr. Couper, son of James 

 Hamilton Couper, Esq., of Hopeton, near Darien, and I have great pleasure in 

 naming this species after him. 



Goniobasis Downieana. PI. 38, fig. 206. 



Testa tuberculata, subturrita, superne clatbrata et subcarinata, inferne transverse striata, tenui, dilute 



fusca ; spira conoidea, clathrata ; suturis irregulariter impressis ; anfractibus septenis, subcarinatis, 



ad peripheriam et supra compresso-tuberculatis ; apertura submagna, ovato-rhomboidea, intiis albida • 



labro crenulato, sinuoso ; columella incurva et contorta. 



Shell tuberculate, subturreted, clathrate and subcarinate above, transversely 



striate below, thin, pale brown; spire conical, clathrate; sutures irregularly 



impressed; whorls seven, subcarinate; compressed tuberculate on and above the 



periphery; aperture rather large, ovately rhomboidal, whitish within; outer lip 



crenulate, sinuous ; columella bent in and twisted. 



Proc. Acad. Nat. Sci., 1862, p. 272. 



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