274 NEW MELANID/E OF THE UNITED STATES. 



My cabinet and cabinets of Bishop Elliott and Dr. Hartinan. 

 Diam. -38, Length I'll inch. 



Remarks. — A number of specimens were received from the above mentioned hab- 

 itats ; all varying very little. It is closely allied to Cliristyi herein described, but while 

 it nearly agrees in color, it is usually smaller and has more convex whorls. These 

 are, in some specimens, more inflated on the lower part. It has a strong re- 

 semblance to M. strigosa (nobis), but is larger, and the aperture is more twisted at 

 the base of the columella. The aperture is about one-fourth the length of the shell. 

 I have great pleasure in naming this species after my deceased friend, President 

 Estabrook, of Knoxville, from whom I first received it many years since. 



Trypanostoma Knoxvillense. PL 36, fig. 87. 



Testa lsevi, subulari, subtcnui, pallido-cornea ; spira attenuato-conica, mucronata, ; suturis regulariter im- 

 pressis; anfraotibus denis, convexiusculis, ad apicern carinatis, ultimo subconstricto ; apertura parva, 

 subrbomboidea, iintiis alba; labro acuto, sinuoso; columella inferne incrassata et parum contorta. 



Shell smooth, subulate, rather thin, pale horn-color ; spire attenuately conical, sharp- 

 pointed ; sutures regularly impressed ; whorls ten, slightly convex, carinate towards 

 the apex, the last somewhat constricted ; aperture small, subrhomboidal, white within ; 

 outer lip acute, sinuous ; columella thickened below and a little twisted. 

 Proc. Acad. Nat. ScL, 1862, p. 173. 



Hah. — Knoxville, Tennessee, Pres. Estabrook. 



My cabinet. 

 Diam. -30, Length -80 inch. 



Remarks. — A single specimen only of this species was received from President Esta- 

 brook. It is closely allied to Estabrookii, herein described, but may be distinguished 

 by the form of the inferior part of the columella and the channel being more 

 drawn backwards. It is a smaller species, of rather lighter horn-color and the whorls 

 are rather more bulging. The aperture is less than one-third the length of the shell. 



Trypanostoma attentjatum. PI. 36, fig. 88. 



Testa ltevi, subulari, subteuui, cornea; spira attenuata; suturis impressis; anfractibus novenis, vix con- 

 vexis, ultimo parvo ; apertura parva, rhomboidea, inttis albida; labro acuto, valde sinuoso; columella 

 vix incrassata et contorta. 



Shell smooth, subulate, rather thin, horn-color; spire attenuate ; sutures impressed ; 

 whorls nine, scarcely convex, the last small; aperture small, rhomboidal, white 

 within ; outer lip acute, very sinuous ; columella slightly thickened and twisted. 



Operculum small, ovate, dark brown, with the polar point near the base. 

 Proc. Acad. Nat. Sci., 1862, p. 174. 



Bah. — Lafayette, Georgia, Rev. G. White, and Tennessee, Dr. Hartinan. 



