OF CONCHOLOGY. 225 



Trypanostoma moriforme^ Lea. April 15, 1862. Constricted 

 on middle of whorl. (C. M. W. & L.) (Two species confounded?) 



* Strephohasis olivaria, Lea. June 3, 1863. Adult ; slender 

 variety, (L.) 



Strephohasis Hm'tmaniana^ Lea. [1870, MSS.] Slender, 

 solid variety ; Tenn. R. (C. M. W. & L.) 



If the above synonymy should be verified, the question of pri- 

 ority lies between Mel. curta, Hald., and 3Iel. turgida, Lea. 



89. Trypanostoma Jilum, Lea. Not very abundant. 



90. Trypanostoma gradatum ? Anthony. A beautiful light 

 yellowish brown shell of 7 or more whorls, with a remarkably 

 twisted columella. The young shells have been confounded with 

 Strephohasis eorpulenta, Anth., from which they differ principally 

 by the prolongation of the anterior portion of the outer lip. The 

 shell at all ages has much the aspect of a Strephoha.ns, but the 

 form of the lip is that of Trypanostoma. My specimens are 

 much larger than the recorded dimensions, and may be unde- 

 scribed. Found on Little River Shoals. Rare. Identification 

 not entirely satisfactory. 



91. Trypanostoma ligatum ? Lea. A few specimens only have 

 been seen, from Little River Shoals. Not authoritatively deter- 

 mined. 



92. Trypanostoma moniUferum ? Lea. Not many. 



93. Trypanostoma parvum, Lea. Little River Shoals and 

 Little River. More numerous in Little River. Specimens pre- 

 sented to Mr. Lea were pronounced by him larger than his origi- 

 nal specimens. 



94. Trypanostoma ponderosum, Anth. I follow Mr. Wheat- 

 ley in adopting Mr. Tryon's synonymy of this species. Fine 

 specimens, identical with Mr. Lea's figure of Try. dux, are not 

 uncommon. 



95. Trypanostoma undulatum., Say. With some hesitation I 

 admit this species among the Holston River shells, confessing 

 my inability to recognize it. 



The following notes relative to habits and distribution, taken 

 from Miss Law's letters, are of interest, and refer principally to 

 Little River Shoals : 



^^ Anculosa \_A. proirosa and yl. ^ tintinnahulum,' Lea] and 

 Angitrema \_A. verrucosa, Raf.] are everywhere tolerably abun- 

 dant in swift, shallow water. Aneidosa virgata, Lea, I have seen 

 nowhere but on the dam in the south part of the Holston [at 

 Little River Shoals] ; Strephohases are scattered throughout the 



* I have an original specimen from Mr. Lea. 



