224 AMERICAK JOURNAL 



84. S'trephobasis corpulenta, Anthony.* Little River Shoals. 

 Rare. I have young specimens of this species that closely 

 resemble Mr. Lea's figure of Trypanostoma napoideum. 



85. Strepliohasis Lyonii, Lea. Little River Shoals. Abun- 

 dant. 



86. Trypanostoma affine, Lea. I admit this species in defer- 

 ence to Mr. Wheatley. 



87. Trypanostoma canalieulaium^ Say. 



88. Trypanostoma curtum, Hald. Recorded by Mr. Tryon as 

 iStrephobasis curta, Hald. Dr. Hartman, basing an opinion on 

 the form of the opercle, and its connection with the proligerous 

 lobe, is disposed to regard this species as a Trypanostoma. The 

 species is remarkable for its numerous varieties, many of which 

 appear to be entirely local, as has been remarked of Aneulosa 

 prcerosa., Say. 



I venture to suggest the following synonymy, not as being 

 entirely conclusive, but as being in many particulars deserving 

 of inquiry : 



Trypanostoma curta^ Hald. Dr. Hartman's MSS. 



Melania curta, Hald. Date ? Locality ? 



t [H.] Melania turgida, Lea. June 18, 1841. Young short 

 and wide ; apex entire. (L.)| 



[li.^ Ifelania pieta,Jjesi. June 18, 1841. Banded variety. (L.) 



Melania solida, Lea. May 2, 1845. Adult, wide and solid ; 

 apex eroded. (L.) 



Strephobasis solida, Lea. April 16, 1861. 3Iel. solida, Lea, 

 redescribed. (L.) 



Trypanostoma simplex, Lea. April 15, 1862. Young shells ; 

 no bauds. (C. M. W.) 



Trypanostoma 7ninor, Lea. April 15, 1862. Y^oung shells ; 

 no bands ; var. (C. M. W.) 



§ Trypanostoma pmnilum, Lea. April 15, 1862. Banded, 

 slender var. ; Ohio River. (L.) 



Trypanostoma bivittatum, Lea. April 15, 1862. Two banded, 

 young. (G. M. W.) 



[H.] Trypanostoma troekulus, Lea. April 15, 1862. Wide, 

 young; apex entire. (L.) 



* Recent specimens raise grave doubts if the shells here referred to are 

 satisfactorily delerniined. 



t Species credited to the Holston are preceded by the letter H. 



t L. = Lewis. C. M. W. = Wheatley. 



I 1 have specimens from the Holston River, labeled Try. pumilum, 

 Lea, by Mr. Lea. 



