224 AMERICAN JOURNAL 



84. Strepliohasis corpulenta, Anthony.* Little River Shoals. 

 Rare. I have young specimens of this species that closely 

 resemble Mr. Lea's figure of Trypanostoyna 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 canaliculatum, Say. 



88. Trypanostoma curtum^ Hald. Recorded by Mr. Try on as 

 Strepliohasis 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 Anculosa 

 pra^rosa, 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. 



3Ielania carta, I{;i\(\. Date? Locality? 



t [H.] Mela.nia turgida, Lea. June 18, IS-IL Young short 

 and wide ; apex entire. (L.)J 



[H.] Melania picta. Lea. 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. i\.pril 15, 1862. Young shells ; 

 no bands. (C. M. W.) 



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

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



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

 slender var. ; Ohio River. (L.) 



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

 young. (C. M. W.) 



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

 young; apex entire. (L.) 



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

 satisfactorily determined. 



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



J L. = Lewis, C. M, W. = Wheatley. 



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

 Lea, by Mr. Lea, 



