THE NAUTILUS. 11 



Group of Anculosa prarosa Say. 



1 A. PRJEROSA Say, 1824. 



Synonyms : Melania cruentata Menke, 1828 ; Melania angu- 

 losa Menke, 1830; Anculotus angulatus Conrad, 1834; Mela- 

 nopsis neritiformis Deshayes, 1838; Melania cincinnatiensis 

 Lea, 1838. 



2 A. TINTINNABULUM Lea, 1834. 

 3 A. TRYONI Lewis, 1870. 

 4 A. PINGUIS Lea, 1852. 

 5 A. TROOSTIANA Lea, 1841. 



6 A. PLANISPIRA Anth., 1854. 



The figure given of this species by Tryon suggests a variant 

 very common among the prccrosa of the Holston and Cumber- 

 land rivers. The Green river material mentioned in Tryon is 

 Lithasia obovaia, Say with the spire worn away. 



7 A. LEWISII Lea, 1861. 



8 A. VIRIDULA Anth., 1860. 



Cited from Tennessee. It suggests some of the forms taken 

 by A. picta Conrad in the Alabama river. Tryon links it 

 with kirtlandianus Anth. of the carinata group. 



9 A. UMBILICATUS Wetherby, 1876. 

 10 A. HARPETHENSIS Pilsbry, 1896. 



11 A. SUBGLOBOSA Say, 1825. 



Synonym : Melania globula Lea, 1841. 



12 A. GIBBOSA Lea, 1841. 



A form from Abram's creek, Blount county, Tenn., is the 

 only one I have seen which consistently corresponds with the 

 description of this species, 



13 A. LITTORINA Hald., 1840. 



Synonym: Melania pilula Lea, 1841. 



It seems to me to be of significance that this species, re- 



