THE NAUTILUS. 127 



Binney's description of his Melantho coarctata, is very apt and 

 his figures, (fig. 106), are excellent, though smaller than the 

 species frequently attains in its maximum development. For 

 this reason and because there is no locality indicated for the 

 shells figured by Binney, I have chosen as the types a series 

 from the Yallabusha River, Grenada Miss., collected by Hinkley. 



The figured type, apex eroded and with only three whorls re- 

 maining, measures alt. 38.75, diam. 23.5 mm. I have before 

 me a specimen from Village Creek, Hardin Co. Texas, collec- 

 ted by Singley, which, with only two whorls remaining, meas- 

 ures alt. 42, diam. 25.5 mm. 



Campdoma lewisii is an abundantly distributed species in the 

 southern states, ranging west from Alabama, through Missis- 

 sippi and Louisiana, to Texas and north to Missouri and (pos- 

 sibly) to southern Illinois, (See Baker, Bull. Ills. St. Lab. N. 

 H., vii, 1906, p. 89). Apparently it flourishes to the best ad- 

 vantage in the warm waters of the southern rivers as the speci- 

 mens from Mississippi and Texas are larger and heavier than 

 those from northern Alabama and Arkansas. 



Compared with subsolidum, which it apparently replaces in 

 the Gulf States, it is a thinner, lighter shell, the spire is usually 

 more or less flattened and the suture less impressed and the 

 whorls lack the shoulder, which is usually well marked in sub- 

 solidum. It is more closely related to decisum but differs in size, 

 shape and texture, the suture is less impressed, the spire more 

 produced, the body whorl proportionately longer and the aper- 

 ture is a more elongated oval. 



I have it before me from the following localities : Flint River, 

 Gurley ; and the Tombigbee River, Demopolis, Ala. ; Big Black 

 River, Durant ; Tombigbee River, Columbus ; Tallahatchee 

 River, Abbeville ; Yallabusha River, Grenada ; Pearl River and 

 Conway's Slough, Jackson and a branch of the Tangipahoa 

 River, Pike Co., Miss.; Lake Bisteneau, Bienville, La.: Caddo 

 Lake and Village Creek, Hardin Co., Texas, Cypress Creek, 

 Ouachita River and Old River, Arkadelphia ; Big Deciper Creek, 

 Clark Co. ; Cache Creek, Nemo and the St. Francis River, Lake 

 City, Ark. and "Missouri." 



