ANCULOSA. 421 



which is a dirtj' dark greeu, is but poorly relieved by the faint bauds 

 on the whorl ; nevertheless it is an interesting species, and one 

 which will always attract attention; its most prominent character 

 is the constriction on the bod3'-whorl, which gives the appeai'ance 

 of a cord beiug drawn tightly around it while in a yielding state. — 

 Anthony. 



This species does not resemble very closely the shell de- 

 scribed by Mr. Lea as Anculosa Coosaensis, although that 

 species possesses (in a less marked degree) the peculiar strict- 

 ure of the body-whorl. Ligata differs in texture and color, 

 and generally possesses three bands only, and none of the nu- 

 merous specimens I have seen are maculate. Coosaensis ap- 

 pears to grow larger and heavier, and is more slender in its 

 proportions, although swelling out more towards the periphery. 



Doubtful and Spueious Species. 



A. {Paludina) nuclea, Lea, = Amnicola. 



A. (.Paludina) virens. Lea, = Amnicola. 



A. Spixiana, Lea, Keeve and BuoT, = Angitrema. 



A. incisa, Lea, Haldeman, Mouog., = Schizostoma. 



A. cingenda, Anthony, MSS., = youug of carinaia, Lea, a variety of dissImiHg. 



A. planidata, Lea, "Wheatley, Cat. Shells, p. 28, Alabama (desc. not published), 



= ampla, Anthony ? 

 IMel. carinata, Ravenee, Cat., p. 11, Yadkin River, N. C. 

 IMel. costata, Ravenel, Cat., p. II, Dau River, Va., =; dissimilis'! 

 lA. subcarinata, Ravenel, Cat., p. 11, Susquehanna, — dissimilisJ 

 A. Integra, Sat, = Somatogyra. 

 A. suhglnbosa, SAY, ^^ Somatogyra. 

 A. {Paludini) altilis, LEA, := Somatogyra. 

 Paludina altilis, Ravenel, = Somatogyra. 

 Paludina humerosa, Anthony, Proc. Acad. Nat. Sci., p. 71, 1860, 



