56 LAND AND FIIESII- 'WATER SHELLS OF N. A, [PART III 



Ijioplax cyclostoBsaatifos'Jlllis, Lea. — Shell siibcylindrical, 

 rather thick, pale horn color, smooth, imperforate ; spire exserted, at the 

 apex rose colored and obtuse ; sutures very much impressed ; whirls five, 

 rounded ; aperture small, nearly round, within salmon colored. 



Coosa River, Alabama. Dr. Brumby. My cabinet, and 

 Fig. 114. cabinets of Dr. Griffith, Dr. Jay, L. W. Sloat, and Dr. Fore- 

 man. Diam. .32, length .82 of an inch. 



This is a very remarkable jpecies, assuming very much 

 the form of an exserted Cydostoiaa. A single, somewhat 

 worn specimen only, was received. The aperture is rather 

 more than one-third the length of the shell. Its subcyliu- 

 drical form is very remarkable. 

 Lioplax ci/clos- Since the above description was written, Dr. Jay and Dr. 

 tomati/ormis. Foreman have placed in my hands specimens from the same 

 locality. The epidermis is perfect, and they are of a green- 

 ish horn color. The interior of the aperture is bluish, while the apex is 

 slightly salmon colored. {Lea.) 



Paludina cyclostomati/ormis, Lea, Tr. Am. Phil. See. IX, pt. i, p. 23 

 (1S44); Obs. IV, 23; Proc. II, 83, (1841).— Reeve, Con. Icon. 43 

 (Feb. 1863). 



Paludina contorUi, Shuttlewokth, of Kustek in Chemu. ed. 2, p. 20, pi. 

 iv, f. 7-9 (1852). 



Paludina elliotti, Lea, Proc. Acad. Nat. Sc. Phila. 1858, p. 166. 



The specific name of this s])ecies must not be confounded with 

 that of Pal. cyclostomseformis of D'Orbigny (Mac^. de Zool. 

 1837, cl. V, pi. ixxix, f. 1) 



The outline of the back of the shell reminds one of the Cuban 

 Ilegalomastoma.. The three upper whirls are sometimes of a 

 very light flesh color, contrasting with the dark green of the 

 remainder. The peristome is sometimes continuous, being ap- 

 pressed to the body whirl, and forming a rimate umbilicus. On 

 some specimens I have detected minute revolving lines. 



Pal. elliotti is a finer, better developed form of the species than 

 that described as cyclostomatiformis, and has more acutely cari- 

 nated upper whirls. A careful examination of Mr. Lea's types 

 leads me to consider them identical. With his original description 

 of the latter I have given Fig. 114 from his type, while below will 

 be found the description of Pal. elliotti and a figure (115) of a 

 specimen presented me under this name by Mr. Lea and now in 

 the Smithsonian collection (No. 9015). 



I have ))lneod Paludina eontorta in the synonymy of this species 

 after a careful examiuation of a specimen received by Mr. Bland 



