346 NEW MELANID2E OF THE UNITED STATES. 



Mr. Lovell Reeve, in his beautiful " Conchologia Ieonica," has recently issued among 

 his monographs one of the genus Io with numerous plates and full descriptions. In 

 this he has'introduced a number of species, most of which I think more appropriately 

 belong to Prof. Haldeman's genus Liihasia — the species of which form a very excellent 

 group, which he separated from Melania and Anculosa — but which Mr. Reeve does 

 not seem to recognise. Of the true Io I also think he has considered several varieties 

 as species. 



Io nouosa. PL 39, fig. 212. 



Testa, tubereulata, elevato-conica, virido-cornea, vittata ; spira regularity eonica, ; suturis valde im- 

 pressis ; anfractibus instar denis, platiulatis, medio tuberculatis, infra, striatis ; apertura. parviuscula, 

 rhomboidea, intiis' vittata, ; labro aeuto et sigmoideo ; columella alba et valde contorts, ; canale 

 breviuscula,. 



Shell tuberculate, raised, conical, greenish horn-color, banded; spire irregularly 

 conical ; sutures very much impressed ; whorls about ten, flattened, tuberculate on 

 the middle, striate below ; aperture rather small, rhomboidal, banded within ; outer 

 lip sharp and sigmoid ; columella white and very much twisted ; canal rather short. 



Operculum piriform, spiral, dark chestnut-brown, with the polar point near to the 



basal margin. 



Proc. Acad. Nat. Sci., 1861, p. 898. 



flab. — Tennessee River, Alabama?* Wm. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. -57, Length 1-58 inch. 



Remarlcs. — This is one of those species of Melaniclce which we have considered to be- 

 long to the group, with a regular channel at the base, like the genus Fusus, but which 

 really belongs to the genus Io, having other characters differing from Melania. It is 

 nearly allied to the species which I described as Melania nobilis, f in the Trans. Am. 

 Phil. Soc, vol x. pi. 9, fig. 48, from a single imperfect specimen. It is a smaller 

 species, and is not so fusiform, having a shorter channel, which is not quite so much 

 twisted, and the nodules are not so large. The aperture is more than one-third the 

 length of the shell. 



*B' 



Io robusta. PL 39, fig. 213. 



Testa, canaliculata, parum tubereulata, elevato-conica, pallido-cornea, infra, obsolete vittata; spira regu- 

 lariter eonica ; suturis valde impressis ; anfractibus instar denis, apud apiceni planulatis, infra cana- 

 liculata ; apertura parviuscula, rliomboidea, intiis vittata ; labro aeuto et sigmoideo ; columella pallido 

 salmonea ; eanale breviuscula. 



*Dr. Spillman simply gave Tennessee Elver as the habitat of these species, but did not mention what part. 

 It is probably from Alabama. 



t In transferring this to the genus Io, I think it may properly be considered the type of a group of the genus. 



