98 (Jincinno.ti Society of Natural History. 



"Inhabits South Carolina. Cabinet of the Academy. Presented 

 to the Academy by Mr. L'Herminier, of Charleston, an intelligent 

 and zealous naturalist. He assured me that this species inhabits 

 near Charleston. It somewhat resembles large specimens of the P. 

 trivolvis, of the American edition of Nicholson's Encyc. but differs 

 in the total absence of carina, and in having a more smooth and 

 polished surface, as well as a declining and more oblique aperture, 

 and a more profound and much more regularly concave umbilicus." 



Halderaan, in his Monograph of Planorbis, pp. 11 and 12, quotes 

 Say's description and sa3-s: "My shells do not agree perfectly with 

 Say's description copied above; 3'et the}^ most probably constitute 

 the species he had in view. The}' differ from P. trivolvis by having 

 a much more oblique peritreme, the whorls more nearly cylindrical, 

 the diameter increasing less rapidly, and without any tendency^ to 

 carination upon the left side." 



Mr. Binney, in Land and Fresh Water Shells, part ii., p. 106, 

 quotes Say's description and adds: "My figure of P. glabratus is 

 drawn from a specimen corresponding with that figured by Kalde- 

 man, and generally acknowledged to be this species." 



It would seem, from the language used both by Haldeman and 

 Binney, that they had never seen Mr. Say's type of this species. 

 As they would undoubtedly have availed themselves of every means 

 accessible, and as the collection of the Academy was at all times 

 open to them, the presumption is that Mr. Say's type is lost. 



It is needless for me to say to those who liave given close attention 

 to this species, that the shells known as P. glabratus in collections, do 

 not agree with Mr. Sa_y's description in many particulars. The}' do 

 not have five whorls; they are carinated; they are not glabrous or 

 polished; they ai'e transversely roughened by lines of growth; the um- 

 bilicus does not exhibit all the volutions. It is to be remembered that 

 Mr. Say's description is founded upon the idea that the shell is 

 sinistral, an opinion which I hold notwithstanding it is contrary to the 

 general belief of our leading conchologists. I have in my collections 

 specimens labeled P. glabratus, by one of the most competent of North 

 American conchologists, that show but a fraction over three whorls; 

 that exhibit, in no case, all the umbilical volutions; that are carinated; 

 that are not polished but roughened by lines of growth. These can not 

 be Mr. Say's shell, nor have I yet been able to obtain a specimen from 

 my exchanges that would meet the requirements of the case. 



In 1875 a large collection of shells, from the iMiami country of 

 Florida, came into my hands, among which was the true Planorbis 



