324 NEW YORK STATE MUSEUM 



use of the name, though somewhat vaguely. In 1879 Hall + in rede- 

 scribing Bell, natator abandoned the term Phragmostoma evidently in 

 favor of the Siluric species which he originally called Carinaropsis. E. O. 

 Ulrich in the Paleontology of Minnesota, 1897, v. 3, p. 854, emends Waagen's 

 Patellostium to include what that author intended by the two terms Patel- 

 lostium and Phragmostoma and suggests that a number of American species 

 pertain thereto, among others Bell, patulus Hall (Hamilton) and B. 

 natator. In a paper submittted for publication in 1892 but not published 

 till 1900, 2 the writer pointed out the differences in the structure of Patellos- 

 tium and Bell, patulus, both seamless shells with expanded peristomes 

 in the former entire, in the latter broadly emarginate on the outside and 

 transected by a granulose callus on the inner lip. The latter also has con- 

 centric but no revolving surface lines and narrowly umbilicated whorls. It 

 was there proposed to designate species of the type of B. patulus by the 

 term Ptomatis, of which one species from the Erere sandstone (P. f o r b e s i ) 

 was described. 



In a recent paper 3 Drevermann has described a species as Bell. 

 (Phragmostoma) rhenanus which bears an explanate body whorl 

 with an emarginate outer lip, and fine revolving striae cancelated by con- 

 centric lines, but without any thickening of the inner lip or any transverse 

 septum. It is hence not a Phragmostoma. The species is compared by 

 the author with B. patulus Hall, with which it seems to agree in all 

 essentials, B. patulus however bearing no revolving striae. 4 The author 



'Pal. N. Y. v. 5, pt 2, p. 108. 



3 The Palaeozoic Fauna of Para, Brazil: Archivos do Mus. Nac. do Rio de Janeiro, 

 10: 75 (author's reprint, p. 41). 



3 Die Fauna der Untercoblenzschichten von Oberstadtfelt bei Daun in der Eifel. 

 1902. [Paleontographica, 49: 76] 



4 Two illustrations of the same specimen of B. patulus given in Pal. N. Y. v. 5, pt 

 2, pi. 22, fig. 20; pi. 26, fig. 12, are misleading in this respect. The specimen has been 

 laterally compressed, and as a result the surface longitudinally wrinkled. Normally the 

 spe< ies shows no revolving lines, while the transverse lines take the form of broad unin- 

 terrupted festoons. 



