337 



part of this volume, as a " natural mould of the exterior of the shell ", etc., 

 would be more correctly described as a well preserved hollow, testiferous 

 specimen, that has been broken longitudinally in such a way as to expose 

 the concave inner surface of about one half of each of the five volutions. 

 Its characters are clearly indicative of a new generic type, which there is 

 not sufficient material to define satisfactorily. 



Edomphalus Galtensis, Whiteave?. 



EuoMPHALUS INORNATUS, Whiteaves. 



EuoMPHALUs ciRCiNATUS, Whiteaves. 



Straparollus Hippolyte, Billings. 



Straparollina Daphne, Billings. 



PoLEUMiTA, Clarke and Ruedemann. 



EuomphcUus (pars) Sowprby 1814. Min. Conch., vol. I, p. 97 ; et auot. 



Polytropis, DeKoninck 1881. Faun. Carbonif,, vol. II, pi. 3, p. 107. 



But not Polytropis, Sandberger, 1874. 

 Oriostoma (pars) Lindstrom 1884. Silur. Gastrop. and Pterop. Gotland, p. 



156. But apparently not Oriostoma, Munier 



Chalmaa,1876. Journ.Conch.,vol. XVI, p. 103. 

 Omphalotrochus, Lindstrom 1884. Op. cit., p. 156. But not Omphaiotroehus, 



Meek, as now understood. 



Boriostorna, Fischer 1885. Manuel de Conchyliologie, etc., p. 813. 



Omphalotrochus, 'Ea.atma.n 1900. Text-book Palaeont, vol. I, p. 447. Not 



Omphalotrochus, Meek. 1864. 

 Polenmita,^C\a,Tke and Ruedemann . . . 1903. N. York St. Mus., Mem. 5, p. 59. 

 Polytropina, Donald (Miss Jane) 1905. Quart. .Toum. Geol. Soc. London, vol. 



LXI, p. 575. 



POLEUMITA SULCATA (Hall). 



Cyclonema sulcata. Hall 1852. Pal. N.York, vol. II, p. 347, pi. 34, 



figs. 1, a-d. 



„ V Billings 1863. Geol. Canada, p. 343, figs. 350, a, b. 



Cyclonf.ma sulcatum, Whiteaves 1884. This volume, pt. I, p. 18, pi. 3, fig. 5. 



Poij/iropis SM//ca«MS, Whiteaves 1895. Idem, pt. II, p. 89, pi. 13, figs. 9 



and 9 a. 

 Po'eumito ('.?^ suicato, Clarke and Ruedemann. . 1903. N. York St. Mus., Mem. 5, p. 



62, pi. 10, figs. 1-4. 



As stated on page 259, this species still seems to the writer to be con- 

 generic with the Cyclonema carinaium of Lindstrom (the Turbo cari- 

 natus of Sowerby) which Ulrich says is a Gyronema. Ulrich, however, 

 who is the founder of the genus Gyronema, is not of that opinion, and in 

 a letter dated April 13, 1906, writes as follows on this point. "P. sul- 

 cata is a Poleumita and not a Gyronema because of its subcircular mouth 

 the association of opercula with it, the greater directness with which the 

 lines of growth cross the under side of the volutions and the fact that the 



