306 PROCEEDINGS OF THE ACADEMY OF [1889. 



Sphaerodoma medialis (Meek and Worthen). 



Macrochilus mediate Meek and Worthen, 1860. Proc. Acad, Nat. 

 Sci. Phila., p. 466 ; M. mediate M. and W., 1866. Geol. Sur. Illinois, 

 vol. II, p. 270; Soleniscus medialis White, 1884. Geol. Indiana, 

 13th Ann. Rept., pt. ii, p. 156 ; 31. pulchellum M. and W., 1860. 

 Proc. Acad. Nat. Sci.. Phila., p. 467; M. intercalate M. and W., 

 1860, Proc. Acad. Nat. Sci. Phila., p. 467 ; M. intercalare M. and 

 W., 1866, Geol. Sur. 111., vol. II, p. 371. Upper Coal Measures. 



Sphaerodoma pinguis (Winchell). 



Macrochilus pingue Winchell, 1863. Proc. Acad. Nat. Sci. Phila., 

 p. 21. Kinderhook beds. 



Sphaerodoma ponderosa (Swallow). 



Macrochilus ponder oswn Swallow, 1858. Trans. St. Louis Acad. 

 Sci., vol. I, p. 202; Soleniscus t ponderosus White, 1884. Geol. 

 Indiana, 13th Ann. Report., pt. ii, p. 156. Upper Coal Measures. 



Sphaerodoma primogenia (Conrad). 



Stylifer primogenia Conrad, 1835. Trans. Geol. Soc. Penn., vol. 

 I, p. 267 ; Macrochilus primogenium Hall, 1858. Geol. Iowa, vol. 

 I, p. 720 ; Soleniscus primogenius White, 1884. Geol. Indiana, 13th 

 Ann. Rept., pt. ii, p. 157; Fusus inhabilis Morton, 1836, Am. 

 Jour. Sci., vol. XXIX, p. 160. Lower Coal Measures. 



Sphaerodoma'? prisca (Whitfield). 



Macrochilus priscum Whitfield, 1882. Annals N. Y. Acad. Sci., 

 vol. II, p. 204. Upper Helderberg. 



Sphaerodoma subcorpulenta (Whitfield). 



Macrochilus subcorpulentum Whitfield, 1 882. Annals N. Y. Acad. 

 Sci., vol. II, p. 224. Kaskaskia limestone. This form is perhaps 

 identical with S. cooperensis of Swallow. 



Sphaerodoma texana (Shumard). 



Macrochilus texanum Shumard, 1859. Trans. St. Louis Acad. 

 Sci., vol. I, p. 402 ; Soleniscus texanus White, 1884. Geol. Indiana, 

 13th Ann. Rept., pt. ii, p. 157. Coal Measures. 



The various terms proposed at different times for members of the 

 group defined by Phillips have been fully considered elsewhere. It 

 is only necessary to repeat here the synonymy : 



Buccinum Sowerby and others (In part) [Non Linne]. 



Buccinites Schlotheim, 1820. Petrefactenkunde, p. 127 (in part). 



Macrochilus Phillips, 1841. Palse. Foss., p. 103 (non Hope, 1838, 

 Coleoptera). 



Plectostytus Conrad, 1842. Jour. Acad. Nat. Sci. Phila., vol. 

 VIII, p. 275. (Non Beck, 1837.) 



Soleniscus Meek and Worthen, 1860. Proc. Acad. Nat. Sci. 

 Phila., p. 467. 





