1889.] NATURAL SCIENCES OF PHILADELPHIA. 307 



Duncania Boyle, 1879. Jour, de Conchyliologie (3), vol. XIX, 

 p. 35. (Proposed for Phillips' genus.) 



Macrochilia Boyle, 1880. Ibid., vol. XX, p. 241. 

 Soleniscus embraces the following American forms: 



Soleniscus acutus (Sowerby). 



Reported, but probably not American. 



Soleniscus altonensis (Worthen). 



Macrochilus altonense, Worthen, 1873. Geol. Sur. Illinois, vol. 

 V, p. 593 ; S. altonensis Keyes, 1889. Am. Naturalist, vol. XXIII. 

 p. 423. Lower Coal Measures. 



Soleniscus 1 1 anguliferus (White). 



Macrochilus anguliferum White, 1874. Prelim. Rept. Expl. and 

 Sur., W. 100 Merid., p. 22. Coal Measures. Probably does not 

 belong to this group. 



Soleniscus brevis (White). 



8. brevis White, 1881. Expl. and Sur., W. 100 Merid., Supp. 

 vol. Ill, p. XXVIII ; Macrochilus ventricosum Hall, 1858. Geol. 

 Iowa, vol. I, p. 718 [preoccupied by Goldfuss] ; S. ventricosus White, 

 1884. Geol. Indiana, 13th Ann. Report., pt. ii, p. 155. S. brevis 

 Keyes, 1889. Am. Naturalist, vol. XXIII, p. 423. Coal Measures. 

 It is quite evident that the young shells of several other species have 

 been repeatedly mistaken for this species. 



Soleniscus carinatus (Stevens). 



Loxonema carinatum Stevens, 1858. Am. Jour. Sci. (2), vol. 

 XXV, p. 259 ; Macrochilus carinatum Miller, 1877. Cat. Am. 

 Pake. Foss., p. 151 ; S. carinatus Keyes, 1889. Am. Xaturalist, vol. 

 XXIII, p. 423. Lower Coal Measures. 



Soleniscus? attenuatus (Hall). 



Macrochilus fusiforme Hall, 1858. Geol. Iowa, vol. I, pt. ii, p. 

 718; Loxonema nitidulum'l Meek and Worthen, 1860. Proc. 

 Phila., Acad. Nat. Sci., p. 465 ; Pulyphemopsis nitidula f t M. and 

 W., 1866. Geol. Illinois, vol. II, p. 374 ; Macrochilus attenuatum 

 Hall, 1877. Miller's Cat. Am. Palte. Foss., p. 244 [M. fusiforme 

 was preoccupied] ; Polyphemopsis fusiformis White, 1880. Geol. 

 Indiana, p. 519 ; Soleniscus fusiformis White, 1884. Geol. Indiana, 

 13th Ann. Rep., pt. 11, p. 154. S. ? attenuatus Keyes, 1889. Am. 

 Naturalist, vol. XXIII, p. 423. Lower Coal Measures. 



Soleniscus gracilis (Cox). 



Macrochilus gracile Cox, 1857. Geol. Sur. Kentucky, vol. Ill, 

 p. 570; M. gracile Keyes, 1888. Proc. Acad. Nat, Sci. Phila., p. 

 239. S. gracilis Keyes, 1889, Am. Naturalist, vol. XXIII, p. 423. 

 Lower Coal Measures. 



