212 GASTEROPODS. 



Soleniscus brevis (WHITE). 



Macrochilus ventricosum Hall, 1858: Geology Iowa, vol. I, p. 718. (Pre- 

 occupied by Goldfuss.) 



Soleniscus brevis White 1881 : Expl. and Sur. w. 100 Merid., Supp. to vol. 

 Ill, p. xxviii. 



Soleniscus brevis Keyes, 1889 : Am. Naturalist, vol. XXtll, p . 323. 



Soleniscus brevis Keyes, 1889: Proc. Acad. Nat. Sci., Phila., p. 307. 



Shell small, thin, with the spire acute, and occupying about 

 one-third the entire length ; volutions about seven in number* 

 rather strongly convex, the last moderately ventricose ; suture 

 impressed, but not deeply ; columellar ridge well-defined . Sur- 

 face polished, with a few obscure lines of growth. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City, Clinton ( Henry county ). 



The form originally described, from the lower Coal Measures 

 of Iowa, by Hall, as Macrochilus ventricosum, is a thin, rather 

 delicate shell, having but little resemblance to the specimens 

 usually passing under this name, which are, almost without 

 exception, young individuals of larger and heavier species. 

 It is not at all probable that HalPs form and Soleniscus brevis, 

 described from New Mexico, are identical, as has been thought 

 lately by White. In case, however, that they do prove to be 

 the same, White's name has precedence over HalPs title, inas- 

 much as the latter term had long been preoccupied. Until, 

 then, typical examples of each form can be carefully compared, 

 it does not seem advisable to propose a new name for the form 

 known as M. ventricosum. Besides, Cox has described a very 

 similar shell from Kentucky, which has also been recognized 

 in the Des Moines valley, near the place where HalPs species 

 was originally found ; so that it is possible that this term will 

 have priority over all others for the form now under considera- 

 tion. 



Soleniscus newberryi (STEVENS). 



Loxonema newberryi Stevens, 1858: Am. Jour. Sci., (2), vol. XXV, p. 259. 

 Macrochilus newberryi Hall, 1858 : Geol. Iowa, vol. I, p. 719, pi. xxix, fig. 1. 

 Soleniscus planus White, 1881: Expl. and Sur. w. 100 Merid., Supp. ta 



vol. Ill, p. xxix, pi. iv, fig. 4. 

 Macrochilina newberryi de Konnick, 1881 : Ann. de Mus. Roy. d'Hist. Nat. 



dela Belgique, t. VI, p. 36. 



