3() Hill — J*al(oiil()l()(/i/ (if Ike 7)-liiifij Division. 



Tliu smallest and largest rorins arc void of the handsome ro\v.s 

 of tubercides which disthiguish the specimens of medium size. 

 The larger adult specimens sometimes attain a length of two 

 inches. 



This form is of interest because it is the characteristic species 

 of the Wealden (Lower Neocomian) beds of Europe. It may 

 be the same as Melania stromhiformis, first described from the 

 Wealden strata of North Germany by Schlotheim. 



De Verneuil and l)e Loriere, in 1886, published most excel- 

 lent figures and descriptions in their paper upon Materieu.N: pour 

 le Paleontologie de TEspagne, entitled " Description des Fossiles 

 du Neocomien Superieur de Utrillas et ses Environs," Paris, 

 1868. They review the literature of the si)ccies and refer it to 

 the Vicarya, a suljgenus of CerUludie. The}^ make four distinct 

 species of their specimens, which I believe to be variations of 

 the same species, all of which except one occur in intimate asso- 

 ciation in the lower Glen Rose beds. 



Professor Jules Marcou, in the })reviously mentioned review 

 of my Arkansas species, asserts that the form is a Neriiucd, but 

 the forms are absolutely void of the characteristic folds which 

 occur u];)on the columella of that genus, and hence he is mis- 

 taken. 



The form occurs in great aljundance at the gy])sum l)luii's of 

 the Little Missouri, in Arkansas. At the plant bed locality near 

 Glen Rose, Texas, it is still more abundant and shows the variety 

 helvetica and lajani preserved together in great masses. At Post 

 ]\Iountain, near Burnet, Texas, the badly Avorn shells of this 

 species occur in an agglomeration ten feet thick (i)late v, fig. 

 7), void of other species and embedded in a matrix of the min- 

 eral grahamite. In this mass all the varieties can be found in 

 association. 



Neiinasa austinensis lioeuier. 



Roemer. Paleont. Abhandl., vol. iv, p. 295, plate 31. fig. 8. 



Fragments resembling this S[)ecies are aljundant in the up])er 

 or Mount lionnel beds of the Glen Rose l)eds, l)ut are so poorly 

 preserved as to render their assignment to it only provisional. 

 I have found them in the Strontionite beds of the Colorado sec- 

 tion, and a stratum of the beds near the sunnnit of Mount Ron- 

 nel consists almost entirely of calcified Xeriaeas. In outer 



