TIIK NAUTILUS. 69 



surface exhibiting very coarse and irregular growth striae. Color 

 yellow, plain or marked with irregular black lineations, apex black. 

 Whorls 6, convex; suture well impressed. Aperture a little oblique, 

 sub-rotund, yellowish within. Peristome simple, very thin. Colum- 

 ella white, biplicate, not prominent. 



Length 10; diam. 7 mm. 



Habitat, Wailuku valley, West Maui. 



This species is remarkable for the very coarse and irregular growth 

 strias exhibited on its surface. 



Cotypes of these species deposited in the Acad. Nat. Sci. Phila. 

 will be figured in the next volume of the Manual of Conchology. 



THE MIOCENE SPECIES OF LYMNAEA. 



BY T. D. A. COCKERELL. 



In Bull. Am. Mus. Nat. Hist., Dec., 1906, I described two small 

 species of Lymnaa from the miocene beds of Florissant. In 1907, 

 at station 1, I found a much larger species, unfortunately not in the 

 best state of preservation. 1 hoped to find more material in 1908, 

 but as none was obtained, a description from the original type is now 

 offered. 



Lymncea florissantica, n. sp. 



Length 21 mm.; diameter about 10^; spire short, scarcely over 5 

 mm. long, the whorls moderately convex ; body-whorl not very con- 

 vex, with coarse, shallow, vertical grooves. In Baker's key in his 

 Mollusca of the Chicago Area, it runs nearest to L. palustris, but it 

 is not at all like that species. It is in reality a miocene representa- 

 tive of L. emarginata. In Mr. O. O. Nylander's series of figures of 

 L. emarginata (published by the author in a pamphlet, 1901), 

 it closely resembles PI. 1, f. 7, except that it is distinctly more 

 slender, and the base is narrower, about as in fig. 8, though the rest 

 of the shell is not at all like fig. 8. 



The following table separates the miocene species of Lymncea. 



Spire short and rather obtuse, 

 body-whorl large 1 . 



