1903.] NATURAL SCIENCES OF PHILADELPHIA. 317 



last somewhat compressed, very shortly projecting in front. Aper- 

 ture slightly oblique, the peristome continuous, narrowly reflexed, but 

 little thickened. Superior lamella marginal, thin and compressed, 

 separated from the spiral lamella, which extends inward to the middle 

 of the front side. Inferior lamella deeply receding, thin and straightly 

 ascending within, penetrating deeper than the spiral lamella. Sub- 

 columellar lamella deeply immersed. Principal plica hardly a third 

 of a whorl long, latero-dorsal. Upper palatal plica short and low, a 

 low, short, nearly straight lunella connected with it. 



Length 9.5, diam. 2 mm. 



Length 8.5, diam. 1.8 mm. 



Clausilium long and narrow, rounded distally, excavated on the 

 columellar side of the filament. It is very similar to that of C. cenea, 

 but tapers less distally (figs. 17, 18). 



Shimohanyama, Tosa, Shikoku Island. Types No. 84,438, A. N. 

 S. P., from No. 1,013 of Mr. Hirase's collection. 



This small, thin, rib-striate species seems by its palatal armature to 

 ba related somewhat to C. micropeas, but in all other respects it re- 

 sembles the slightly larger C. cenea which was found with it. Both 

 may be more nearly related to C. tosana than to other described species. 

 The lunella in C. aratorum is very weak except close to the upper palatal 

 plica, where it becomes stronger; and in some shells only this stronger 

 portion is present, making with the plica an irregularly triangular 

 callous, without the extension downward shown in the figure. I can 

 see no trace of a lower palatal plica. The subcolumellar lamella has 

 no spiral extension within, on the ventral side of the penult, whorl 

 parallel to the spiral and inferior lamellae, in either this species or C. 

 ce.nea. 

 Clausilia aenea n. sp. PI. XIV, figs. 11, 12, 13, 14. 



Shell slender, fusiform, brown with a bronzed luster, the surface 

 closely, strongly striate. Whorls 9J, convex, the last somewhat com- 

 pressed laterally. Aperture slightly oblique, piriform, the peristome 

 thin, free, expanded and slightly reflexed, somewhat emarginate above. 

 Superior lamella thin, compressed, vertical, almost separated from the 

 spiral lamella, which penetrates to the middle of the ventral side. 

 Inferior lamella deeply receding, thin and straightly ascending within, 

 as long as the spiral lamella. Subcolumellar lamella deeply immersed. 

 Principal plica short, dorso-lateral. Upper and lower palatal plicae 

 short, parallel, connected by a low ridge upon which there are three 

 low tubercles. 



Length 12.5, diam. 2.5 mm. 



Length 11, diam. 2.3 mm. 



