1904.] NATURAL SCIENCES OF PHILADELPHIA. 837 



Clausilia cladoptyx n. sp. PI. LVII, figs. 111-115. 



Shell cylindric below, the upper half regularly tapering; amber or 

 brownish-amber colored; almost entirely smooth, with a varnish-like 

 gloss. Whorls 9, quite convex. Aperture ovate; peristome reflexed, 

 slightly thickened. Superior lamella small, vertical, marginal, con- 

 tiguous to or continuous with the spiral lamella, which penetrates 

 nearly to the ventral side. Inferior lamella more or less receding, 

 forming a very strong fold in the throat, ascending in a very broad 

 sigmoid plate, abruptly diminishing to a small thread above, which 

 revolves parallel to the spiral lamella, but does not penetrate so deeply. 

 Subcolumellar lamella emerging to the lip-edge ; inside it dilates, rising 

 in an angle in a lateral position. Outside of the spiral lamella there are 

 two short equal, parallel lamellae {lamella fulcrans and I. parallela). 

 The principal plica is dorsal and lateral, visible in the throat, and nearly 

 a half whorl long; below it there is a very long upper palatal plica, 

 which at its inner end gives out a very short oblique branch downward, 

 the lunella. Below this there is a short palatal plica, at least in some 

 specimens. Above the principal plica there are two sutural plicse, 

 the lower one well developed, the upper small. 



Length 10, diam. 2.2 mm. 



Length 9, diam. 2 mm. 



The clausilium (PI. LVII, figs. Ill, 112) is short and wide, parallel- 

 sided ; there is a deep semicircular notch near the apex on the palatal 

 side, and a deep excision on the columellar side of the filament. A 

 marginal rib runs along the columellar side from the excision to the 

 notch. 



Tokunoshima, at Teteyama, near Sanmura. Types No. 87,592, 

 A. N. S. P., from No. 1,204a of Mr. Hirase's collection. 



Specimens from Sanmura, Tokunoshima, differ from typical C. 

 cladoptyx in the smaller size: length 9, diam. 2 mm. to length 7.5, 

 diam. 1.8 mm. 



The plicse are visible from the outside through the shell, as in Oligo- 

 zaptyx. 



EuPHiEDUSOID PHYLUM. 



Section EUPH.EDUSA Bttg. 

 Clausilia tryoni var. miyakejimana subsp. nov. 



This race differs from C. tryoni in having two or three small, short 

 palatal plicae below the upper one. The striation of the last whorl is 

 also denser and finer. 



Miyakejima, Izu. Types No. 86,464, A. N. S. P., from No. 1,068 

 of Mr. Hirase's collection. 



