448 PROCEEDINGS OF THE ACADEMY OF [1900. 



Prof. M. R. Gaines and others, I conclude that C. nipponensis is 

 hardly tenable as a variety. The gibbous penultimate and slender 

 last whorl occur sporadically among typical japonica. The size 

 varies a good deal in C. japonica, but the above -described variety 

 presents a peculiar and quite recognizable contour. 



EXPLANATION OF PLATE XIV. 



Figs. 1-3. Clausilia hakonensis n. sp. Fig. 2, natural size. 



Fig. 4. Clausilia japonica var. surugce n. var., natural size. 



Figs. 5-7. Clausilia subaurantiaca n. sp. 



Figs. 8-11. Clausilia Hirasei n. sp. Fig. 10, diagrammatic. 

 /., lunella; Lf., fulcrum or lamella fulcrans ; l.i., 

 inferior lamella; l.p., parallel lamella; l.s., superior 

 lamella; l.sp., spiral lamella; p.p., principal plica; 

 p.s., sutural plicae; u.p.p., upper palatal plica. 



Figs. 12-14. Clausilia hyper optyx n. sp. 



Figs. 15-17. Clausilia awajiensis n. sp. 



Figs. 18-20. Clausilia aulacophora n. sp. 



