678 PROCEEDINGS OF THE ACADEMY OF [1900. 



spiral within, not emerging upon the lip. Subcolumellar lamella 

 emerging, nearly or quite attaining the margin. Principal plicae 

 rather long; palatal plicae seven or fewer, the upper two curved, 

 diverging forward from the principal, longer than the others 

 except the lower one. Clausilium strongly curved, short, broader 

 and thickened distally, emarginate posteriorly on the columellar 

 margin (PI. XXV, figs. 42, 43, 44). 



Alt. 21, diam. 4.5, longest axis of aperture 4.6 mm. 



Alt. 18, diam. 4, longest axis of aperture 4 mm. 



Boshiu; Suruga coast (F. Stearns). 



This species stands between C. oostoma and C. brevior in size, 

 and has the slender apical whorls and therefore concave-sided spire 

 of the latter, which differs in being more obese with a different- 

 shaped aperture. It is probably nearest to C. nikkoensis Mlldff. , 

 but that species, from the description, must be even more slender 

 and with the inferior lamella reaching the margin of the peristome, 

 which is not at all the case in C. hondana. Were it not for this 

 differential feature I would not distinguish my shells from Dr. 

 von Moellendorff's species. The clausilium is much like that of 

 C. brevior. 



Of five specimens opened, no two quite agree in the palatal 

 folds, and some are so different that one could scarcely believe 

 them variations of one species were not all the other characters, 

 including the clausilium, quite identical in the series. The follow- 

 ing variations occurred: 



(a) Palatal plicae seven, as above described (figs. 13-15). 



(6) Palatal plicae three, two above, one below, the third, fourth, 

 fifth and sixth wanting (fig. 18). 



(c) Palatal plicae four, the lower and two upper undiminished, 

 the third small, a foldless space below it (fig. 17). 



(d) Palatal plicae three, a very low but distinct, straight lunella 

 running from the second to the lower plica (fig. 16). 



These variations seem enough to make several species of, but I 

 feel confident that they belong to one species. Specimens a and 

 b are from Boshiu, c and d from Suruga. 

 Clausilia subjaponica n. sp. 



General appearance of C. japonica Crosse. Whorls 12 to 13-J, 

 the apex very obtuse, not tapering as in japonica, and the attenu- 

 ated portion of the spire is thicker. Aperture with thickened, re- 



