374 PROCEEDINGS OF THE ACADEMY OF [May, 



Length 13.5, diam. 3 mm. 



Length 12.5, diam. 2.7 mm. 



Length 12, diam. 3 mm. 



Clausilium (PI. XVII, figs. 13, 14) rather narrow and parallel - 

 sided, very strongly curved, pinched into a channel or spout at the 

 apex, abruptly and deeply emarginate on the columellar side of the 

 filament. 



Hirado, Hizen, in western Kyushu. Types No. 82,980, A. N. 

 S. P., from No. 7336 of Mr. Hirase's collection. 



There is some variation in the degree of apical attenuation and 

 in the emphasis of the subcolumellar lamella. Fig. 16 represents 

 the type. Some specimens, as that drawn in fig. 12, are more 

 swollen. The shell resembles species of the group of C. awajiensis 

 in most of its characters, except for the nodule -like lower palatal 

 plica, but it is very distinct in the specialization of the clausilium, 

 which is channeled apically, much as in C. crenilabium, the channel 

 apparently fitting over the lower palatal plica. 



Section TYRANNOPH^EDUSA Pilsbry. 

 Group of C. mikado. 



The forms described and illustrated below complete the illustra- 

 tion and description of the species and varieties now known of this 

 section. 

 Clausilia aurantiaca Boettger. PI. XX, figs. 50, 51, 52, 53, 54. 



Boettger, Clausilienstudien, p. 68 (1877); Syst. Verz., p. 57 (1878); 



Jahrb. d. D. Malak. Ges., V, p. 101, PL 4, fig. 5, 

 Kobelt, Fauna Moll. Extramar. Jap., p. 95, PL 9, fig. 11 (1879). 



This species was described from the ' ' interior of Nippon ' ' from 

 specimens collected by Rein. Probably the types came from some 

 province near the eastern end of the Inland Sea. 



The shell is very solid for its size, fusiform, moderately attenu- 

 ated above, the early whorls quite small. The sub ventral lunella is 

 straight, connecting the two palatal plicse like the letter I, but it is 

 usually placed obliquely, crossing the line of the external striae. 

 The superior lamella is continuous with the spiral lamella, which 

 penetrates inward across the ventral side to a point further inward 

 than above the sinulus. The inferior lamella is equally long. The 

 subcolumellar lamella typically emerges to the lip-edge. The shell 

 usually is more or less orange-tinted brownish in color. 



