44 STROBILOPS OF JAPAN, KOREA AND CHINA. 



at the free edges. Nearly a fovirth of a whorl behind the aper- 

 ture there is an internal barrier composed of a short, blunt 

 columellar lamella, a series of three basal folds (the second 

 one longest, the others short), and a small fold within the 

 outer wall above the periphery. Some of these folds are visible 

 in an oblique view in the aperture. 



Height 1.85, diam. 2.7 mm. ; barely 5 whorls. 



Korea : Pyong-Yang, in the northwestern part of the penin- 

 sula (T. Kuroda). 



Strohilops coreana Pilsbry, Proc. A. N. S. Phila., vol. 78, 

 p. 470, name only. 



This is a smaller shell than S. hirasei, with smaller um- 

 bilicus, fewer whorls and four baso-palatal folds; differing 

 further by the infraparietal lamella, which emerges further 

 than in S. hirasei, about as far as the parietal lamella. The 

 internal armature of this species is practically identical with 

 that of S. nippomca, which is a larger shell with relatively 

 larger umbilicus. 



The relation of 8. coreana to 8. diodonUna must be con- 

 sidered when specimens of that species become available. 

 I do not understand Heude's description of the sculpture of 

 diodonUna — " epidermide strids plicisque crassis spiralihus 

 donato ' ' — terms which could not be applied to the very weakly 

 obliquely striate Korean species. S. diodontinu is said to be 

 about the size of 8. coreana, with five whorls and two emerging 

 parietal lamellae, but the umbilicus is described as moderate or 

 wide, and figured as contained about 5i/^ times in the diam- 

 eter, thus differing from 8. coreana. 



13. Strobilops HIRASEI Pilsbry. PI. 10, figs. 4, 5, 6, 7. 



The shell is rather depressed, with dome-shaped spire, the 

 periphery mainly rounded but indistinctly subangular in front 

 of the aperture, the base rather strongly convex; umbilicus 

 small, widened in the last half-whorl, contained about 5l^ 

 times in the diameter of shell (in some examples smaller, 6 

 times or 71/0 times in diameter). Opaque, cinnamon-brown, 

 without much gloss, smoothish, with low growth- wrinkles. 

 Whorls are strongly convex and increase slowly. The aper- 



