OPEAS CLAVULINUM. 137 



fuse below; outer lip sinuous, thin; columella straight, verti- 

 cal, the edge reflexed and appressed except for a minute 

 umbilical chink. 



Length 10, diam. 3.3, aperture 3.3 mm. (Kayabe). 



Length 7, diam. 2.8, aperture 2.7 mm. (Kyoto). 



Length 7.7, diam. 2.7, aperture 2.3 mm. (Kyoto). 



Japan: Kyoto, Yamashiro. Types No. 78,757, A. N. S. P. 

 Also Kashima, Harima, etc. 



0. kyotoensis PILS., Proc. A. N. S. Phila. 1904, p. 638 

 (Nov. 2, 1904). 



This form is much more glossy than 0. gracile, less deeply 

 striate. It is not quite so glabrous as 0. mauritiamim pres- 

 toni, which moreover is more swollen near the summit, and 

 larger, with shorter whorls. The straight, vertical columella, 

 not expanding above, and forming a distinct angle with the 

 parietal wall is also characteristic. It resembles 0. clavu- 

 linum in almost every detail except the umbilical perfora- 

 tion, which is smaller, nearly closed. The aperture is rather 

 short and wide. The apex is large and the suture even, not 

 crenulate. Figs. 3, 4, 6 represent typical specimens from 

 Kyoto, 6 being a young shell. 



Some specimens which I refer to this species from Kayabe, 

 Ojima, in Yesso, are larger and a little more distinctly striate, 

 with the columella slightly arcuate. Others from Sado 

 Island are similar. 



A form from Kikai-ga-shima, Osumi, in the Oshima group 

 of the Ryukyu Is., differs by having a narrower aperture 

 (pi. 21, fig. 5). 



There is a tendency in Kyoto specimens toward a stout 

 form, when young resembling 0. brevispira to some extent. 

 One of these is figured, pi. 21, fig. 6. I have some doubt 

 whether kyotoensis can be considered even varietally distinct 

 from hawaiense. 



0. c. kyotoensis appeared in large numbers in Phipp's 

 conservatory in Schenley Park, Pittsburgh, Pa., in 1897. 

 Specimens from this source were distributed by Mr. G. H. 

 Clapp at that time. 



