110 Art. 1, — M. Yokoyauia : 



case the hole at the bottom is comparative! 3^ large, while in 

 the second it is comparatively small. Apertm-e subcircular. 

 Columella-lip covered with a thin callus. Outer lip thin. Height 

 3.5 millim. Diameter of shell 4.5 millim. Diameter of umbilical 

 margin about 1.5 millim. 



A few specimens, all of which are smaller than those described 

 by Tryon and Tenison- Woods. 



Fossil occurrence. — Otake, Shito. 



Living. — Tasmania. 



Genus SO].AKIJE:i.I.A, Woods. 



163. Solat'iella philippeiisis, Watson. 

 PI. V. Fig. 21. 



Solanella philipjiensis. Watson, Challenger Gastr., p. 73, pi. VI, fig. 10. 



Shell small, turbinate-conic, thin. Whorls about five, sharply 

 angulate a little above the middle. Surface above the angle flat, 

 nearly horizontal or a little sloping, below veiy steep, flat or very 

 slightly convex. The sculpture consists generally of two spiral 

 threads, the one forming the angle and the other situated near the 

 lower suture. Between these two, there are often one or two fainter 

 threads which sometimes may become rather coarse. Besides the 

 spiral threads, oblique lines of growth are everywhere conspicuous, 

 giving the shell a longitudinally striated appearance. Periphery 

 angulate with a thread upon it, striated by the above mentioned 

 lines of growth. Base shghtly convex, with a few spiral threads 

 either on the whole surface or only near the large open umbilicus. 

 Umbilical margin bluntly angulate. Umbilical wall very steep 

 and ornamented with spiral stride crossed by lines of growth. 

 Bottom-hole tolerably lai'ge. Aperture subcircular, with peristome 

 ■discontinuous. Outer lip thin. Height and Diameter 4 millim. 



The original colour of the shell is preserved in many specimens. 

 On the terrace above, there are several lathe-shaped dark purplish 

 blotches in a spiral row. Such blotches are also found on the 



