126 Quarterly Journal of Conchologv. 



sculpti ; apertura ovata, longitudinis testx totius -6 adequans ; 



coluinella let'iter obliqua, parum arcuaia, vixqne co?itorta^ 



superne expansa et reflexa ri?nam parz'affi fere tegens. 

 Long. yY-z mill- Diam. 3^- 



Shell subovate, narrowly perforate, brownish horn-colour, a 

 little shining, with the spire gradated, and moderately elongate ; 

 whorls 4 — 4^, convex, roundly tabulated above, divided by a 

 deep impressed suture and sculptured with fine lines of growth 

 and minute spiral striations ; the aperture ovate, about equalling 

 •6 of the entire length of the shell ; the columella slightly oblique, 

 only a little arched, and scarcely twisted, expanded above and 

 reflexed, almost covering the slight fissure. 



Ilab. Yokohama. " Abundant on moist rocks in several 

 places on the sea shore or near the sea." (Goodwin.) 



This species is somewhat allied to the European Z. truncatuhi 

 which has been found in several parts of north-east Asia. How- 

 ever the considerably more elongated spire, the greater number 

 of its whorls, and the much smaller aperture well distinguish it 

 from the present species. As a guide to the form of L. Good- 

 wi?m, I may cite the figure of L. vitrea in the Conchol. Iconica 

 pi. 14, fig. 94, which in outline is very like it, but the columella 

 is not so twisted. The whorls are distinctly turreted and separa- 

 ted by a deeply impressed suture. The minute spiral striation is 

 more apparent in some specimens than in others, but at all times 

 it is only observable under a powerful lens. 



19. Planorbis spirillus Gould? — This is I believe the only 

 species of Planorbis which has been as yet recorded 

 from Japan. It is with considerable doubt that I 

 refer the specimens sent by Mr. Goodwin to this 

 species, the reason being that I am uncertain with 

 regard to the meaning " liris ad quatuor prope aper 

 turam instructa.'" They are concave above and below 

 as described by Gould, more so on the inferior than 

 on the upper surface and the last whorl is faintly 

 obtusely angled, the suture is very deeply impressed 

 and the whorls are very finely striated by the arcuate 

 lines of growth. 



