106 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



This species belongs to the same p:roi;p as our C. Iclenmites. It 

 differs, however, in being sparsely ribbed, the upper whorls decreasing 

 in widtli regularly, not suddenly, so that the apex is scarcely mucro- 

 nate, and above all in that the axis of the narrower pear-shaped 

 aperture forms a more oblique angle with the axis of the shell. The 

 peristome of C. planostriata is besides scarcely thickened. 



We have before us two specimens received from Heude, measuring 

 alt. 12"2-12"8 mm. ; diam. max. 3 mm. Heude gives the diameter as 

 2 mm., which is probably a mistake. 



10. Clausilia Bkodekseni, n.sp. PL YIII. Fig. 5. 



Testa parva, subrimata, gracilis, anguste fusiformis, pellucida, 

 nitida, corneo - fulva ; spira turrita, apex acutulus. Anfr. 9 

 convexiusculi, sutura profunda interdum tenuissime albo-filosa 

 disjuncti, obsolete striati ; ultimus basi rotundus, subsaccatus, 

 valide costulato-striatus, i altitudinis testae non aequans. Apertura 

 parva, subverticalis, rotundato-piriformis, sinulo lato, erecto, superne 

 parum acuto. Peristoma, continuum, solutum, supeme sinuatum, 

 breviter expansum, intus purpureo-sublabiatum. Lamella superior 

 marginalis, humilis, verticalis, cum spirali aut contigua aut continua ; 

 inferior oblique asccndens, intus altior, superiori approximata, spira- 

 liter recedens, antice in extremo margine leviter nodulif era ; sub- 

 columellaris inferiori subparallela, filiformis, marginalis, utrinque 

 canalifcra. Sub lamella subcolumellari in basi aperturse pliculte 

 obsoletiB. Apparatus claustralis uti in Clausilia tau, sed principali 

 breviore ; lamella spiralis intus altior et longior quam lam. inferior. 

 Clausilium latum, basi rotundato-dilatatum, apice recurvo, lateraliter 

 subemarginato, acutato. 



Alt. 10-2-12 mm.; diam. max. 2-3-2-5 mm.; alt. apert. 2-5, lat. 

 apert. r8-2 mm. 



Hah. — Shekko, in the island of Hongkong. 



Differs from C. tau, Bttg., in its smaller and more slender shell and 

 its less distinct striation. The lamella inferior is higher [i.e. more 

 strongly developed) and approaches closer to the lamella spiralis ; it 

 runs out into two faint little knots. On the peristome at the base 

 of the aperture there are obsolete plaits, and the peristome is reddish- 

 brown. In C. tau var. cyclostoma, Molldff., from Canton, the lamella 

 inferior is typical, i.e. it is neither so high up in the interior of 

 the aperture, nor does it approach the lamella spiralis so closely as 

 in our species. The two knots or small plaits of the dextral margin 

 are similar to those in C. Gcrhchi, from the Lofoushan, but in the 

 latter the upper one at least is more pronounced. 



II. Sub-sect. PSEUDONENIA, Bttg. 



11. Clausilia Bensoni, H. Ad. 



H. Adams, Proc. Zool. Soc. 1870, p. 378, t. xxvii. fig. 10. Pfeiffer, 

 Mon. Hel. viv. 1877, viii. p. 487. Heude, Moll. terr. p. 156, 

 t. xxxiv. fig. 22. Non Bocttger, in Eilber, Sitz. Ber. Akad. Wien, 

 Abth. I. 1883, p. 1375, t. vi. fig. 8. 



