1881.] Mollusca of the Lido- Malayan Fauna. IG1 



Larina cincta, G. Nevill, PI V, Fig. 6. 



Cat. Moll. Fasc. E, 1877, Poorce, alt. 5\, diam. 3£ mil. 



I have nothing to add to my original description of this species ; with 

 regard, however, to Larina, I may point out as a synonym of it the genus 

 described under the name of ' Bobinsonia' by my brother, Hugh Nevill 

 (Proc. Ceylon Asiat. Soc, 1869), the two typical species of which I figured 

 in this Journal for 1871, pi. 1, figs. 5 and 6 ; the latter, Larina (= Bobin- 

 sonia) pusilla, Nev., is evidently very closely allied to my L. cincta, but 

 can apparently be distinguished by the less produced spire (the apical 

 whorls especially being less prominently exserted), the larger and less 

 deflected aperture, and the more ventricose last whorl. Larina (= Bobin- 

 sonia) ceylonica, Nev. is exceedingly close to Blanford's figure of 

 L. lurmana in this Journal for 1867, pi. 13, fig. 1 and appears to be 

 only distinguished by its more broadly transverse shape, and it is probably 

 only a variety of it. 



Rissoina baxteriana, n. sp. 



Thick, solid, smooth and shining, shortly turreted, white, spire conically 

 ovate, moderately produced, suture excavate, apex somewhat bluntly point- 

 ed ; whorls 5-g-, turretedly planulate, the last four distantly ribbed longitudin- 

 ally, ribs nearly perpendicular, except on the last whorl, where they are 

 subabruptly and obliquely angled at the periphery, disappearing altogether 

 at some little distance from the base in a broad, somewhat superficial 

 groove, which is below encircled with a rather indistinct, raised, transverse 

 keel, throughout the ribs are bisected with transverse strise, well developed 

 at the points of intersection, which thus become nodulose ; the aperture 

 is perpendicular, without basal canaliculation, broader at base, with the 

 peristome rather acute, but slightly convex and the columellar margin 

 straight, subangulate at base ; I can perceive no callosity joining the margins 

 in the specimens I have examined. 



Long. 3, diam. 1^ mil. 



Found in sand from Roweiah, Red Sea, rare, by Mr. J. B. Baxter, 

 F. Z. S., in whose honour I have named this most distinct small form, 

 altogether unlike any species I know ; in sculpture, the B. nodicincta of 

 A. Adams, from the Philippines, is the only one at all resembling it. 



Type, Indian Museum ; also in coll. Baxter and Weinkauff. 



RlSSOINA ORIENTALIS, n. Sp. 



Thick, smooth, polished and shining; white, sometimes encircled with a 

 single brown band, spire conically ovate, not much produced, with the suture 

 distinct and the apex obtusely mammillate ; whorls Q\ to 7, convex, the first 

 three without sculpture, the other four longitudinally rather distantly and 



