OPEAS. 361 



The species is referred to Oiieas: by Pilsbry witli some doubt, 

 who considers that " tlie subtruncate, calloused columella recalls 

 Torta.vis, yet the delicacy of the shell, its small apex, and the 

 oviparous reproduction, are characters of Opens. It is probably 

 related to 0. avenacea, Morel., javanicum, K-ve., etc., which have 

 the coluuiella similarly truncate."' 



I have only seen one specimen, which is in the British Museum. 

 It is I'l-om Kaiidy and measures: length l(r5 nun., diani. 

 4-25 mm. 



324. Opeas sykesi, PUshnj. 



Ojnas si/kcsi, Pilsbrv, MiUi. Conch, ser. 2, xviii, 1900, p. l-')7. pi. 2\, 

 tigs, i, 2. 



Oru/iiud description: — "Shell perforate, resembling 0. (/mcile 

 in sculpture, but with the whorls much shorter, more compactly 

 coiled, more mimerous in shells of the same length. Spire 

 straightly and regularly tapering to the small apex. Wliorls 

 87 to 10, the endjryonic U smooth except for a minute subsutural 

 radial striation, which becoming stronger on tlie post-embryonic 

 whorls, produce a fine, irregularly developed creuulaliou of the 

 suture, the latter becoming smooth again lower down. Later 

 whorls somewhat flattened. Suture well impressed. Aperture 

 vertical, mucJb shorter than in O.cjracile; outer lip weakly arcuate, 

 a little arched forward ; basal margin well arched ; columella 

 rather straightened, the edge reflexed. 



" Length 11 , diam. 34, aperture 29 mm. ; ^^ hods 8|. 



" Length 12*9, diam. 3-5, aperture 3*1 ; whorls 10." (PiJsbrif.) 



Ilah. Ceylon. 



" This form is readily selected from among 0. (p-acile by its 

 short w-horls and small, wider mouth, with a deep bay where the 

 columella joins the parietal wall. I do not see, in the great 

 number of 0. r/rucile before me, anv approach to this form." 

 {Filshnj.) 



325. Opeas ? pusillus, //. Adams. 



BuUmulus (^Ena) piixilliis, II. Adams, P. Z. S. 1867, p. '307, pi. 19, 



- ^- ^^- . . . 



Sfenofiyra pusillus, Nevill, Enum. Helic. Ceylon, 1871, p. o. 



Buliums {Bulinmlus) pusillus, Pfeiffer, Mon. Helic. Viv. viii. 1877, 



p. ISO. 

 BuUmulus {Leptomerus) pusillus, Pfeiffer & Clessin, N(Miiencl. 



Helic. Viv. 1881, p. 234. 

 Ena pusilla, Jousseaunie, !Mem. Soc. Zool. France, vii. 1894. 



p. 297. 



Original description: — '" 13. testa sinistrorsa, rimato-perforata, 

 cyliudfico-lurrita, tenui, iuicqualiter striata, vix nitidula. olivaceo- 

 fusca ; spira elongata, sursum parum attenua^a, a])ice obtusiuscula, 

 sutura distiucta ; anfr. 7, convexiusculis, ultimo g longitudiuis vix 



