132 OPEAS GRACILE. 



forate, subulate, thin, smooth, pellucid, waxen, hyaline. 

 Spire elongate, the apex obtuse. Whorls 8, wide, a trifle 'con- 

 vex, the last scarcely one-fourth the total length; columella 

 short, rather straightened. Aperture oval-oblong, the base 

 subangulate; peristome simple, unexpanded, the columellar 

 margin shortly reflexed, appressed. Length 11, diam. 2.5, 

 aperture 2.5x1.33 mm. (Pfr.). 



Philippines: Dingle on the island Panay (Cuming, type 

 locality) ; see next paragraph for further localities. 



Blimus panayensis PFR., P. Z. S. 1846, p. 33. REEVE, 

 Conch. Icon, v, pi. 14, f . 76. 



Stenogyra panayensis Pfr., MARTENS Ostas. Zool. p. 83, 

 376, pi. 22, f. 8 (Siam, Timor, Ternate) ; "Webers Zool. Ergeb- 

 nisse Reise in Niederl. Ost-Indien, ii, p. 243 (Maumeri, 

 iPlores) ; Sitzungsber. Ges. Naturforsch. Freunde Dec. 1896, 

 p. 163 (Lombok). HIDALGO, Journ. de Conch. 1888, p. 34 

 (Philippines). SEMPER, Reisen, p. 137, pi. 8, f. 15, pi. 11, 

 f. 17, 21 (Philippine Is.; living animal, genitalia and teeth). 

 TAPPERONE CANEFRI, Ann. Mus. Civ. Genova xix, 1883, p. 

 87 (Aru Is.); xx, p. 144 (Amboina). Opeas panayensis 

 Pfr. FISCH. & DAUTZ., Mission Pavie Indo-Chine, iii, p. 411 

 (Siam, Tonkin, Saigon). 



As originally described, this form would seem to differ 

 from 0. gracile by the imperf orate axis, more slender shape 

 and smooth surface. The above description and figure 2 

 apply to this type form, which subsequent investigators do 

 not seem to have found. 



Prof, von Martens identified as panayensis a perforate 

 shell with striate whorls, typically more slender than 

 0. gracile, but believed by competent recent authorities, von 

 M'Oellendorff for instance, ;to intergrade with gracile, of 

 which it would be considered a synonym. Yon Marten's fig- 

 ure is copied, pi. 18, fig. 1. All but the first two references 

 given above seem to pertain to this Martensian panayensis, 

 which, if rightly identified by various authors, has a general 

 distribution from Indo-China to the Moluccas and Aru Is. 



