i'LACOSTYLUS. 19 



stone" of Hobart Town ; subsequently Pfeiff'er described recent spe- 

 cimens as B. tasmaniciis. The identity of the fossil form with the 

 living was suspected by R. M. Johnston in 1880, and continued by 

 John Bra/ier a few years later. The fossil as originally figured in 

 Strzelecki's work corresponds in contour with the elongated whitish 

 specimens described by Pfeitfer, and the name tasmaiu'cttx therefore 

 becomes a synonym of typical gunni. In this form there is no 

 spiral striation in the specimens before me, even on the spire. 



Var. brachysoma n. v. (PI. 3, fig. 53). 



Much shorter and comparatively broader, thin, somewhat shining, 

 sculptured with rough, irregular, whitish growth wrinkles on a 

 greenish-yellow ground; spiral incised stria? cutting the wrinkles 

 above. Whorls nearly 4^, more convex. Aperture larger. Alt. 

 20, diani. 12.8, longest axis of aperture 13, width 8 mill. 



East Coast of Tasmania (Petterd). 



This may be only the short extreme in a continuous series of varia- 

 tions, but no intermediate examples are in the series examined. Ac- 

 cording to Cox the white typical form has a reddish-brown epidermis 

 in the young. 



Genus PLACOSTYLUS, Beck, 1837. 



Placostylus BECK, Index Molluscorum, p. 57, sole species P. 

 bootis Mke. (a composite of P. fibratus and P. shongi} MARTENS, 

 Die Hel., 1861, p. 185, type B. fibratus Marty n. 



Aspastus ALBERS, Die Heliceen, 1850, p. 149, sole species Bnli- 

 mus miltocheihis Rve. 



Charis ALBERS, t. c., p. 152, for B. malleatus and B. fulguratus. 

 Not Charis Hiibner, 1816 (Lepidoptera) or of Newm., 1841 (Cole- 

 optera). 



Eumecostylus ALBERS, Die Heliceen edit. v. Martens, p. 186, 1861, 

 type Bulinms cleryi Petit. 



Euplacostylus CROSSE, Journ. de Conchyl., 1875, p. 9, for B. koro- 

 ensis, kantavuensis, seemani, moussoni, elobatus and hoyti. 



Pcecilocharis KOBELT, Conchylien Cabinet, edit. 2, Placostylus, p. 

 79, for P. hartmanni Kob. 



Leucocharis, Placocharis and CaUistocharis PILSBRY, this volume. 



Diplomorpha ANCEY, 1884, q. v. 



