CCELOCION. 



Length 15.7, diam. above aperture 4 mm. ; whorls 9. 

 Warroo. 



Australia, Queensland coast: Port Mackay (Turner) ; Port 

 Molle (MacGillivray, type loc.) ; Warroo Station (Musson),. 

 and Miriam Vale (Blackmail), Port Curtis; Cania and North, 

 Pine River (Musson); Caboolture (Wilde). 



Balea australis FORBES, Appendix to Narrative of the Voy- 

 age of H. M. S. Rattlesnake, ii, p. 380, pi. 2, f. 9, a, 1) (1852). 

 PFR., Mon. Hel. Viv., iii, p. 584. Cox, Monogr. Australian 

 Land Shells, p. 81, pi. 12, f. 16, 16a (good). Cceliaxis aus- 

 tralis Forbes, FISCHER,, Journ. de Conchyl., xxxi, 1883, p. 

 101, pi. 3, f. 4 (shell) ; f. 5, 6 (dentition) . HEDLEY & MUS- 

 SON, Proc. Linn. Soc. N. S. Wales, vi, p. 559 (habits). Cox, 

 t. c., p. 570, pi. 21, f. 4, 7 (young), f. 9 (living animal) .- 

 Perrieria australis Forbes, HEDLEY, Proc. L. S. N. S. Wales, 

 vii, p. 313 (1893). Cceliaxis exigua ADAMS & ANGAS, Proc. 

 Zool. Soc. Lond., 1867, pp. 890, 907, pi. 43, f. 16, ll.Balca 

 exigua A. & A., PFR., Monogr., vi, p. 395. 



The young shell, according to Cox, is multispiral and has 

 a rather large, obtuse summit, the second whorl bulging be- 

 yond the following ones, the contour being similar to the 

 upper half of Cceliaxis layardi. The summit is successively 

 truncated, beginning with the bulging second whorl ; the cav- 

 ity of the shell being closed by a convex subvertical septum. 

 The strongly tapering, concave-sided young shells opened by 

 me have two spiral cord-like lamellae on the axis in the last 

 two whorls, and a thin lamella on the basal wall. AMth ad- 

 vancing growth, the upper axial lamella and that on the base 

 are progressively absorbed. 



Mr. C. T. Musson found P. australis under logs and stones 

 in " scrubs;" from a square yard of ground 150 specimens 

 were obtained. It is very local. 



The description above and figure 26 are from specimens 

 from Warroo, Port Curtis. These are usually smaller than 

 those from farther south, and almost denuded of the very 

 thin cuticle. The aperture is noticeably wider, the parietal 

 lamella stronger, and the columellar lamelke are often visible 

 in the throat ; but they differ especially in the narrower um- 



