9b STUDIES ON AUSTRALIAN MOLLUSCA, 



the shell in F. Ihieata The animal can quite conceal itself 

 within the shell; when entirely retracted the shell touches the 

 ground at the anterior end, but a slight gape remains behind. 

 When fully exserted, as in my figure, a series of filaments project 

 from beneath the margin of the shell, each answering to a radial 

 of the shell sculpture; beneath and beyond these, the mantle 

 skirt depends; the latter is often puckered into waves and can be 

 extended to about twice the length of the filaments. Below the 

 mantle is the usual row of epipodial filaments. Muzzle slightly 

 bilobed. Tentacles moderately stout, slightly tapering, sharply 

 pointed, frequently engaged in searching the ground with a slow 

 sweeping motion. Tail short and blunt. Anal tube very little 

 exserted, surrounded by a dozen small papilla?. Mantle and 

 filaments pale yellow, remainder of body creamy white, anal tube 

 dark brown. 



Cerithium tenue, Sowerby. 



Sowerby, Thesaurus Conch, ii. 1855, p. 876, pi. clxxxiv. 

 fig. 212 (202). 



This species was originally described from Port Lincoln, South 

 Australia. An examination of South Australian specimens 

 induces me to unite with it Bittium.variegatum, Brazier, described 

 in these Proceedings (Second Series, ix. 1894, p. 172, pi. xiv. fig. 9). 



Teinostoma orbitum, n.sp. 



(Plate iii, figs. 13, 14 & 15.) 



Shell large for the genus, solid, opaque, glossy, subdiscoioal, 

 spire hardly elevated, bluntly angled at the peripheiy, flattened 

 on the base, and narrowly perforate. Whorls three and a half, 

 rapidly increasing, separated by a deeply furrowed suture. 

 Colour white. Sculpture : to the unaided eye the shell is smooth, 

 under the lens it is seen to be finely, closely spirally grooved 

 throughout, except on the umbilical funicle. On the upper 

 whorls are half-developed low, broad, radiating costse, which 

 gradually disappear on the penultimate whorl. Everywhere the 

 grooves are crossed by delicate growth-lines, which increase 



