534 STUDIES ON AUSTRALIAN MOLLUSCA, IX., 



MiTROMORPHA PALLIDULA, 11. sp. 



(Plate xxxii., fig.26). 



Shell small, narrow fusiform, blunt at each end. Whorl& 

 wound obliquely, five including a protoconch of a whorl and one- 

 half. Colour dull white; on the last whorl are two narrow, pale 

 brown, spiral bands, one on the periphery, the other between it 

 and the canal; the lower one is more defined and spreads over 

 five ridges and furrows. Sculpture : the dome-shaped protoconch 

 is carved with fine, close, radial riblets, and concludes with a 

 slight varix. Adult sculpture commences suddenly with seven 

 evenly spaced spiral ridges and equal furrows; these gradually 

 increase in size and number. On the last whorl the ridges 

 amount to twentj^-six, growing smaller and more crowded ante- 

 riorly. The ridges are square in section, polished, and a little 

 narrower than the flat furrows, which are radially striated. 

 Aperture narrow, columella excavate, anal sinus indistinguish- 

 able, canal a notch. Length 4-n, breadth 1-5 mm. 



Hah. — Manly Beach, near Sydney; a single specimen collected 

 by Miss L. Parkes. 



T y p e. — Miss Parkes has generously presented her type speci- 

 men to the Australian Museum. 



The novelty belongs to a small group comprising M. brazieri 

 Smith, from this State, M. siibstriata Suter, and M. suteri 

 Murdoch, from New Zealand, which though lacking a columellar 

 fold, has been referred by Smith* to Ilitromorpha. This group 

 does not embrace M. alba Petterd, wrongly thought by Tate and 

 Mayt to be the same as M. brazieri. 



Since writing the above, Mr. W. L. May has shown me a speci- 

 men taken by Mr. A. Morton and himself in 24 fathoms off the 

 mouth of the Derwent Pviver, Tasmania. 



Pleurotoma sterrha Watson. 



Every detail of figure, description and locality given for this 

 species so exactly corresponds to the characters mentioned by 



* Proc. Zool. iSoc. 1891, p. 486. 

 f These Proceedings, xxvi. 1891, p.456. 



