474 STUDIES ON AUSTRALIAN MOLLUSCA, X., 



This species occurs, though rarely, as far south as Sydney. 

 I frequently met with detached valves cast up on the sandy beach 

 facing the ocean at Byron Bay, N.S.W. The example figured is 

 from More ton Island, Queensland. 



The most northern point to which I have traced it is near 

 Bundaberg, where Dr. T. May found it. 



This species marks the first occurrence of its genus in Australia, 

 and is contained in that section which Dr. W. H. Dall has named 

 Aeretica* It is most nearly related to S. senegalensis Hanley. 

 In the absence of actual specimens, I had indeed named and 

 distributed it as that species. Now that Dr. Lamy, of Paris, has 

 kindly given me authentic specimens of S. senegalensis, I am able 

 to distinguish the Australian from the African shell. The 

 posterior side of S. euronia is shorter and more rounded, and its 

 anterior part is smooth; whereas S. senegalensis anteriorly has 

 fine sharp concentric grooves. In size and colour the two species 

 also differ. 



Strigilla grossiana, n.sp. 



(Plate ix., fig.21.) 



Shell rather large and solid, compressed, ovate-cordate, inequi- 

 lateral, rounded anteriorly, and produced posteriorly. Colour 

 externally white, banded and suffused with pale pink or purple, 

 umbo pink; internally brilliant geranium-pink, with a narrow 

 white border. Sculpture anteriorly concentric, then flexed first 

 up and down, passing at one-third of the length into the fine oblique 

 lines which cover the central area, along a well defined radial line 

 at three-quarters of the length, the sculpture turns at an acute 

 angle upwards, curves round, and concludes as concentric. Over 

 all the eccentric threads run minor regular concentric growth- 

 lines. Length, 24; height, 21; depth of single valve, 5 mm. 



This handsome and distinct species is represented by a single 

 imperfect right valve, collected in Moreton Bay by Mr. George 

 Gross, to whom it is dedicated. The exact locality is the inner 



* Dall, Trans. Wagner Free Inst. Sci. iii. 1900, p. 1038. 



