BY C. IIEDLEY. 19 



Hah. — Darnle}^ Island, Torres Straits; several examples 

 dredged by Mr. J. Brazier, in 30 fathoms. 



Type. — To be preserved in the Australian Museum. 



Cyllene lactea, Adams & Angas. 



Adams k Angas, P.Z.S., 1863, p. 422; 1867, p. 191. 

 (Plate ii., fig. 10.) 



A drawing is now presented of this hitherto unfigured species. 

 The original is 13 mm. in length and 6-5 in breadth. It was 

 identified by Mr. Brazier, and was dredged by him in 8 fathoms 

 off the inner North Head, Sydney Harbour. The colour is not 

 always as described by the specific name. Some shells are 

 marbled with pale brown, and have below the suture alternate 

 white and da.rk brown spaces. 



Cantharidus decoratus, Philippi. 



This common shell varies a little;^' some specimens are more 

 sharply keeled and some are broader in proportion to their height 

 than others ; the spiral lines of granules differ in their develop- 

 ment, and the colouration is not always the same. Owing 

 partly to this, but chiefly to insufficient material, it seems to me 

 that several names have been applied to it. After diligent study 

 I can find no essential difference between the descriptions and 

 figures in the Conchylien Cabinet of Trochus decoratus {^. 59), T, 

 fragum (p. 257), and T. pyrgos (p. 297), all of Philippi. Indeed, 

 my chief difficulty in uniting these is to believe that so careful an 

 author could thus err. No subsequent conchologist has recognised 

 all three species. For instance. Smith sees T. decoratus in the 

 Sydney shell, but refers to fragum as only known to him in 

 literature ; again, Pilsbry recognises the Sydney shell as I', pyrgos^ 

 but T. decoratus is for him a name in books. 



The description of Thalotia zeh7'ides by A. Adams is without 

 measurement or locality, and is quite useless for discrimination. 

 Angas, doubtless informed by Adams, thus determined and 



* As noticed by Reeve, Conch. Icon, xiv., 1863, Ziziphinus, PI. v., f. 36. 



