65 



ture ; wliorls 5-6, spirally grooved, rounded, angular at tlie 

 upper part and sligHtly concave at tlie suture ; strongly variced 

 longitudinally, the lirse made by the spiral grooves ending in 

 open foliations on the varices of the body whorl, which are 

 eight in number, and terminating in the vicinity of the 

 umbilicus in coarse raised laminae ; outer lip finely notched on 

 the margin and crenate internally ; inner lip smooth, spreading 

 over the columella ; light fulvous brown, ribs deeper in colour, 

 pinkish inside ; length 12, breadth 6 lines. 



St. Vincent's Grulf (Tate, Bednall). Kangaroo Island 

 (Tate). " Dredged along with horny zoophytes and nullipores 

 at a depth of seven or eight fathoms" (Angas). 



Tasmania (Tenison Woods). 



Moreton Bay, Queensland (Strange). 



following Mr. Gr. E. Angas in his paper on the Marine 

 Molluscan Fauna of South Australia, contributed to the 

 Zoological Society in 1865, I had named my specimens of this 

 shell and catalogued it in this paper as M. scalao^is of Adams, 

 but Professor Tate has not only kindly shown me the original 

 description and figure of Quoy and G-aimard in that magnificent 

 work the Voyage of the Astrolabe, but a very perfect and 

 beautiful specimen obtained by him at Kangaroo Island ; also a 

 very large fossil example from the Tertiary formation of New 

 Zealand. From the comparisons made I feel sure that there 

 can be no doubt of the identification of the South Australian 

 shell with M. octogonus. In New Zealand the species attains 

 twice the size it does in these waters, and in the type specimen 

 figured by Quoy the foliations on the varices are much more 

 prominent. Mr. Tryon reproduces Quoy's figures in his 

 Manual of Conchology, vol. ii., pi. 30, figs. 272 and 273. He 

 also gives a representation of M. cicspidatus, Sow. (fig. 24), 

 which he says is a synonym. This more nearly represents our 

 form than the original. By rejecting the synonyms of Adams 

 and Woods it will be seen that the shell under review is re- 

 corded from South Australia, Tasmania, New Zealand, and 

 Queensland, but not from New South Wales ; the description 

 and figure of the M. Brazieo^i of Angas, noted above, from that 

 part of the Australian coast, answer so closely to M. octogonus 

 that there is little room to doubt that it is that species 

 described from an immature shell. 



In the Manual of Conchology before referred to Mr. Tryon 

 has expunged the M. scalaris of Adams, and substituted for it 

 the name of M. Angasi, adding the following remarks ; — " Said 

 to resemble M. cristatus, Brocchi. Possibly identical with 

 M. octogonus (Quoy et G-aim) . As Brocchi has used the name 

 for a fossil species, this may be known as M. Angasi.'' There 

 was little occasion for Mr. Tryon to rename M. scalaris, as 



