312 STUDIKS ON AUSTRALIAN MOLLUSCA, xi., 



Wales. It was also reported in Victoria as from "Portland (Mrs. 

 A. F. Kenyon), one specimen." So many exotic species, such as 

 Murex endivia, Drillia crenularis, Lotorium australe, Cassis fim~ 

 briata, and Euchelus atratus have been noted thus, that the associa- 

 tion does not inspire confidence. 



A related form is D. harpularia Des Moulins, which differs by 

 the radial riblets being more in number, oblique instead of vertical, 

 and by the interspaces being smooth instead of deeply grooved, as 

 in D. cemula. 



Drillia exarata Reeve. 



Pleurotoma exarata Reeve, Conch. Icon., L, 1845, PI. xxiii., fig. 

 201; Id., Verco, Trans. Roy. Soc. S.A., xxxiii., 1909, p. 296. 



In the British Museum, this species is represented by three lots ; 

 first, a single specimen marked as type; secondly, another labelled 

 "exarata, Reeve, (?) Panama, Jewett from the Smithsonian Inst. 

 65/11/12" ; thirdly, two from St Vincent's Gulf, presented by Dr. 

 Verco. The type, which is worn, differs decidedly from Dr. Verco's 

 shells. Both are the same general size and shape, but Dr. Verco's 

 are a little broader at the last whorl, and have raised spiral threads 

 cut into beads by radial grooves, whereas the type has no spirals. 

 The Jewett shell is a mere wreck, though as far as it goes it agrees 

 with Reeve's type. But I can find no note on D. exarata in Ameri- 

 can literature. 



No definite conclusions are offered on this subject, but the facts 

 above recited, suggest that further enquiry is desirable, and that 

 the Australian habitat may be impugned. 



Mitra carbon aria Swainson. 



This species has already been discussed, and at some length, in 

 these Studies {antea, xxxiii., p. 461), where it is shown to be what 

 in Australia has been commonly but erroneously called M. melani- 

 ana Lamarck. In the British Museum, I examined the unique type 

 of M. digna A. Adams, and was satisfied that, as has been stated 

 already, it should be included in Swainson's species. 



I also found, in the same case, one specimen marked type, and 

 labelled, "M. badia Rve., Conch. Icon., ii., f. 157, Hab. ? M.C." 



