1 50 Edwin Ashby : 



of them are well-defined species, they were not described for a 

 good many years subsequent to the production of Mr. Sykes' 

 paper. 



Lepidoplcurus. — Specimens belonging to this genus are dealt 

 with towards the close of this paper. 



Callochiton rufus, Ashby (Trans. Roy. Soc. of S. Aust, vol. 

 xxiv., pt. ii., p. 86), mis-identified by Sykes as C. platessa Gould. 

 Ihis specimen is considerably smaller than the type which was- 

 described by me, 3rd September, 1900. It is a wonder that so- 

 good an observer as Mr. Sykes overlooked the deep pits or 

 grooves that traverse the pleural area in the median valves — 

 a feature that so clearly distinguishes this species from C. platessa r 

 Gl. Possibly it was only examined when wet, as this feature 

 might then be easily overlooked. Unless the specimen taken by 

 Dr. Thiele in Western Australia is referable to this shell, previ- 

 ously to this identification the type was unique. As both.were- 

 dredged it is undoubtedly a deep water species, and a very in- 

 teresting addition to the Victorian fauna. Sykes says that he- 

 examined it with specimens in the British Museum, named C\ 

 platessa, Gould, which raises the question as to the possibility of 

 the shell I named rufus being the same shell that Gould called 

 platessa. But this contention seems quite out of the question,, 

 for, while C. platessa, or the shell we have been in the habit of 

 calling by that name, is quite common at Port Jackson, the shell; 

 we are now discussing is not known from that locality at all. A 

 reference to Gould's description in his " Otia Conchologica," 

 which I now append, supports this view, for he makes no re- 

 ference to the deep grooves so characteristic of C. rufus. The 

 following quotation covers all his reference to the pleural areas 

 in which the deep grooves are situated : " Areis centralibus lineis 

 confertis acutis granulatis arcuatim decussatis." As compared 

 with platessa this specimen shows three distinct longitudinal" 

 grooves, which are absent in the former species, the shell is more 

 carinated than platessa, lateral area more raised, is more beaked,, 

 also the girdle scales are broader and shorter than platessa. It 

 corresponds with type of C. rufus [A Ashby, except that it is a 

 juvenile, one-quarter the size, and is more beaked than the type. 



Stenochiton pallens, Ashby. Mis-identified by Sykes as S.- 

 juloides, Ad. and Ang. Curiously enough this species was 

 described by myself in the same paper as the previous one. The 

 few specimens known have all been dredged. Messrs. Gatliff 

 and Gabriel sent me this specimen to compare with the type int 



