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SUPPLEMENT TO THE CRAG MOLLUSCA. 



specimens with the shorter variety (fig. 12 b of Tab. XI of Crag Moll.) of Rissoa cos- 

 t/data (P. Stefanisi of ' Supplement,' p. 73), and, allowing for the way in which they are 

 worn, I cannot detect any difference between them. 



The Walton specimens, although worn, present in places the same ribs and the same 

 cancellation as ornament the Cor. Crag specimen of this variety of Stefanisi ; and parti- 

 cularly the form, relative dimensions, and position of the slight umbilicus are identical. 

 I have not had the opportunity of examining the recent shells with which our fossils were 

 identified, but if they be thus identical they can only, I think, belong to the shell figured 

 12 b of Tab. XI of the ' Crag Mollusca.' The description given by Mr. A. Bell of his 

 new species Jejfreysii (Ann. and Mag. Nat. Hist., May, 1871, p. 10) quite accords 

 with the specimens I examined and with the shell figured by me in Tab. XI of my 

 original work. 



Fossarus lineolatus, S. Wood. Crag Moll, vol. i, p. 121, Tab. VIII, fig. 23 c — d, as 



var. lineolatus of Fossarus sulcatus. 



Fossaeus lineolatus, Wood. Catalogue, 1840. 



In the ' Crag Mollusca ' are figured two varieties of Fossarus sulcatus. Mr. Jeffreys 

 has referred one of them (var. lineolatus) to F. Japonicus, A. Adams. I have compared my 

 Crag fossils with that recent species, and I believe them to be specifically distinct. The 

 recent shell is shorter and more expanded, and it is ornamented with larger, coarser, and 

 fewer ridges. 



I treated var. lineolatus as a distinct species in my catalogue of 1840; and in this case, 

 as in many others, I am inclined to revert to my views of 1840, and to call this variety a 

 distinct species under my original name of lineolatus. M. Weinkanff refers Fossarus 

 sulcatus of 'Crag Moll.' to minutus, Michaud, 'Bull. Soc. Linn.,' II, t. 122, figs. 7 — 9; 

 but which of the two Crag varieties he thus refers I cannot make out. 



Cyclostrema LiEvis ? Phil. Supplement, Crag Moll., p. 86, Tab. V, fig. 13. 



Since my Crag shell was figured Mr. Jeffreys has sent to me for examination a 

 recent specimen which appears precisely to resemble my fossil, and this he considers to 

 be a new species, and proposes for it the name of basi-striata. He adds (in Lit.) that 

 lavis, Phil., is the same as serpuloides, but is different from the Crag shell. I think with 

 him that the Crag shell is distinct from serpuloides, and I so considered it at p. 86 of 

 this Supplement, and if it should prove to be the case that the Crag shell is not identical 

 with Philippi's lavis, it will require a new specific designation, which may be that of basi- 

 striata, which Mr. Jeffreys proposes. 



