A. E. Verrill — Mollusca of the New England Coast. 255 



with T. rhysus and T. ceglees Watson and T. Vaillanti Fischer. 

 The first named is fossil in the Pliocene of Calabria and Sicily. The 

 recent form has been taken off the European coast, from off the Faroe 

 Islands to the Bay of Biscay and Mediterranean, and by the 

 Challenger in the West Indies, off St. Thomas. 



The typical specimen of T. ceglees Watson, which I have examined, 

 although having some resemblance to our shell, differs so much in 

 many respects that, considered by themselves, they certainly appear 

 to me very distinct species. I have not seen the fossil T. Ottoi, 

 and am, therefore, unable to expi'ess any decided opinion as to the 

 identity of the recent and fossil forms, especially as Mr. Jeffreys 

 himself admits a considerable amount of variation in respect to the 

 sculpture and umbilicus. These forms are doubtless closely allied, 

 if not identical. T. ceglees appears to be nearer our M. lamellosa^ 

 with which Mr. Dall has even united it. 



Cyclostrema Dalli Verriii, var. ornatum, nov. 



Cyclostrema Dalli Yerrill, these Transactions, vol. v, p. 513, pi. 57, fig. 39. 

 Plate XXXII, figure 17. 



Among the specimens of this species there is one from station 2115, 

 in 843 fathoms (No. 35,610) which, although agreeing in form and 

 condition of the umbilical region with the original type, is very 

 peculiarly marked on the base by thin, imj^ressed lines, running 

 obliquely and crossing the concentric spiral lines at a large angle, 

 so as to produce a sort of " herring-bone " pattern as shown in our 

 figure. This form, if persistent, should undoubtedly receive a varietal 

 name. It may therefore be designated provisionally as var. ornatum. 



This species would probably belong to the genus Tharsis, accord- 

 ing to Jeffreys' classification, but as already stated, I doubt the 

 validity of that generic division. 



Fissurella Tanneri Vorriii. 



Proc. U. S. National Mus., vol. v, p. 333, 1882. 



Plate XXIX, figures 13, 13a. 

 This species is closely allied to Fissurella redimicula Say,* 

 originally described from the Miocene of Maryland. The latter, 

 however, judging from three specimens which I have examined, is 

 distinct, although it is probably the direct ancestral form from which 

 the modern species has been derived. The fossil specimens are 

 * Journ. Acad. Nat. Sci. Phil., iv, p. 132, pi. 8, fig. 1, 1824. 



