360 PLIOCENE MOLLUSCA. 



specimens referred to F. Waelii by Wood are Pliocene and not Oligocene, grouping 

 them with the form described on p. 142 as Searlesia Rami. 



In his recent revision of the north Pacific Buccinidse (Proc. Biol. Soc. 

 Washington, vol. xxix, p. 7, 1916), Dr. W. H. Dall has adopted the generic term 

 Searlesia for the group represented by Trophon costifer, S. V. Wood, of the 

 English Crag, and by Baccinum dirum, Reeve, a species now living in Puget Sound. 



Genus FUSUS, Klein [continued from p.. 175). 

 Fusus Rigaccii, Cerulli-Irelli. Plate XXXVIII, fig. 16. 



1911. Fusus Rigaccii, Cerulli-Irelli, Palaeont. Ital., vol. xvii, p. 239, pi. xxii, fig. 5. 

 1915. Fus2is Rigaccii, A. Bell, G-eol. Mag. [6], vol. ii, p. 167. 



Specific Characters. — Shell fairly large, solid and strong, fusiform ; whorls 7 or 

 8, decidedly convex, the last much the largest ; ornamented by about twelve 

 prominent costse not so wide as the intervening spaces, extending from suture to 

 suture, and by well-marked spiral ridges, parallel and equidistant, reaching the 

 base of the shell, with finer ones between them, together with numerous lines 

 of growth; suture distinct, not marginate; mouth ovate; canal narrow, long, 

 turning slightly to the left ; columella expanded in the centre. 



Dimensions. — L. 60 mm. B. 20 mm. 



Distribution. — Not known living. 

 Fossil : Isle of Man. 



Upper Pliocene : Monte Mario, Farnesina. 



Remarks. — Among a consignment of fossils from the Isle of Man recently 

 received from the Rev. S. N. Harrison, Mr. Bell has discovered an imperfect 

 specimen which so far as it goes appears to correspond with Sign. Cerulli-Irelli's 

 figure and description of this species. It is an interesting find, as it supports the 

 view that the fauna of the Manxland deposits contains a considerable number of 

 typical Pliocene shells. 



Fusus imperspicuus, S. V. Wood. Plate XXXVIII, figs. 17, 18. 



1848-72. Trophon imperspicuum, S. V. Wood, Mon. Crag Moll., pt, i, p. 50, pi. vi, fig. 12, 1848 ; 

 Fusus imperspicuus, 1st Suppl., pt. i, p. 29, pi. ii, fig. 4, 1872. 



1871. Trophon imperspicuum, Jeffreys in Prestwich, Quart. Journ. G-eol. Soc, vol. xxvii, p. 146. 



1872. Fusus imperspicuus, A. and R. Bell, Proc. Ceol. Assoc, vol. ii, p. 203. 

 1890. Fusus imperspicuus, C. Reid, Plioc. Dep. Brit., p. 245. 



Specific Characters. — Shell elongato-fusiform, turreted, of moderate size, rather 

 thin, slender; whorls 8, convex, the last nearly two-thirds the total length; 



