TROPHON MURIOATUS. 133 



Bemarls. — This variety separates itself from the type by its solid character, and 

 its stronger and more clearly defined scnlptnre. Both the longitudinal and spiral 

 costae are fewer in number and consequently further apart, giving the shell a 

 reticulate appearance ; the whorls are indistinctly keeled, forming a sloping shelf 

 below the suture and causing the upper part of the mouth to be somewhat more 

 angulate than in the normal form. 



On showing my specimens to the Marchese di Monterosato, he was kind enough 

 to point out their resemblance to a fossil shell found at Oreto, near Palermo, which 

 he calls var. valida. I figure one of my Oakley specimens under that name. 



Var. similis, nov. Plate XII, fig. 20. 



Dimensions.— Jj. 12 — 14 mm. B. 8 mm. 



Distribution. — Not known living. 



Fossil : Waltonian Crag : Walton-on-Naze, Beaumont, Little 

 Oakley. 



Ileinavl-s. — I have found -50 or 60 specimens of this variety at Oakley and a few 

 others at Walton and Beaumont. It appears to be intermediate between the 

 typical T. mnricatus and 7'. Fabricii. 



In form and sculpture it resembles a Recent example of the latter in my collec- 

 tion, but it is only one third the size ; it differs from that figured by Forbes from 

 "Wexford,^ described here as T. Fabricii, var. Bailiji, and from those given by Wood 

 as T. Fabricii^ and 2\ craticulatiis,^ as well as from the Recent shell, in that the 

 mouth has a thickened lip, denticulated within, and from Prof. Forbes' specimen 

 in the Jermyn Street Museum, in that it is not spinous nor so strongly angulated 

 by the keel. I do not think it is the same as the latter, and prefer to regard it 

 as a variety of T. mnricatus. 



Var. Nysti, nov. Plate XII, fig. 19. 



1881. Trophon mnricatus, Nyst, Couch. Terr. Tert. Belg., p. 6, pi. i, fig. 4. 



Varietal Characters. — Shell turreted, small, strong and solid ; whorls convex, 

 longitudinally and spirally costate ; the spire is much shorter in proportion than 

 in the type, and the body-whorl considerably larger than the one next above it ; 

 outer lip expanded, thickened, and strongly denticulate within ; canal narrow and 

 very short. 



Dimensions. — L. 8 mm. B. 4 mm. 



1 Mem. Geo). Surv., vol. i, p. 426, 1846. 



" Mod. Crag Moll., pt. ii, tab. xxxi, fig. 4, 1850. 



^ Mon. Crag Moll., 1st Suppl., tab. iii, fig. 1, 1872. 



