MUREX (PTEROPURPURA) BOYTONENSIS. 339 



Genus MUREX, Linne {continual from p. 124). 

 Murex recticanalis, S. V. Wood. 



1879. Murex recticanalis, S. V. Wood, Mon. Crag Moll., 2nd Suppl., p. 15, pi. i, fig. 7. 

 1890. Murex recticanalis, C. Reid, Plioc. Dep. Brit., p. 247. 



Specific Characters. — Shell small, fragile, fusiform, turreted ; whorls 5 or 6, 

 convex, squarely angulate above, with a shelf below the suture ; ornamented 

 by longitudinal costae with rounded or sub-spinous points where they cross the 

 keel, clathrated by well-marked spiral ridges ; spire short, rapidly diminishing in 

 size upwards; suture wide and deep; mouth ovate, obtusely angulated by the keel; 

 canal fairly long, open. 



Dimensions. — L. 12 mm. B. 6 mm. 



Distribution. — Not known living. 



Fossil: Coralline Crag : Sutton. 



Remarks. — M. Dollfus has expressed a doubt whether the specimen figured by 

 Wood under this name can be satisfactorily referred to the genus Murex, suggesting 

 it may be a Trophon or possibly a Fusus. It was originally described from an 

 imperfect but not waterworn example from the Coralline Crag of Sutton. There 

 is another, perfect, in the Sedgwick Museum at Cambridge, labelled M. recticanalis, 

 Newbourn, but it is not the same as Wood's shell. I retain provisionally his 

 generic name for the Sutton fossil. 



Sub-genus PTEROPURPURA, Jousseaume, 187l>. 



Murex (Pteropurpura) boytonensis (F. W. Harmer). Plate XII, fig. 8 ; 



Plate XXXV, fig. 21 . 



1914. Ocinebra tortuosa, var. boytonensis, F. W. Harmer, Plioc. Moll. G-t. Brit., pt. i, p. 125, pi. xii, 

 fig. 8. 



Specific Characters. — Shell large and solid, ovato-turreted, with a pyramidal 

 spire ; whorls 6, the last much the largest, rapidly diminishing in size towards a 

 rounded apex ; coarsely ornamented by three thin projecting wing-like varices, 

 continuous across the suture, connecting the whorls, and by well-marked, rather 

 distant transverse ridges reaching the base of the shell, the upper one on each 

 whorl forming an indistinct angulation with a sloping shelf below the suture ; 

 mouth pyriform, contracted at the commencement of the canal; canal short, open,, 

 narrow ; outer lip thickened, expanded, so as to form a triangular space at the 

 base ; inner lip large, detached below. 



Dimensions. — L. 52 mm. B. 28 mm. 



