GASTEROPODA. 61 



9. CLAVATULA CANCELLATA. /. Sow. Tab. VII, fig. 9. 



Fusus CANCELLATUS. J. Sow. Min. Conch, t. 525, fig. 2, 1827. 

 PLEUROTOMA CANCELLATA. S. Wood. Catalogue 1842. 



CL Testa turritd elongato-fusiformi ; anfractibus 6 7, convexis ; superne planatis, 

 depressis, longitudinaliter costatis et transversim striatis clathratis ; papillis in angulis 

 sectionem acutis ; canali longimculd, subrectd. 



Shell slender, fusiform, and elongate ; apex acute ; spire elevated, with 6 7 convex 

 volutions, covered with decussating ridges, which are sharp and elevated at the point 

 of contact ; aperture ovate ; canal moderately long, very slightly recurved. 



Axis, | of an inch. 



Locality. Cor. Crag, Sutton. 



Red Crag, Walton Naze. ? Recent, Mediterranean. 



This elegant shell is at present rare from both formations. The sinus is rather 

 broad, producing a flattened or smooth canal around the spire, immediately at the 

 suture. The whorls are covered with longitudinal ribs, and with transverse ridges, 

 elevated and spinous at the points of junction. The lower part of the aperture is 

 slightly contracted, forming a distinct canal, which is open and very slightly recurved. 

 This is probably only a variety of Pleurot. reticulata, Bronn., Murex eckinatus, Broc. 

 (Tab. 8, fig. 3), Pleurot. Cordieri, Payr. 



10. CLAVATULA CONCINNATA. S. Wood. Tab. VII, fig. 1 1 a, 11 b. 



PLEUROTOMA RUFA (?). S. Wood. Catalogue 1842. 



CL Testa turriculd, elevatd, fusiformi; anfractibus convexiusculis, prope suturam obsolete 

 angulatis ; longitudinaliter oblique plicatis, plicis 10 13; transversim striatis ; aperturd 

 elongato-ovatd ; labro acuto ; canali breviusculd. 



Shell turriculate, elevated, and fusiform ; with an obsolete angularity a little below 

 the suture ; longitudinally plicated ; plicae or ribs oblique ; crossed and cancellated by 

 coarse and elevated striae, between which are finer lines ; outer lip sharp ; canal 

 moderate. 



Axis, 1 inch. 



Locality. Cor. Crag, Sutton and Gedgrave. 



This is not a very abundant shell, and is seldom perfect. The large figure is 

 from a specimen belonging to Mr. Perry. The outer lip curves a little, giving an 

 elegant obliquity to the folds, and the sinus is shallow a little below the suture. It is 

 crossed by about six or seven elevated lines, which decussate the exterior, and the 

 shell is covered between these with finer lines. It somewhat resembles the figure of 

 F. rufus, Gould (Invert. Massach., p. 290, f. 192), but differs from the British shell 

 M. rufus, Montague. It is, however, possible that it may be only an extreme variety 

 of C. turricula. Fig. 11 b is a more elongate variety. 



