DX7NDEY GASTEEOPODA. 51 



Shell conical, acute ; whorls flat in the middle, convex above 

 and below where they bend into the deep suture, which separates 

 them profoundly. The ornamentation consists of longitudinal 

 lines, and oblique decussating transverse lines, inclined as usual 

 in opposite directions on either side of the sinus-band ; the young 

 whorls have a cancellated appearance, but in the old whorls the 

 part of the whorl above the sinus-band has a smooth appearance 

 from the absence of the longitudinal, and faintness of the cross- 

 lines. Sinus-band broad, with three spiral bands crossed by 

 curved lines ; it is below the middle of the whorl, and is not 

 salient. The umbilicus is broad and deep. Base of last whorl 

 convex. 



It differs from P, sulplatyspira d^riA physospiray D'Orb., by the 

 deep divisions between the whorls, the more open angle, and the 

 bandlets of the sinus-band. 



The specimen figured is about half the height of our larger one. 



There are two specimens in the Museum. 



Locality — Dundry. Inf. OoL 



PLEUROTOMAETA SArZEAJN'A, D'Orbigny. 



1847 P, Sauzeana, D'Orb. Prodrome I. p. 267. 

 1850 D'Orb. Pal. fr. Terr. Jur. 2, Gast. 



pi. 373. 



Height (if complete) 95 mm. 



Our shell differs only from the type in having a little wider 

 angle, but the form of the whorls and position of the tubercles, 

 &c. are similar. 



There is one specimen in the Museum. 



Locality — Dundry. Inf. 061. 



PLETJEOTOMARIA EASCIATA, Sowerby. 



1816 Trochus fasciatus, Min. Conch, pi. 220, fig. 1, 

 (non Deslong.) PL in Index 

 to ditto. 

 Height, 60 mm. Angle of spire, 65^ 



