GASTEROPODA. 



PLEUROTOMA HARPULA, Brocchi. 3rd Suppt., Tab. 1, fig. 4. 



MUREX HARPULA, Brocchi. Conch, foss. Subap., p. 421, tab. viii, fig. 12, 1814. 

 PLEUROTOMA - Phil. En. Moll. Sic., vol. ii, p. 173, 1844. 

 Fusus Risso. Hist. Nat. Europe Merid., vol. iv, p. 208, 1826. 



RAPHITOMA Bellardi. Monog. de Pleurot., p. 101, No. 22, 1847. 



Axis, 4 of an inch. 



Locality. Boyton . 



A single specimen has been sent to me for examination and illustration by Mr. Robt. 

 Bell, with Brocchi's specific name attached, and in this assignment I quite coincide. It 

 appears in shape to be intermediate between Fusus and Pleurotoma, but probably only 

 doubtfully to be entitled to the above generic position, as it seems quite destitute of the 

 " side slit " of that genus. Our shell may be described in the words of Brocchi, viz. : 

 " Testa turrita, longitudinaliter costata costis (8 9) termis, spiraliter striatis, interstitiis 

 laevigatis, anfractibus convexiusculis, apertura ovata ; cauda brevissima aperta. 



RAPHITOMA SUBMARGINATA, Bellardi. 3rd Suppt., Tab. 1, fig. 2. 



PLEUROTOMA SUB-MARGINATA, Bonelli. Cat. Mus., fide Bellardi. 

 RHAPHITOMA Bellardi. Monog. Pleurot. foss., p. 95, tab. iv, fig. 20, 



1847. 



Axis, ~ of an inch. 



Locality. Red Crag, Felixstowe. 



A single specimen, but unfortunately not quite in perfection, has been found in my 

 siftings of the Red Crag material at Felixstowe, and I have referred it as above, but my 

 dependence for so doing has been upon the description and figure by Bellardi, not 

 having a specimen of the Italian fossil for comparison. My shell appears to be some- 

 what intermediate between this and R. plicatella, but I have no doubt that it is one of 

 the very large group of fossil shells varying in some trifling degree only which connect 

 the genus Pleurotoma and Fusus, and for which I believe nearly twenty generic divisions 

 have been proposed. My shell is not far removed from Murex vulpeculus, Brocchi, and 

 Pleurotoma Maggiori, Phil., forms, which, I think, might without any impropriety be 

 specifically united. My shell measures six-tenths of an inch in length, and two-tenths 

 in its diameter, without any ridges or folds upon the columella, or any denticulations 



