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ing rapidly, and bearing a row of pointed crenate lamellar 

 tubercles or spines on the angle, above which is a continuous 

 plain revolving ridge ; last whorl about two- thirds of the 

 length of the shell ; spire elevated, acuminate ; aperture 

 elongate, with two sinuses, one corresponding to the angle 

 of the whorls, and the other to the ridge above it ; canal 

 long, columella smooth. From the angle of the last whorl 

 to the end of the canal is about one half the length of the 

 shell. Length 13 mill., extreme breadth 5 mill. 



Though, on account of the keel above the angle of the 

 whorls and the corresponding sinus of the aperture, I have 

 provisionally described this little shell as a Pleurotoma, and 

 assign it as an ally to PI. 1-otata (Miocene Europe), I cannot 

 overlook its likeness to Fusns pagodus and F. echinatus. It 

 also has a striking similarity in general outline to the 

 Thatcheria mirabilis of G. P. Angas (P. Z. S. 1877, P- 5 2 9> 

 pi. liv. , f. 1), which is not, indeed, so ornate as our species, 

 and is much larger. 



Miocene, Jamaica (H. Vendryes). 



5. Purpura trinitatensis, Guppy (PI. vii., f. 17). 

 Proc. Scient. Assoc. Trinidad, 1869, p. 366. 

 Ann. and Mag. Nat. Hist., Jan. 1875, p. 50. 



Explanation of Plate VII. 



Fig. 1. Leda egregia, exterior of left valve. 



" 2. " another specimen, interior. 



" 3. Nucula crosbyana, left valve, exterior ; 3a, interior. 



" 4. Leda clara, left valve, interior. 



" 5. " illecta, right valve, exterior. 



" 6. " vitrea, right valve, interior ; magnified. 



" 7. " bisulcata, left valve, exterior ; magnified. 



" 8. " acuta, right valve, exterior; magnified. 



" 9. " packed, right valve, exterior. 



