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Bulletin 35 
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Page ijg 
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 all)- to PI. rotata (Miocene Europe), I cannot 
overlook its likeness to Ftisus pagodus and F. echinatus. It 
also has a striking similarity in general outline to the 
Thatche 7 ia mirabilts of G. F. Angas (P. Z. S. 1877, p. 529, 
pi. liv. , f. i), which is not, indeed, so ornate as our species, 
and is much larger. 
Miocene, Jamaica (H. Vendrjes). 
5. Purptira Fbiitatensis, Guppy (PI. vii., f. 17). 
Proc. Scient. Assoc. Trinidad, 1869, p. 366. 
Ann. and Mag. Nat. Hist., Jan. 1875, p. 50. 
Expl.\x.\tion of Plate VII. 
Fig. 
1. Leda egregia, exterior of left valve. 
2. “ another specimen, interior. 
3. Nucula crosbyana, left valve, exterior ; 3^, 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. “ packeri, right valve, exterior. 
