280 SUPPLEMENT 
although they have frequently proved more useful to real 
science, by making known a great number of new species. 
Those zoologists who have considered, the shells only as 
making a part of the animal, and who in general have 
diminished rather than augmented the number of genera of 
shells, we of course pass over in silence. 
As we have inserted four plates in explanation of the terms 
made use of in conchology, it becomes necessary to advert 
here to such of the references as could not be engraved on the 
coppers. 
The figures of wnivalve spiral shells include, 
1, An involute shell, with the spiral horns separate, and 
the siphon ventral. Spirula Australis (Peronii, Lam.,) Nau- 
tilis spirula, Gm. 
2. A multilocular shell, the spire invisible, siphon medial. 
3. A monolocular shell, subinvolute, columella plaited. 
Voluta musice. 
4. An involute shell, emarginated or notched, narrow 
mouthed. Oliva littorata, Lam. 
4. a. Shell without columella. Jd. 
4. b. Shell with sulcated suture. Jd. 
5. A globular shell, aperture semicircular, left edge septi- 
form. Nerita peloronta. 
6. A turriculated siphonostomatous shell; a. anterior ex- 
tremity (inf. Lin.)—b. the canal—c. right or external edge— 
d. emargination, or notch—e. posterior sinus—f. umbilical 
cleft—g. left or inner edge. Plewrotoma (Murex, Lin.) Ba- 
bylonia. 
7. A turriculated shell, columella smooth and truncated. 
Helix (Bulimus) zebra. 
8. A monolocular ampullaceous entomostomatous shell; 
a. emargination, or notch. Buccinum doliwm, Lin. (Dolium 
maculatum, Lam.) 
a a i i i i i ae 
