816 MANUAL OF THE MOLLUSCA. 
The Bullide are animal feeders; they are said to use their 
lateral lobes for swimming. About 150 recent species have 
been described by Mr. A. Adams in Sowerby’s Thesaurus Con= 
chyliorum. Fossil species date from the lower Oolites; one ig 
found in the Aralo-Caspian formation. 
Butta, Lamarck. Bubble-shell. 
Type, B. ampulla, Pl. XIV., Fig. 6. 
Synonym, Haminea (hydatis), Leach. 
Shell oval, ventricose, convoluted, external or only partially 
invested by the animal; apex perforated; aperture longer than 
the shell, rounded at each end; lip sharp. 
Animai with a large cephalic disk, truncated in front, bilobed 
behind, the lobes laminated beneath; eyes sub-central, immersed 
or wanting; lateral lobes very large, reflected on the sides of © 
the shell, posterior lobe covering the spire; foot quadrate ; 
gizzard furnished with 3 chiton-lke plates; teeth. ? 
Bulla naucum (Atys, Montf. Alicula, Ehr. Rowania, Leach). 
Pl. XIV., Fig. 7; has the columella twisted, and the spire 
entirely concealed. 
Distribution, 50 species. In all temperate and tropical seas, 
especially on sandy bottoms, ranging from low water to 25 or 30 
fathoms. 
Fossil, 70 species. .Oolite—. South America, United States, 
Europe. 
Sub-genera ? Crypt-opthalmus (smaragdinus), Ehr. Red Sea. 
Sheil scarcely convolute, fragile, oval, convex, without spire or 
columella. Animal semi-cylindrical, head with short tentacular 
lobes, eyes small, concealed under the lateral margins of the 
head, mantle and lateral lobes enveloping the shell. 
Phaneropthaimus, A. Adams. (Xanthonella, Gray) B. lutea, 
Quoy, New Guinea. Shell oval, convex, pointed behind, 
columella margin with a curved process. Animal long, cylin- 
drical, head with short tentacular lobes, eyes in middle of disk, 
lateral lobes enveloping. 
Linteria, A. Adams (Glauconella, Gray; Smaragdinella, A. 
Adams), Bulla viridis, Rang. Pl. XIV., Fig. 8. Shell oval, 
widely open, showing the rudimentary internal spire. Animal 
with a squarish, disk-like head, eyes sessile in the centre; 
mantle not inyesting; a posterior lobe; lateral lobes enyelop- 
ing. 
AczuRA, Miller. 
Type, A. bullata, Pl. XIV., Fig. 9. 
Liymology, Akeros, horuless, 
