GASTEROPODA. 211 
the anterior canal. Lingual teeth (S. floridus) 7 cusped ; uncini, 
1 tri-dentate, 2, 3 claw-shaped, simple (Fig. 77).* 
Fig. 77. Strombus. (Wilton). 
Strombus (floridus) is described by Loyén as haying a non- 
retractile, produced muzzle, like Aporrhais. 8. gibberulus is 
represented by Dr. Bergh with all the uncini denticulated. 
Distribution, 65 species. West Indies, Mediterranean, Red 
Sea, India, Mauritius, China, New Zealand, Pacific, West 
America. On reefs, at low water, and ranging to 10 fathoms. 
Fossil, 5 cretaceous species; 3 species Miocene—. South 
Europe. There is a group of small shells in the eocene tertiary 
strata of England and France, nearly related to the living 
S. jissurellus, L., some of which have been placed with rostel- 
laria, because the notch in the outer lip is small or obsolete. 
They probably constitute a sub-genus, to which the name 
Rimella Ag., might be applied. Hxample, 8. Bartonensis. Pl. 
£Y., Fig. 2. 
The fountain-shell of the West Indies, S. gigas, L., is one of 
the largest living shells, weighing sometimes four or five pounds; 
its apex and spines are filled up with solid shell as it becomes 
old. Immense quantities are annually imported from the 
Bahamas for the manufacture of cameos, and for the porcelain 
works; 300,000 were brought to Liverpool alone in the year 
1850. (Mr. Archer.) 
PTEROCERAS, Lam. Scorpion shell. 
Etymology, pteron, a wing, and ceras, a horn. 
Type, P. lambis. Pl. IV., Fig. 3. 
Shell like strombus when young ; outer lip of the adult pro- 
duced into several long claws, one of them close to the spire, 
and forming a posterior canal. 
Distribution, 12 species. India, China. 
* The lingual dentition of strombus resembles that of aporrhazs, and is unlike that 
of the whelks; but it is more probable that aporrhais is the representative of strombus 
than that it is very closely allied. 
