MANUAL OF THE MOLLUSCA. 
‘* Animal allied to Natica; foot small, compact without any 
posterior lobe ; the front lobe deeply sinuated; eyes subcuta- 
neous, situated at the internal base of the lobe; operculum 
terminal, few-whorled, horny, thin. 
“Shell ovate, imperforate, spire small, produced; mouth 
reversed, pear-shaped, about half the length of the shell.” 
(Moller ) 
Fossi:, species. Cretaceous. Germany, Britain. 
DESHAYESIA, Raulin, 1844 (see p. 236). 
Dedicated to M. Deshayes, author of ‘‘ Description des Ani- 
maux sans Vertébres dans le bassin de Paris,”’ &c. 
Synonym, Naticella, Grateloup (non Minster). 
Type, D. Parisiensis, Raulin. 
Shell subglobose, thick, umbilicated; spire short; aperture 
entire, semicircular, oblique ; eplanelly oblique ; callosity den: 
ticulated ; umbilicus covered by the callosity; right lip acute, 
smooth internally. 
This genus presents a very remarkable combination of the 
characters of Natica and Nerita, and appears to establish a pas- 
sage between these two genera, types of distinct families. 
Distribution, 2 species. Oligocene and Miocene. Paris and 
Bordeaux Basins 
PrycHostomA, Laube. 
Fossil, 3 species. St. Cassian. 
[FAMILY CANCELLARIDZ. | 
The genera are— 
CANCELLARIA (Admete, p. 216), TRICHOTROPIS (p. 216), 
? CERITHIOPSIS (p. 242), P SEPARATISTA, and 
PurRPupINA,* D’Orbigny, 1850 (p. 222). 
Type, Purpurina Bellona, D’Orbigny, Fig. 12. 
* Tiis genus has been the subject of careful research and revision by Messrs. 
Eugene Deslongchamps and Piette ; and I think it advisable to replace the characters _ 
of this group, given in p. 222 of the Manual, by those emended by the authors above 
mentioned, E 
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