458 CRETACEOUS GASTROPODA 
Aesopus, Gould (Proc. Bost. Soc., 1859, VII, p. 383) is said to be an inter- 
mediate form between Mitra and Columbella. 
Alcira, Adams (Proce. Zool. Soc., 1859, p. 450) differs from Columbella by 
having one distinct anterior fold on the columella which is truncated. 
XIII. Family,—BUCCINIDZ, p. 140. 
(FuUsAGEA in parte and Nassacea of Troschel). 
The family Buccrwrpz no doubt contains an assemblage of various shells, but 
if we are to follow the classification of the species of this family, as also of 
that of the Muricrpm, Corumprrtip# and others, according to the few instances 
in which the dentition of the radula has been examined, the characters of the 
shell would become worthless. I cannot believe that this kind of classification 
can be carried out so thoroughly regardless of the form of the shell, though genera 
like Neptunea are perhaps quite as much allied to Buccinwm as they are to Fusus 
or Pollia. 
b. Sub-family,—NASSINZ, p. 140. 
Tlyanassa n. gen., Stimpson (Am. Jour. Conch., I, 1865, p. 61). 
Buccitriton, Conrad, mentioned in the TRrronrps, appears to belong to this 
sub-family, at least so far as the species B. aléwm, Con., is concerned (see Am. 
Jour. Conch., I, 1865, p. 211, pl. 21, fig. 9). 
ce. Sub-family,—COMINELLIN 4, p. 141. 
Levibuccinum, Con., (Am. Jour. Conch., I, 1865, p. 211) appears to belong to 
this sub-family, if not to the ConvumBeLripzZ. 
d. Sub-family,—BUCCININ 4, p. 142. 
Genus, Buccinum—note the following ; 
Fischer and Mérch consider Volutoharpa to be a good genus, not only a sub- 
genus of Buccinum; several species are described in Jour. d. Conchiliologie, VIL; 
p. 40. 
Ptychosalpinx, Gill, 1867 (Am. Journ. Conch., III, p. 153) is allied to 
Pollia, but placed in this sub-family by its author, 
XIV. Family,—PURPURIDE. 
H. Adams proposes for Vewilla fusconigra, Pease (Proc. Zool. Soc., Lond., 
1859, p. 828) the name Usilla (ibid., p. 369). 
Galeropsis, Hupé, 1859, is a link between Coralliophila and Pedicularia ; 
G:. Lavenayanus is a fossil species (Revue et Mag. Zool., X, p. 125). 
Phychatractus, Stimpson, 1865 (Am. Journ. Conch., I, p. 59), mentioned in 
the family Fuscrozarmps, is said to be, according to its dentition, allied to species 
of this family. 
