194 STROMBIDA. 
canal produced anteriorly into a long digitation. C. fetracer, 
d’Orb. Several species. Jurassic; France. 
AncuurA, Conr. 
Syn.—Drepanocheilus, Meek. Perissoptera, Tate. Mono- 
dactyles, Piette. 
Distr.—Jur., Cret.; America. Species numerous. A. abrupta, 
Conr. (Ix, 83). A. falciformis, Gabb (Ix, 84). 
Fusiform, anterior canal straight, more or less produced; no 
posterior canal; outer lip produced postero-laterally into a lobe 
or process, which is scythe-shaped, or falcate. 
The original Anchura had a faleate process, whilst that of 
Meek’s subgenus is single to the end and scythe-shaped, but a 
series of species show every gradation between the two. 
HELICAULAX, Gabb, 1868. 
Distr.—Cret.; Europe. 4H. ornata, d’Orb. (1x, 85). 
Shell like Anchura, but with a long posterior canal ascending 
the spire to near the apex, usually deflected near its extremity ; 
inner lip usually heavily incrusted,the callus sometimes extending 
some distance up the spire. 
DIMORPHOSOMA, Gardner, 1875. Like Helicaulax, but posterior 
canal short; a single small, sickle-form wing, only attached to 
the last or last two whorls. HH. calcarata, Sowb. 
LispopEsTHES, White, 1875. 
Distr.—2 sp. Cretaceous; N. America. JL. linguifera, White 
(Ix, 86). 
Shell fusiform ; anterior canal straight or slightly curved, and 
more or less produced; posterior canal extending nearly or quite 
the whole length of the spire, from near the apex of which it 
may be a little deflected ; aperture winged; wing rather large, 
bearing two processes; the posterior process spine-like or falci- 
form ; the anterior process either in the form of a lobe or tongue- 
shaped ; inner lip and spire covered with callus. 
Related to Helicaulax, Gabb, of which it may be only a 
subgenus. 
PEREIRA, Crosse. ; 
Distr.—P. Gervaisti, Vezian (1x, 87). Tertiary of Portugal. 
Whorls all coronated with spiny tubercles except the last, 
where they are replaced by a carina. Lip prolonged in front, 
thick, with two digitations. Columella and ventral portion of 
the shell covered with enamel. 
Dicrotoma, Gabb. 
Syn.—Hemicaudes, Piette. Tridactylus, Gardner. 
Distr.—Lias and Oolite; Europe. D. Loriert, d’Orb, (1x, 88). 
