194 STROMBID^. 



canal produced anteriorly into a long digitation. G. tetracer, 

 d'Orb. Several species. Jurassic ; France. 



Anchura, Conr. 



Syn. — Drepanocheilus, Meek. Perissoptera, Tate, Mono" 

 dactyles, Piette. 



JDistr. — J ur., Cret.; America. Species numerous. A.abrupta, 

 Conr. (Ix, 83). A. falciformis, Grabb (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 falcate 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, H. ornata, d'Orb, (Ix, 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, 1815. Like Helicaulax, but posterior 

 canal short ; a single small, sickle-form wing, only attached to 

 the last or last two whorls. H. calcarata, Sowb. 



LispoDESTHES, White, 1875. 



Distr. — 2 sp. Cretaceous ; N. America, L. ling uif era, White 

 (Ix, 86). 



Shell fusiform ; anterior canal straight or slightly curved, and 

 more or less prodviced ; 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. 



PEREiRiEA, Crosse, 



Distr. — P. Gervaisii, Yezian (Ix, 81), 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. 



DicROLOMA, Gabb. 

 Syn. — Hemicaudes, Piette. Tridactylus, Gardner. 

 Distr. — Lias and Oolite; Europe. D. Lorieri, d'Orb. (Ix, 88). 



