FASCIOLARIID.i;. 149 



Sub-geu. ANCiLLABiA, Latiiai-ck. 



Shell thin, ventricose, striated : spire short, obtuse, suture 

 enamelled ; aperture wide. 



alba, Eien. volutella. Desk. 



torosa, Meusch. 



Sub-gen. anaulax, Roissy (Anolax, Bron.). 



Shell not polished ; spire produced, sutures covered with a 

 thick deposit of enamel; inner lip with the callus extended, 

 thick, and covering the spire. 



australis, Soiv. obtusa, Hinds. 



mamillata. Hinds. rubiginosa, Swains. 



mucronata. Sow. subulata, Reeve. 



Sub-gen. chilotygma, H. and A. Adams. 



Spire moderate, suture enamelled ; inner lip with the callus 

 produced posteriorly into a strong angular tooth. 



exigua, Soiv. 



Fam. FASCIOLARIID^. 



Teeth on lingual membrane in three series (I'l'l), the 

 central recurved, toothed at the tip, the lateral not versa- 

 tile ; lateral teeth very broad, linear, with many equal 

 teeth ; central tooth narrow, small. Mantle enclosed, with 

 a straight siphon. 



The operculum in this family is ovate-acute, with the 

 nucleus apical. 



Shell fusiform ; aperture with a straight canal in front, 

 and with plaits on the fore part of the pillar. 



