OF CONCHOLOGY. 143 



Subfamily TEREBELLINJE. 



Tentacles none ; eyes on the ends of peduncles ; anterior 

 part of the foot small and rudimentary ; operculum narrow and 

 denticulate ; shell subulate, outer lip simple. 



Genus TEREBELLUM, Lam. 



Shell subulate, spire slightly produced or blunt ; aperture 

 narrow, notched in advance, outer lip simple, inner lip more or 

 less encrusted, columella straight and truncate. 



T. subulatum, T. convolution. 



Tertiary and recent. The oldest known species is from the 

 Eocene. 



Family APORRHAID^E. 



Lingual membrane with seven rows of teeth (3 — 1 — 3), the 

 central hooked and denticulate, first lateral uncinate, second and 

 third claw-shaped ; muzzle elongated, tapering ; tentacles subu- 

 late, bearing the eyes on slight prominences at their outer bases ; 

 mantle with the outer side expanded, lobed (or digitate ?), and 

 with a rudimentary siphon in front bending to the right. Foot 

 small, oblong, simple. Operculum annular, ovate or pointed, 

 nucleus small, apical. Shell fusiform, turrited or oblong-ovate ; 

 outer lip usually changing with age, and often expanded into 

 digitations or falciform processes. 



Subfamily APOEUTIAINJE. 



Outer margin of mantle expanded into lobes (or digitations?). 

 Operculum ovate. Shell more or less fusiform ; outer lip usually 

 expanded into long digitate or falciform processes ; anterior ca- 

 nal more or less produced. 



Genus APORRHAIS, Dillw., Auct. 

 (Non Aldrov, nee Da Costa.)* 



Shell fusiform in the adult, outer lip thickened and produced 



* Heermannsen, in his Gen. Malacoz., quotes Aldrovandi, Petiver and 

 Da Costa as the earliest authorities for this name, mentioning that the 

 first refers to Aristotle. H. and A. Adams, evidently following him. 

 quote the genus as belonging to Aldrovandi. Since they have attempted 

 in all cases to restore the oldest names, and quote the oldest authors, 

 without reference to the binomial system, they should, in justice, have 

 given Aristotle and not Aldrovandi as the author, if they quoted either. 



