FUSID^. 129 



Shell short fusiform, spire and canal moderate, body-whorl 

 rather large, shouldered and tuberculate, aperture channeled 

 behind, outer lip dentate within. 



Professor Meek (Pal. Hayden's Survey., ix, 344) states that 

 the fossil species described by Conrad, are not congeneric with 

 the type, the recent Fusus afer, Lam., and he refers them to 

 Conrad's genus Pja-ifusus, one of the forms of Neptuniinse. 



Clavella, Swainson. 



Syn. — Clavellithes, Swn. Cyrtalus, Hinds. Triumphis, Gray. 

 Peistocheilus, Meek. 



Dist7\ — C. serotina, Hds. (xlvii, 83). Marquesas Is. Fossil. 

 Cretaceous ; Missouri. 



Shell solid, thick, subfusiform ; spire acuminate; last whorl 

 suddenly contracted in front, thickened and rounded next the 

 suture ; aperture narrow, canal long and straight ; columella 

 excavated in the middle ; outer lip simple. Operculum ovate ; 

 nucleus apical. Dentition, unknown. 



Only one recent species can be referred properly to this fossil 

 genus, which is the C. serotina, the type of Hinds' genus Cyr- 

 tulus. The three other recent species referred to it by H. and 

 A. Adams are members of other genera : C. avellana, Reeve, is 

 a Cronia. C. distorta, Reeve, belongs to the Pisaniinse. C. sub- 

 rostrata, Grsiy, belongs to the Melongeniinge. 



Peistocheilus, Meek, described as a subgenus of Fasciolaria, 

 appears to be identical with Clavella, as Meek himself subse- 

 quently suspected. The columellar plaits are nearly obsolete, 

 situated so far within the aperture as to be barely visible and in 

 many specimens are not seen at all. C. Scarboroughi, Meek and 

 Hayden (xlviii, 1, 2). Clavella itself occasionally shows these 

 adventitious and inconspictious plaits. The shell is so decidedly 

 fusiform that I place it in the Pusinse in preference to the Fas- 

 ciolariinae despite these folds. 



Btjccinopusus, Conrad. 



Syn. — Boreofusvis, Sars. Troschelia, Morch, 18*76. 



Distr. — 2 sp. North Sea, Spitzbergen. B. Be7^niciensis, King 

 (xlvii, 84). Fossil. Miocene ; IT. S. 



Shell ventricose, spirally sculptured ; epidermis pilose ; spire 

 produced ; canal moderate in length ; columella smooth. The 

 tji'pe of this genus is a Miocene fossil, B. parilis, Conr. 



The dentition, only, separates this from Sipho, several species 

 of which might be regarded as either indentical, or varieties at 

 most. 



Jeffreys thus describes the animal: Body white or cream-color, 

 with a slight tinge of flesh-color ; mantle sometimes edged with 

 brown ; pallial tube extensile, occasionally protruded beyond the 



