STEEPTOCHETUS. 137 



G. 4288. A specimen liaving strong spiral ridges, longitudinal 

 costoB being suppressed. Presented hy John Dennant, J^.sq. 



G. 9469. A series exhibiting stages of growth ; the largest 

 specimen is finely costate, and one of the others, apparently a 

 monstrosity, is bent or twisted in its length and slightly cancellate. 



Purchased. 



Genus STREPTOCHETUS, Cossmann. 

 [Ann. Soc. Eoy. Malac. Belg. t. xxiv. 1889, p. 170.] 



Shell fusiform ; with an obtuse protoconch ; ornamented by 

 nodose costse ; aperture shorter than the spire ; canal twisted, 

 rather long; columella excavated, inflected in front, often carrying 

 oblique plications, one of which is more salient than the others ; 

 outer margin slightly sinuous, not crenulated. 



It is distinguished from Latirus by its more simple ornamenta- 

 tion, by the columella, its outer margin not being crenulated, and 

 by the protoconch, which is analogous to that of Clavella. 



Type. — Fusus intortus, Lamarck. 



Streptochetus exilis, Tate (sp.). 



1888. Fasciolaria exilis, Tate, Trans. Eoy. Soc. South Anst. vol. x. p. 149, 



pi. X. fig. 3. 

 1893. Fasciolaria exilis, Tate and Denuant, id. vol. xvii. pt. 1, p. 219. 



Shell fusiform, elongate ; spire acuminate, protoconch composed 

 of two smooth, elevated, convex turns, faintly costate in front ; 

 wliorls flatly convex, longitudinally obtusely plicate, and crossed 

 spirally by bold thread-like lineations of varying size ; eostse about 

 eight in number on the penultimate whorl of the adult ; body- 

 wliorl gradually descending to the long tapering canal ; aperture 

 elongate, broadly opened in front; outer margin simple, except 

 for the intersection of the spiral ornament, which renders it slightly 

 sinuous ; columella concave, and with two or three small oblique 

 plaits, only one of which is very prominent. 



Professor Tate describes the aperture as being lirate within, 

 wliich may be characteristic of the adult, but the specimens in 

 the Museum collection are quite smooth. The species is like 



