260 



Subgenus APICALTA, A. Adams, 1862. 



Shell solid, spire twisted with decidedly mucronated apex, 

 aperture oblong. 



Subgenus MUCRONALIA, A. Adams, 1862. 



Shell subulate, straight, often colored, pupoidal, with mu- 

 cronate apex ; aperture oval-oblong. 



The distinction between this group and Apicalia is a very 

 slight one. 



Subgenus SELMA, A. Adams, 1864. 



Shell oblong-ovate, subdiaphanous ; spire short ; last whorl 

 large ; aperture elongately ovate ; columella arcuate, obliquely 

 subplicate. 



Subgenus STYLIFERINA, A. Adams, 1860. 



Shell oval-conic, diaphanous, thin, smooth ; whorls numerous ; 

 apex mucronate, nucleus sinistral ; aperture subquadrangular. 

 Parasitic on Asteria and Ophiura. 



Subgenus LAMBERTIA, Souverbie, 1869. 



Shell pu pi form, white, very smooth, polished ; spire mucro- 

 nate, cylindrical, the summit mamillated ; whorls few ; aperture 

 semilunar, peristome continuous ; the outer lip sharp, the inner 

 lip a little reflected at the base, columella slightly twisted. 

 Operculum unknown. 



Subgenus AMAURELLA, A. Adams, 1867. 



Shell small, oval, imperforate, white*, shining, summit mamil- 

 lated ; lip and columella thick. 



Resembles Macrocheilus in miniature, and is, perhaps, more 

 nearly related to Stylifer. 



Subgenus EULIMOPSIS, Brugnone, 1880. 



A fossil group ; the base concentrically striate, whorls scarcely 

 convex, suture distinct, aperture subrhomboidal, lip sinuous, 

 columella twisted, base subchanneled. 



E. CARMEL.E, Brugn. Pliocene, Sicily. (Struct, and Syst. 

 Conch., ii, t. 68, f. 84.) 



Subgenus IOPSIS, Gabb., 1873. 



Shell very small, smooth, polished, spire elevated, suture 

 nearly obsolete, columella slightly twisted, forming an imperfect 



