ANCILLARIIN.E, HARPING. () 1 



Subfamily ANCILLARIIN^E. 



MONOPTYGMA, Lea. 



Shell with elevated spire and callous columella, the latter with a 

 snboentral conical tooth like callous projection. M. Alabamiensis, Lea 

 (PI. 3, fig. 23 1, Eocene, Alabama. 



ANCILLARIA, Lam. 



Shell oblong or subcylinarical, thick and smooth in the typical species ; 

 body-whorl usually swollen, sutures covered by enamel ; aperture broadly 

 effuse below ; columella typically not umbilicated, with a few oblique 

 anterior plaits. The revolving basal groove ends occasionally in a slight 

 anterior labral projection or tooth. The shell may be distinguished from 

 the Olives by the spire being covered with callus in the former, whilst in 

 the latter the suture is canaliculate. Ancillopsis, Conrad (A. scamba, PI. 

 3, fig. 26 ; A. altile, PI. 3, fig. 27), is a synonym of AncMaria. The types are 

 eocene fossils from Alabama. Dentition, PI. 2, figs. 15, 16. 



Subgenus OLIVDLA, Conrad. 



Shell decussated by distinct, close longitudinal and revolving striae ; 

 spire covered by a longitudinally striate callous deposit, forming a raised 

 band upon the suture of the body-whorl ; aperture posteriorly channeled. 

 Fossil only. 0. staminea, Conr., Eocene, Ala. (PI. 3, figs. 24, 25). 



Subgenus ANOLACIA. Gray. 



Shell oblong-ovate, thin ; body-whorl swollen, irregularly covered wLh 

 slight revolving striae ; spire very s'.ort, callous. 



The thinness of the shell, form of body-whorl and short shouldered 

 spire remind one of the genus Cymba. 



Subgenus DJPSACCUS, Klein. 



Shell solid, polished ; columellar lip twisted, separated from the body, 

 whorl by a tortuous fissure, opening into the umbilicus above ; outer lip 

 with a slight tooth in front. 



Subfamily HARPING. 



HARPA, Lam. 



Shell oval, the body-whorl very ventricose ; spire very short, with acute 

 apex ; whorls longitudinally plicated at intervals, the plications ending 

 in sharp points on the shoulder ; aperture oblong, large, broadly emargi- 

 nate below ; columella without folds. No operculum. Dentition, PI. 

 2, fig. 17. 



The figure, copied from Troschel, is from a young Harpa only an inch 

 in length, and the lingual ribbon is in this genus very minute compared 

 with the size of the animal. Troschel was not able to see any lateral 

 teeth, but Macdonald, who only observed them towards the posterior 

 extremity, records that they are very similar to those of Oliva. Other 

 observers have not found a trace of lingual armature, and it is possibly 

 only developed in the young animal. 



