1 



406 



LIOTim^. 



the more typical forms they will take the name of Del- 

 phinoidea, Brown. 



Species of Cyclostrema. 



angulata, A. Adams. 

 cancellata, Marry att. 

 cingulifera, A. Adams. 

 costulata, Miill. 

 elegantula, Phil. 

 exigua, Phil. 

 exilis, Phil. 

 Isevis, Phil. 

 micaus, A. Adams. 



nitens, Phil. 

 nitida, A. Adams. 

 nitidissima, Adavis. 

 nivea, Chem. 

 paulla, Phil. 

 Eeeveana, Hinds. 

 rota, Forbes and Hanley. 

 serpuloides, Mont. 

 sulcata, A. Adams. 



Sub-gen. ctnisca, H. and A. Adams. 



Shell depresslj turbinate ; umbilicus wide and deep, perspec- 

 tive, surrounded by a spiral callus ; whorls with transverse, 

 granular ribs ; aperture circular ; inner lip straight ; outer lip 

 thickened, lirate within, continued posteriorly on the penultimate 

 whorl beyond the inner lip. 



granulata, A. Adams. 



Sub-gen. serptjlaria, Romer (? Spira, Brown). 



Shell orbicular, discoidal, evolute ; spire depressly concave, 

 whorls rounded, disunited ; aperture circular, peritreme con- 

 tinuous. 



spirula, A. Adams. 



