1894.] 



MICROSCOPICAL JOURNAL. 



113 



VII. Oephalis simple. 



SECTION A. CEPIIALIS ONLY. 



27.— Family: TRIPOCALPIDA. Three radial apo- 

 physes, i. e., ribs, wings, spines, or feet. 



Three feet. Horn. Three lateral ribs. Tripocalpis. 



Three feet. Horn. No lateral ribs. Tripilidiu/n. 



28.-Family: PH^NOCALPIDA. Numerous radial 

 apopliyses. 



BASAL MOUTH OPEN. 

 Radial ribs.. Cinclo'pyranhis. 



No radial ribs. Horn. . Halicalyptra. 



No radial ribs. No horn. 



BASAL MOUTH CLOSED. 



Free columella in axis of shell cavity. 



Carpocanistrum. 



Ph(B7iocalp'is. 



29.— Family: CYRTOCALPIDA. No radial apophy- 

 ses. 



BASAL MOUTH OPEN. • 



Shell conical, dilated. Cornutella. 



Shell ovate, constricted. Horn. Archicorys. 



Shell ovate, constricted. No horn. Cyrtocalpis. 



BASAL MOUTH CLOSED. 



Horn. Halicapsa. 



