210 THE AMERICAN MONTHLY [July, 



Four feet Stephanium 



Stephaniscus should be inserted after Cortiniscus {same page) and the Key 

 should read : — 



Four basal feet Stephaniscus 



123. TEIPOCALPIS. 



Shell about as long as broad; apical horn scarcely one fourth as long 



as shell galea 



Shell 1 1-2 times as long as broad ; apical horn half as long as shell . tricostata 



124. TEIPILIDIUM. 



Shell elongate ; about 30 longitudinal rows of small pores elongatum 



125. CINCLOPYRAMIS. 



Shell with 6 ribs, connected by 12-16 complete rings oribellum 



Shell with 12 ribs, connected by 12-15 interrupted rings lithosestrum 



126. HALICALYPTRA. 



Six feet, 1 -2 as long as the shell virginica 



Six feet, as long as the shell, with dentate edges campanula 



Six feet, 2-3 times as long as the shell ampulla 



Nine feet, about as long as the shell novena 



127. CAKPOCANISTEUM. 



Shell large, with 40-50 pores on its greatest breadth , giganteum 



128. PH^NOCAIvPIS. 



Shell subspherical, smooth ; 6 feet ocellata 



Shell campanulate, rough ; 9 feet carinata 



Shell campanulate, smooth ; 12-15 feet flabellum 



129. CORNUTELLA. 



Shell slender, conical ; pores nearly square stiligera 



Shell wide, conical or funnel-shaped ; pores circular in about 9-12 lon- 

 gitudinal rows circularis 



Shell -wide, campanulate ; pores circular, not in rows mitra 



Shell wide, conical ; pores circular in 12-15 longitudinal rows clathrata 



130. AECHICORYS. 



Shell nearly spherical ; pores separated by spiuulate frames globosa 



131. CYRTOCALPIS. 



Shell ovate ; pores perpendicularly perforating the wall compacta 



Shell nearly cylindrical ; pores obliquely perforating the wall lithomitra 



132. HALICAPSA. 



Shell tuberculate ; pores of different sizes prunoides 



