68 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
and the mandible is triangular. The avicularian chamber bears a radicular per¬ 
foration. Eleven to twelve tentacles. 
Genotype-.—Diplodidymia complicata Reuss, 1869. Range: Montian-Recent. 
A detailed study of this genus was made by Waters, 1913. The ovicell is a sac 
hanging from the opercular region; the egg evolves there until the formation of the 
larva. Reuss classified this genus in a special family. 
A . Diplodidymia B . HemiseptellaC-Corynostylus D. Verminaria 
f 
y $ 
§ 
E.Calpensia 
F. Microporina 
G.CupuIaria 
Fig. 10. —Genera of the family Calpensiidae, new family. 
A. Diplodidymia Reuss, 1869, D. complicata Reuss, 1869, X 85. Recent, Africa. (After Waters, 
1913.) 
B. Hemiseptella Levinsen, 1909, H. labiata Busk, 1884, X 12. Recent, Cape Horn. (After Waters, 
1895.) 
C. Corynostylus Canu and Bassler, 1919, C. labiatus Canu and Bassler, 1919, X 20. Miocene. 
D. Verminaria Jullien, 1888, V. oblonga Busk, 1859. Crag of England. (After Busk, 1859.) 
E. Calpensia Jullien, 1888, C. impressa Moll, 1803, X 25. Recent, Atlantic. (After Guerin- 
Ganivet.) 
F. Microporina Levinsen, 1909, M. elongata Hincks, 1880 X 25. Recent, Australia. (After 
Ilincks, 1801.) 
G. Cupularia Lamouroux, 1821. C. umbellata Defrance 1823, X 20. 
