68 



BUIXETIN 125, U^ilTED STATES NATIONAL MUSEUM. 



and the mandible is triangular. The avicularian chamber bears a radicular per- 

 foration. Eleven to twelve tentacles. 



Genotype. — Diflodidymia complicata Reuss, 1869. Range: Montian-Recent. 



A detailed study of this genus was made by Waters, 191.3. 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. 



W 



'f 





J' ill 



A. Diplodidymia B. HeniiseptellaC-Co''ynosty]us D.\'erminaria 



E.Calpensia 



F. Microporina 



G.CupuIaria 



Fig. 10.— Genera of the family Calpensiidae, new family. 



A. Diplodidyvna Reuss, 1869, D. complicata Reuss, 1869, X 8.5. Recent, Africa. (After Waters 

 1913.) 



B. Hemiscptclla Levinsen, 1909, //. /aWnta Busk, 1884, X 12. Recent, Cape Horn. (After Waters, 

 1895.) 



C. Corynoslijliis Canu and Bassler, 1919, C. labiatus Canu and Bassler, 1919, X 20. Miocene. 



D. yerwinana Jullien, 1888, F. o6ion9a Busk, 1859. Crag of England. (After Busk 1859) 



E. Calpensia Jullien, 1888, C. iwprcssa Moll, 1803, X 25. Recent, Atlantic. (After Guerin- 

 Ganivet.) 



F. Microponna Le^^n8en, 1909, .V. elongata Hincks, 1880 X 25. Recent, Australia. (After 

 Hincks, 1801.) 



G. Cupularia Lamouroux, 1821. C. umheUata Defrance 1823, X 20. 



