456 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 

 Genus SMITTINA Norman, 1903. 



1880. Smittia HINCICS, British Marine Polyzoa, p. 340 (preoccupied). 



1903. Smittina NOBMAN, Notes on the Natural History of East Finmark, Annals and 

 Magazine Natural History, ser. 7, vol. 12, p. 120. 



In the apertura there is a lyrula and two cardelles. The frontal is an olocyst, 

 perforated laterally with areolae and supporting a granular or costulate pleurocyst. 



E. Cystisella 



F. Porella 



H. 



Bryocryptella 



G. Umbonula 

 FIG. 131. Genera of the family Sniittlnidae, Levinsen, 1909. 



A. Smittina reticiilata MacGillivray, 1842. 



B. Plagiosmittia rcgularis Canu and Bassler, 1917, X 20. Jacksonian of North Carolina. 



C. Mucronella peachi Johnston, 1847, X 50. Recent. 



D. Ramphostomclla costata Lorenz, 1886. Recent. 



E. Cystisella saccata Busk 1856, X 25. Recent. 



F. Porella cervicornis Pallas, 1766, X 20. Recent. 



G. Umbonula verrucosa Esper, X 25. Recent. 



H. Phoceana columnar is Jullien, 1913, X 10. Recent. 

 I. Bryocryptella torqitata Jullien, 1903. Recent. 



The anterior indentation of the peristome contains an avicularium very often tri- 

 angular. 13-19 tentacles. 



Genotype. Smittina (LcpraUa) reticulata MacGillivray, 1842. 



Range. Lutetian-Recent. 



The difference between Smittina and Porella appeared very difficult in the old 

 days, and the form of the avicularium was alone taken into consideration. A form 



