174 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
GENERA OE MEMBRANIPORAE UNREPRESENTED. 
For the sake of completeness, definitions and illustrations of the remaining 
genera of this group are introduced below, even though fossil representatives of 
them have not yet been found in the American Tertiary. 
A. Cauloramphus 
B. Foveolaria C. iVlembrostega 
Fig. 41. — Miscellaneous genera of Membraniporae. 
D. Antropora 
A. Cauloramphus spinifer Norman, 1903, X 25. Recent. 
B. Foveolaria elliptica Busk, 1884, X 25. Recent. 
C. Memhrostega ferox Kirkpatrick, 1890, X 30. Recent. 
D. Antropora granulifera Hindis, 1880, X 30. Recent. 
Genus CAULORAMPHUS Norman, 1903. 
1903. Cauloramphus Norman, Natural History of East Finmark, Annals and Magazine 
Natural History, ser. 7, vol. 11, p. 587. 
Fig. 42. — Genus Cauloramphus Norman, 1903. 
A-C. Cauloramphus spinifer Jolinston, 1832. A. Zooecia, X 25, showing the stout spines. 
B. Three views of the pedunculate avicularia. (A, B after Hincks, 1880.) C. Sketch showing 
dietellae. (After Norman, 1903.) 
Front wall entirely membranous, the calcareous border bearing spines. Avic- 
ularia stalked and situated among the spines on the lateral margin of the zooecium ; 
ovicell, when present, very shallow and inconspicuous. Dietellae in the type, 
