284 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Genus PACHYSTOMARIA MacGillivray, 1895 



" Zoarium unilaminate. Zooecia broad above, narrowed below; 

 surface cribriform; apertura rounded or elliptical; peristome much 

 thickened, entire, and, as well as the portion of the zooecium imme- 

 diately below and to the sides elevated; a large triangular avicularium 

 to one side of the apertura." (MacGillivray, 1895). The zoecia 

 with salient peristome have an orbicular spiramen. 



Genotype. — Pacliystomaria parvipuncta MacGillivray, 1895. 



Range. — Miocene of Australia. 



1 



M 



D B 



nr 



Fig. 116. — Genus Cylindroporella Hincks, 1877 



A-E. Cylindroporella lubulosa Norman, 1868. A. Group of zooecia in which 

 the spiramen is placed at the base of the peristomie. B. Group of zooecia with 

 the spiramen on the peristomie. (A, B. After Hincks, 1880.) C. Details of 

 aperture, ovicell, and spiramen. D. One of the small frontal punctures, highly 

 magnified. E. Diagram of side view of cell, ovicell, and spiramen. (C-E. After 

 Osburn, 1914.) 



Genus STENOPSIS Canu and Bassler, 1927 



The ovicell is hyperstomial. The aperture is rounded-quad- 

 rangular, without cardelles. The peristomie is elongated. The 

 spiramen is broad and salient. The frontal is a tuberose tremocyst. 

 The operculum is thin, semielliptical and without muscular attach- 

 ments. Avicularia. 



Genotype. — Stenopsis (Porina) jenestrata Smitt. 1873. Recent. 



Range. — Eocene (Jacksonian). Recent. 



The known species are as follows: 



Stenopsis (Porina) fenestrata Smitt, 1873 Gulf of Mexico. 



Stenopsis cylindrica, new name = Gigantopora fenestrata Waters, 



1908) Red Sea. 



Stenopsis (Galcopsis) longicollis Canu and Bassler, 1920 Jacksonian. 



Stenopsis (Galeopsis) Cyclops Canu and Bassler, 1920 Jacksonian. 



Stenopsis (Porina) tuberculosa Maplestone, 1902 Miocene. 



Stenopsis (Cellaria) duplicata Reuss, 1847 Priabonian. 



