]SrORTH AMERICAN LATER TERTIARY AND QUATERNARY BBYOZOA. 



63 



salient,[tLnely granular. The cryptocyst is finely porous; the opesium is irregular or 

 semilunar, a little elongate; the polypidian tube forms a rectangular surface, salient 

 and^excentric between the two dissimilar opesiular indentations. The large zooecia 

 (B) are provided with a wide distal floor, and the polypidian tube is almost median. 



Measurements. — Opesium of small (a) zooecia.. , ~„',„ „' 



^ I Zo = 0.16-0.30 mm. 



|Z2 = 0.50-0.76 mm. 



lZ2 = 0.50mm. 



I^io = 0.24-0.30 mm. 



I Zo = 0.36-0.40 mm. 



J ivt\ • |i2= 1.00-1.10 mm. 



Large (B ) zooecia , „,, „ ,„ 



^ \lz = 0.44-0.56 mm. 



Affinities. — The dimensions are quite variable, but they are always smaller than 

 those of Steganoporella magnilahris Busk, 1854, which this species resembles in all 

 its other characters. 



Small (a) zooecia. 



Opesium of large (B) zooecia.. 



A . Steganoporella B . Siphonoporella 



Fig. 7. — Genera of the family Steganoporellidae Le^^nsen, 1909. 



A. Steganoporella Smitt, 1S73. S. magyiilabris Busk, 1852. Recent. (After Harmer, 1900.) 



B. Siphonoporella Ilincks, 1880. iS. delicatissima Busk, 1840, X-10. Recent. (After Levinsen, 

 1909.) 



Occurrence. — Low'er Miocene (Bowden horizon) 

 mingo (rare) and Bowden, Jamaica (common) . 

 Cotypes.— Cat. Nos. 68485, 68486, U.S.N.M. 



Cercado de Mao, Santo Do- 



STEGANOPORELLA MAGNILABRIS Busk, 1854. 



Plate 14, figs. 12, 13. 



1854. Memhranipora magnilabris Busk, Catalogue Marine Polyzoa, British Museum, pt. 2, 



Cheilostomata, p. 62, pi. 65, fig. 4. 

 1872. Steganoporella elegans Smitt, Floridan Bryozoa, collected by Count Pourtales, Pt. I, Kongl. 



Svenska Vetenskaps-Akademiens Handlingar, vol. 10, No. 11, p. 15, pi. 4, figs. 96-101. 

 1890. Steganoporella magnilabris Harmer, A revision of the Genus Steganoporella, Quarterly 



Journal Microscopical Science, vol. 43, p. 279, pi. 12, fig. 10; pi. 31, figs. 44-46 (cites bibli 



ography). 

 1909. Steganoporella magnilabris Levinsen, Morphological and Systematic Studies on the Cheilo- 



stomatous Bryozoa, pp. 167, 168. 



