114 PEOCEEDIFGS OF THE NATIONAL MUSEUM vol.72 



The known recent species of the genus CystiseUa are northern. 

 The discovery of a fossil species in the Midwayan of Alabama with 

 a subtropical fauna causes us to anticipate a much larger geographic 

 distribution. We have been fortunate to discover the figured speci- 

 men in the Gulf of Mexico near New Orleans. 



This new species differs from 0. saccata Busk, 1856, in its smaller 

 apertural dimensions, in the absence of two proximal pores in the 

 avicularium cavity, in the shorter zooecium (0.80 mm. and not 1.10 

 mm.), and in the frontal avicularium occupying all the zooecial 

 width. 



We gave a summary in 1920 (p. 480, fig. 135) of our anatomical 

 knowledge of this remarkable genus. 



Occurrence. — Albatross Station D. 2387, Gulf of Mexico; 29° 24' 

 00" N.; 88° 04' 00" W.; 32 fms.; sand, gravel, broken shells. 



Holotype.—Co.t. No. 7479, U.S.N.M. 



Genus SMITTINA Norman, 1903 



SMITTINA TRISPINOSA SPATHULATA Smitt, 1873 



Plate 15, Figures 9-13; text Figure 21 



1873. Escharella jacotina var. spathulata Smitt, Floridan Bryozoa. Kongl. 

 Svenska Vetenskaps-Akademiens Handlingar, vol. 10, p. 59. pi. 10, 

 figs. 199, 200. 



1914. Smittina trispinosa Osburn, Bryozoa of the Tortugas Islands. Pub- 

 lication Carnegie Institution, Washington, No. 182, p. 208. (Local 

 bibliography.) 



Structure. — Our specimens creep over shells or sometimes are free 

 and unilamellar. Never are they arranged on large flat surfaces, so 



that their photography is quite difficult. 

 They belong to the variety spathulata 

 and we have not observed any other 

 varieties, even the other variations de- 

 scribed in the same latitudes by Osburn 

 in 1912 and 1914. This variety is itself 

 very irregular. We have figured the 

 most characteristic opercula and man- 

 dibles. 

 ^ „, ^ The lyrule and the cardelles are placed 



FlO. 21.— SMITTINA SPATHULATA SmITT, •111 p ^ 



1873. ^,£. Mandibles OF LARGE Avic- OQ the proximal border of the aper- 

 uLARiA, X 85. c. opERcyLUM, X 85. turc ) thcy are placed alove the oper- 



D. Mandible of small aviculari- ' - . . ., , ^ . 



UM, X 85 culum and remain visible on the speci- 



mens with ectocyst. The frontal is 

 granulated at the center and surrounded by many rows of areolar 

 pores. The latter are not visible at the interior, which is perfectly 

 smooth at a magnification of 25 diameters. A thick pleurocyst covers 

 the olocyst. 



