546 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Vick=burgian (Byram marl) : Byram, Mississippi (rare) ; Woodward, Mis- 

 sissippi (very rare). 



Vicksburgian (Red Bluff cla}') : Seven and one-half miles from Bladon Springs, 

 Alabama (rare) ; near Claiborne. Monroe County, Alabama (rare) ; 2 miles north 

 of Millry, Washington County, Alabama (rare) ; Vicksburg, Mississippi (very rare 

 in the lower beds) ; deep well, Escambia County, Alabama. 



Cotypes. Cat. No. 64314, U.S.N.M. 



TUBUCELLARIA NODIFERA, new species. 



Plate 70, figs. 11-17. 



Description. The zoarium is articulated and formed of rather long cylindrical 

 segments. The zooecia are very elongated, distinct, fusiform; their frontal is 

 convex and ornamented with polygonal pores ; the peristomiale is not separated from 

 the frontal. The peristome is salient, thin, disposed obliquely on the segment. The 

 ascopore is large and placed on the frontal ; it opens into the zooecia. Certain 

 verticells of zooecia present a very salient, extremely nodose frontal, which charac- 

 terizes the species. 



,, fPeristome=0.10 mm. . Zz= 1.00-0.10 mm. 



Measurements. ,, . , . Zoowia -, n OA no - 



!Peristomice=0.20 mm. fe=0.30-0.3o mm. 



Affinities. The nodosities which ornament the segments of this species are 

 quite original ; they result from the considerable growth of the tubules over the 

 ascopore (fig. 16). Probably on account of equilibrium there are always two series 

 of nodose verticells to each segment (fig. 14) ; the three thick upper zooecia are 

 placed in quincunx with the three thick lower zooecia. These verticells have not 

 always exactly the same volume (fig. 12). We can hardly conceive what particular 

 adaptation could correspond to this special arrangement. 



No fossil or living species presents the peculiar character of this species and 

 comparisons are therefore not necessai'y. 



Occurrence. Upper Jacksonian (Ocala limestone) : Alachua, Florida (com- 

 mon ) . 



Cotypes. Cat. No. 64186, U.S.N.M. 



Subgenus TUBUCELLA Canu and Bassler, 1917. 



1017. TubuceUa CANU and BASSLEB, Synopsis of American Early Tertiary Cheilostoine 

 Bryozoa, Bulletin 96, United States National Museum, p. 62. 



The zoarium is free, bilamellar, firmly attached, rigid. The avicularia are 

 very rare. The peristomiale is equal to the frontal. 



Genotype. Tubucella (Eschara) mammillaris Milne-Edwards. 1836. 1 



Range. Lutetian- Jacksonian. 



The articulation is not a function; it is a mode of adaptation on a mobile 

 substratum. We are, therefore, not able to consider the nonarticulated species as 



1 1908. Canu, Bryozoa of Tertiary formations of the environs of Paris, Annales de Paleontologie, vol. 3. 

 p. 73, pi. 9. figs. 3-6. 



