546 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Vicksburgian (Byram marl) : Byram, Mississippi (rare) ; Woodward, Mis- 
sissippi (very rare). 
Vicksburgian (Bed Bluff clay) : 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. 
D escription . — 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. 
,, , [Peristome— 0.10 mm. _ . Lz=\. 00-0.10 mm. 
Measurements . — ^ . , . AO „ Zooecia , A on n qk 
lPeristomice=0.20 mm. lz= 0.30-0.35 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 necessary. 
Occurrence. — Upper Jacksonian (Ocala limestone) : Alachua, Florida (com- 
mon ) . 
Cotypes. — Cat. No. 64186, U.S.N.M. 
Subgenus Tubucella Canu and Bassler, 1917. 
1917. Tubucella Canu and Bassler, 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- J acksonian. 
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, voi. 3. 
p. 73, pi. 9, figs. 3-6. 
