434 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Occurrence . — -Vicksburgian (Marianna limestone) : West bank of Conecuh 
River, Escambia County, Alabama (very common) ; near Claiborne, Monroe 
County, Alabama (rare). 
Cotypes.— Cat. No. 62593, U.S.N.M. 
Genus ENOPLOSTOMELLA Canu and Bassler, 1917. 
1917. Enoplostomella Canu and Basst.ee, Synopsis of American Early Tertiary Cheilostome 
Bryozoa Bulletin 96, United States National Museum, p. 46. 
The apertura and peristomice of the ovicelled zooecia are identical with the 
apertura and with the peristomice of the ordinary zooecia. The frontal is a 
tremocyst with wide-mouthed tubules. The ovicell does not entirely surround the 
peristomice. There is an avicularium in the peristomie in the immediate vicinity 
of the peristomice. 
Genotype. — Enoplostomella deftxa Canu and Bassler. 1917. 
Range . — Jacksonian, Vicksburgian. 
ENOPLOSTOMELLA SYNTHETICA, new species. 
Plate 90, figs. 1-9. 
Description . — The zoarium is free, formed of from 2 to 4 lamellae, back to 
back, and separable. The zooecia are indistinct and irregular (exteriorly) ; the 
frontal is formed of a tremocyst with very large wide-mouthed tubules superposed 
on a thin olocyst perforated with small pores. The apertura (in the interior) is 
semilunar with a concave proximal border; the peristomie is very deep; the 
peristomice is orbicular, imbedded, with a wide and short rimule-spiramen limited 
by the peristomial avicularium. The ovicell is hyperstomial, much imbedded, little 
salient covered also with large tremocystal pores ; it opens into the peristomie. In 
each peristomie there is a small triangular avicularium, little visible externally. 
On the frontal, laterally a small or very large avicularium is formed by the 
coalescence of the tubules. 
Measurements. — Apertura |Aa=0.15-0.l7 mm. „ . \Lz= 0.80-0.90 mm. 
(interior) \Za=0.16 mm. ooecia 35-0.50 mm. 
Variations. — The function and transformation of the tubules give to this 
species a disconcerting aspect of irregularity, augmented still more by the orienta- 
tion of the zooecia, which is not constant (figs. 2, 3). The interior aspect (figs. 
4, 5, 8) shows, on the contrary, a more simple organization. Through the thinness 
of the olocyst, perforated with small pores, the tubules regularly placed in 
quincunx can be seen ; the frontal avicularium is visible only if it is very large. 
The development of the buds of the endocyst and the result of their coalescence 
form here a very remarkable synthesis. The buds, revealed by the very similar 
openings of the olocyst become transformed into adventitious organs more or less 
complicated, which engender small simple avicularia with pivot, some avicularian 
cavities and large avicularia with or without pivot, in which the mandibles ought 
