NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
467 
Affinities.— The presence of the very salient avicularian mucro characterizes 
quite well this species and permits us to differentiate it from the other large 
costulate species such as Smittina colum , S. grandifossa , and S. coronata. 
Occurrence. — Vicksburgian (Marianna limestone) : Salt Mountain 5 miles 
south of Jackson, Alabama (common) ; west bank of Conecuh River, Escambia 
County, Alabama (common) ; Murder Creek east of Castleburv, Conecuh County, 
Alabama (rare) ; near Claiborne, Monroe County, Alabama (common). 
Cotypes. — Cat. No. 64.300, U.S.N.M. 
SMITTINA RETICULOIDES, new species. 
Plate 96, figs. 1-9. 
Description. — The zoarium is free and bilamellar; the fronds are narrow or 
wide, flat or undulated ; the two lamellae back to back are inseparable. The 
zooecia are elongated, distinct, narrow, fusiform, separated by a thread more or 
less salient; the frontal is flat surrounded by a line of triangular areolar pores 
numerous and quite large. The apertura is semilunar with a proximal border 
somewhat convex; the peristomice is oval and irregular; the peristome is little 
salient quite wide, smooth, enlarged at the base to bear the median avicularium. 
The ovicell is globular, salient; it is formed of a small circular area perforated 
by some large pores and with a large smooth collar; it is hyperstomial, placed on 
the distal zooecia and it opens into the peristomice. The median avicularium is 
small, triangular, with pivot, the beak above; it is placed on a thickening of the 
peristome. 
M easurements. — Zooecia 
■Lz— 0.70 mm. 
Zs=0.30 mm. 
Variations. — The pleurocystal calcification is very intense and gives to the 
zooecia the most fantastic aspect sufficiently represented by figures 4, 5, 6. We 
have been successful with two tangential sections. The first (fig. 9) is taken at the 
level of the olocyst where one sees the elements irregularly grouped around the 
median axis; the areolae are large and round. The second section was made a 
little nearer the surface (fig. 8) ; it gives the construction of the interareolar 
costules, the elements of which are grouped transversely. 
Affinities. — This species is very close to the recent Smittina reticulata Mac- 
Gillivray, 1842; it differs from it in the area of the ovicell which is much smaller, 
ornamented only with some large pores and in the median avicularium which is 
much smaller and always placed on a thickening of the peristome and not on the 
frontal itself. 
It differs from the variations of Smittina telum with very small avicularia 
in the much larger number of areolae (10) and in a less zooecial width (0.30 and 
not 0.40 mm.). 
Occurrence. — Vicksburgian (“Chimney rock” of Marianna limestone): One 
mile north of Monroeville, Alabama (very common). 
Cotypes. — Cat. No. 64309, U.S.N.M. 
