S0L 
The zooecia are elliptical. In the central portion of the lateral surface 
they are arranged in longitudinal and diagonal rows (7 to 11 in the type 
specimen), with the longer diameters of the apertures parallel to the mar- 
gins. Between the longitudinal series and the edges of the branch occur 
short, less definite series, each consisting of 4 or 5 zooecia that extend up- 
ward and outward. The longer diameters of these zooecia are parallel to 
the longitudinal series of apertures in the proximate branches rising from 
the corresponding margin. 
Close set, wavy rows of tubuli are present upon the crest of the ridge 
separating the series of zooecia, and in a few cases a single one is found 
between the zoocecia within the series. In the subsolid areas their distribu- 
tion shows much less systematic arrangement. 
The longitudinal section shows clearly the bifoliate character of the 
zoarium and the presence of median tubuli. The primitive zooecial tube is 
2» mm. long, lies inclined upon the median lamina, extends upward, in- 
creases in size with age and ends abruptly by a short turn into the long 
(.7 to .S mm.) vestibule. No superior septum is developed. From one to 
four diaphragms cross some of the vestibular tubes. The intercellular space 
in the vestibule zone consists of solid tissue except in a few cases near the 
junction of the vestibule and the primitive zooecia, where diaphragm-like 
structures occur. 
This species resembles Rhinidictya mutabilis in many of its characters, 
but differs in the presence of diaphragms in the vestibular tubes. 
* Occurrence: Pierce limestone, Murfreesboro, Tennessee. 
Holotype: (98) U. S. Nat. Mus. 
Rhinidictya salemensis n. sp. Plate XIII, Figs. 4-5. The zoarium consists 
of bifoliate branches 2 mm. thick and from 5 to 10 mm. wide. The surface 
is even with small, solid, unequally distributed maculae, composed of com- 
pact sclerenchyma and radiating rows of vertical tubuli. 
The zoocial apertures are small, oval, and separated from one another 
by walls that are greater than twice the short diameter of the opening in 
thickness and traversed by a single row or an irregular band of vertical 
tubuli. The zooecia are not arranged in definite longitudinal series as in 
many Rhinidictya ; 7 to 8 occur in 2 mm. 
Median tubuli are shown in the longitudinal section. The zooecial tubes 
lie along the median laminae for only .1 to .2 mm. and then turn outward 
with a short bend and proceed nearly direct to the periphery. The inter- 
spaces in the vestibular zone are filled with solid tissue traversed with num- 
erous tubuli. No diaphragms occur in the zoocial tubes. 
Occurrence: Ridley limestone, 24% miles northwest of Salem, Ruther- 
ford County, Tennessee. 
Holotype: 245-7. Indiana University. 
Rhinidictya lebanonensis n. sp. Plate XIII, Figs. 6-7. The zoarium 
branches dichotomously. The branches are small, 2 to 2.2 mm. wide and 
5 mm. thick. The margins are celluliferous; the zoocecia in the rows near- 
est the margin are more widely spaced than in the other series. Nine to 
ten rows of zooecia are present on the lateral surfaces. 
