304 
2 to 3 mm. apart in which the vestibular are greatly thickened and the 
zooecia less numerous than in the intermacular area. 
The zooecia are arranged into more or less definite longitudinal rows 
(183 to 14 in 2 mm.) separated by one or more rows of minute tubuli. The 
apertures at the surface are mostly elliptical (6 to 7 in 2 mm. measured 
longitudinally) with the longer diameter parallel to the direction of the 
series. In the maculae and near the non-poriferous margin the apertures 
are rounded. 
The cross-section shows a single row of median tubuli traversing the 
median laminae lengthwise. 
The zooecia in the primitive area lie inclined upward along the median 
laminae to the inferior hemiseptum. After passing the septa the zooecial 
tube turns abruptly outward, enters the vestibular area and proceeds 
almost directly to the surface. An occasional diaphragm, either straight or 
curved, occurs in some of the zooecia. 
Occurrence: Lebanon limestone; Big Springs, Rutherford County, Ten- 
nessee. 
Holotype: 248S—25. Indiana University. 
Family Stictoporellidae, Nickles and Bassler. 
This family differs from Ptylodictyonidae mainly in that the zoarium is 
not articulated, but grows upward from, and is continuous with, a spread- 
ing base. 
Genus Stictoporella Ulrich. Genotype: Stictoporella interstineta Ulrich. 
Stictoporella Ulrich, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, pp. 152, 
169. Miller, N. A. Geol. Pal., 1889, p. 325. Ulrich, Geol. Surv. Illinois, 8, 
1890, p. 394; Geol. Minnesota, 3, 1893, p. 179. Pocta, Syst. Sil. Centre 
3oheme, 8, pt. 1, 1894, p. 14. Ulrich, Zittel’s Textb. Pal. (Engl. ed.), 1896, 
p. 279. Simpson, 14th Ann. Rept. State Geol. New York for 1894, 1997, 
p. 535. Nickles and Bassler, Bull. U. 8. Geol. Surv., 173, 1900, p. 46. Gra- 
bau and Shimer, N. A. Index Fossils, 1, 1907, p. 157. Cumings, 32d Ann. 
Rept. Dept. Geol. Nat. Res. Indiana, 1908, p. 756. Bassler, Bull. U. §. 
Nat. Mus., 77, 1911, p. 127; Zittel-Eastman Textb. Pal., 1913, p. 345. 
Micropora Eichnald (not Gray, 1848), Bull. Soc. Nat. Moscow, No. 4, 
1855, p. 457; Lethaea Rossica, 1, 1860, p. 595. 
Zoarium, branching, cribose, or leaflike, from an expanded base. Zooecia 
with primitive portion tubular, usually long, generally without hemisepta, 
the inferior one only occasionally present. Apertures at the bottom of a 
wide, sloping vestibule. Thick-walled mesopores, with true diaphragms 
wanting occur between the apertures and line the margin of the zoarium. 
Stictoporella cribrilina n. sp. Plate XIV, Figs. 4-7. Zoarium consists of 
a cribrose, bifloliate expansion from an extended base. The anastomosing 
branches average .7 mm. in thickness and .5 to 1 mm. in width. The fenest- 
rules are small oval openings .75 to 1.5 mm. in greatest diameter and irregu- 
larly distributed. 
