292 



Occurronco: Pierce limestone: Murfrcesborn. Tennessee; Ward's Mill 

 arid Almaville, Rutherford County, Tennessee. 



■Ji'olotype : Cat. 44519 U. S. Nat. Mus. 



Paratypes : 238-22, 23, 24, 25 ; 244-8, 9, 18 ; 245-18. Indiana University. 



Hallopora florencia n. sp. Plate VIII, Figs. 3-4. Zoarinm forms subcylin- 

 drieal branches, 1.5 to .3 mm. in diameter. The surface is smooth and with- 

 out maculae. 



The zooecia are oval, thin-walled, 7 to 8 in 2 mm. and usually in contact 

 on two sides only. 



Mesopores are numerous and crossed by close-set diaphragms. 



In the axial region diaphragms are present in the zooecial tubes from the 

 proximal ends to the beginning of the decided curvature in the early sub- 

 mature region, and average one tube diameter apart. In the remaining 

 portion diaphragms are very few or absent and when present they occur 

 near the periphery. This character is known to be persistent from the 

 study of the numerous sections of separate localities and is considered 

 worthy of the recognition accorded it here. 



The zoarium of this species is similar in size to H. duniaJis, but the dia- 

 phragms in //. dnmalis occur throughout the zooecial tube. 



Occurrence: Pierce limestone, 1^4: miles southwest of Florence, Ruth- 

 erford County, Tennessee. 



Holotype: 240: 13. Indiana University. 



Family Trcmatoporidac Ulrlch. 



Zoaria ramose, incrusting or massive. The zooecial tubes in the axial 

 region are thin-walled, and usually constricted where the diaphragms oc- 

 cur ; wall thickened in the mature region ; the divisional line of contact 

 zooecia is conspicuous. Acanthopores are more or less abundant. Meso- 

 pores are usually numerous, of large size, and with apertures closed. 



The beaded form of the zooecial tubes and mesopores formed by the con- 

 strictions of the walls when diaphragms occur, the crinulation of the walls 

 in the axial region, and the general looseness and obscurity of the structure 

 are characters quite unlike that of any other family of the Integrated 

 Trepostomata. 



Genus Batostotiui Ulrioh. Genotype: Monticulipora (Heterotrypa) 

 implication Nicholson. Bastosma Ulrich, Jour. Cincinnati Soc. Nat. Hist., 

 5, 1882, p. 154. Foord, Contr. Micro-Pal. Cambro-Sil., 1883, p. 17. Miller, 

 N. A. Geol. Pal., 1889, p. 294. Ulrich, Geol. Surv. Illinois, 8, 1890, pp. 379. 

 459; Geol. Minnesota, 3, 1893, p. 288; Zittel's Textb. Pal. (Engl, ed.), 1897, 

 p. 275. Simpson, 14th Ann. Rept. State Geol. New York for 1894, 1897, p. 

 588. Niekles and Bassler, Bull. U. S. Geol. Surv., 173, 1900, p. 35. Grabau 

 and Shimer, N. A. Index Fossils, 1, 1907, p. 136. Cumings, 32d Ann. Rept. 

 Dept. Geol. Nat. Res. Indiana, 1908, p. 740. Bassler, Bull. U. S. Nat. Mus., 

 77, 1911, p. 272 ; Zittel-Eastman Textb. Pal., 1913, p. 338. 



The zoarium is ramose, branching irregularly from an expanded base. 

 The zooecial walls in the immature region are thin and irregularly flexuous. 



