srp.-t'l.Ass [ 



A NTHOZOA TETRACORALLA 



Meek and Worth. (Fig. 110). Like the preceding, but with 

 mly one septal fossula. Devonian ; North America. 



Family 3. Zaphrentidae. Milne-Kdwards and Haime. 



Cwalla ximjili; fiirliimif'; conical, <>< o//;,/,//v<W ; .^v/" numerous, exldliiui-i 

 in <trr<ni<i< an nt. Thirii iji-Hi'i-nllii formed by fusion of 

 eveloped ; ili**-i>impnts not very abundant in inter- 



sry;//// Ix'uli. 



N/,-,-/,/, /.<,, Hall. Turbinate, often curved. Septa numerous (80-130), 

 alternately long and short; the free edges of the longer septa are 

 t \vi-trd together ' ( , /( 

 in the centre to 

 form a pseudo- 

 coluinella. Tab- 

 ulae few or 

 alismt. Posi- 



tion of the prin- 

 cipal septum is 

 ivrugnisable on 

 the exterior by 

 system of pin- 

 nately diverging 

 costal ridges. 



Common in Ordo- 

 \iriaii and Sil- 

 urian. 



FIG. 111. 



nilcnsix, Bill. Hudson River group 

 (Oi'iluviciau); Cincinnati, Ohio. l/j. A, Side vi>-\v. 

 /.', Transverse section. C, Longitudinal section, (h, Car- 

 dinal sejituin; g, counter septum ; s, alar septum.) 



f. (Figs. 111-114). Simple, turbinate, or sub -cylindrical, 



- W TIG. 114. 



r,,.. ii-j. Zdphrentis Enniskilleni, "Rich, ('ariioiiifernus Lime. 



y.<ilthi-i:nti< n,riiiii;,j,;,n; snine; Ireland. .1, /;, Transverse sections tliroiigh re- 



/"/'/" ? ", Mieh. t'ali nlar-ed. spectively upper and lower portions of calicc. ' '. A Ion- 



[..>ueiir. Dev...nian lime- ( i irl.onitVroiis Limestone; and two short septa united at the end* to form the wall. 



-tone ; ohio. Ti.urnay, Helium. D, Longitudinal section showing tabulae (after Nicholson). 



irer|iiently elongated. Calice deep, with circular margin. Septa numerous, 

 reaching to the centre ; cardinal septum in a deep fossula. Tabulae numerous, 

 somewhat irregular, and passing from side to side of the visceral chamber : 



