190 SYNOPSIS OF THE CHARACTERS OF THE 



Syringopora geniculata. Phil. 



Syringopora geniculata. Phil. Geol. York. 



Sp. Ch. — Tubes round, branching, irregularly flexuous or geniculated, wrinkled across, united by very 

 numerous, short, transverse tubuli. 



This curious species is remarkable for the frequent short bendings of the tubes ; the connecting tubuli are 

 numerous, and at the origin of each the tube is angularly bent ; this occurring so frequently, and at such short 

 intervals, gives an irregularity to the tubes which is very characteristic. This species forms masses, frequently 

 of great extent. The tubes are about one line in diameter. 



Syringopora lax a. Phil. 



Syringopora laxa. Phil. Geol. York. 



Sp. Ch. — Tubes tliick, straight, occasionally branched, adhering without connecting tubuli. 



This singular species has not, I believe, been yet figured ; it forms bundles of considerable size, but I have 

 not seen the transverse tubuli in any specimens which have come under my examination ; the tubes are nearly 

 straight. Diameter of tubes one line and a half. 



Syringopora ramulosa. Gold. 



Syringopora ramulosa. Gold. Pet. — Syringopora ramulosa. Phil. Geol. York. 



Sp. Ch. — Tubes slightly flexuous, nearly parallel; tubuli alternating at very unequal distances. 

 In this species the tubes are nearly smooth, rather distant, and connected by irregular, transverse tubuli. 

 Diameter of the tubes one line. 



Aulopora. 



Gen. Ch. — Parasitic; cells tubular, cyhndrical; united at the extremities, irregularly branching. 



Aulopora CAMP ANULATA. M'Coy. (PL XXVI. fig. 15). 



Sp. Ch. — Incrusting; tubes short, conical, expanding to a very wide, bell-shaped mouth. 



The singularly large, bell-shaped mouth of the tubes distinguishes this handsome species from any other 

 with which I am acquainted ; it is usually found parasitic on the Orthis crenistria. Diameter of tubes at 

 mouth one line. 



Aulopora gigas. M'Coy. (PL XXVII. fig. 14) 



Sp. Ch. — Repent; tubes cylindrical, forming a very open, irregular .net- work ; ostiolae distant, circular, 

 erect ; diameter of the tubes one line. 



This coral greatly resembles the Silurian A. serpens, but Is much larger and more loosely branched ; the 

 specimen figured is attached to a cylindrical TurbinoUa. 



Manon cribrosum. Gold. ? 



Manon cribrosum. Gold. Pet. ? — Manon cribrosum. Phil. Pal. Fos. ? 



One or two small and very obscure fragments of a coral have occurred allied to this species, but much 

 smaller in its details than any of the published figures; if it varies as much in size as the Porites pyriformis, 

 they may be of the same species. It Is, however, a doubtful reference. 



