192 SYNOPSIS OF THE CHARACTERS OF THE 



Favosites fibrosa. Gold. sp. 



Calamopora fibrosa. Gold. Var. a. — Favosites fibrosa. Lonsd. Sil. Syst Favosites fibrosa. Phil. Pal. Fos. 



Sp. Ch. — Branching; formed of very fine, lengthened, polygonal tubes, not flexuous, connected by tubuli 

 on the angles. 



This species is very common ; it is variously branched, the termination of the branches being obtusely 

 rounded ; the tubes are much longer and straighter than in the F. sjmngites or F. septosus, they are also finer. 



Favosites Gothlandica. Lam. 



Favosites Gothlandica. Lam. Anim. Sans. Vert — Calamopora Gothlandica. Gold. Petref. — Favosites Gothlandica. Lonsd. 



Sil. Syst. 



Sp. Ch. — Polymorphous, composed of pentagonal or hexagonal tubes, the sides of which have one or two 

 rows of minute, connecting foramina, transverse septa at irregular distances. 



The size of the tubes, number of angles, and number of pores vary considerably in this species, as also 

 the form of the general mass ; the usual diameter of the tubes is about one line. 



Favosites (?) megastoma. Phil sp. 



Calamopora megastoma. PIiU. Geol. York. 



Sp. Ch. — Incrusting, discoid; cells very large, polygonal or rounded, with strong, radiating, internal striae; 

 numerous connecting foramina at their edsfes. 



This species forms discoid, convex masses, often of considerable size; the cells are large, regular, and with 

 rather thick walls ; the lateral perforations generally very distinct. Cells usually five lines in diameter. 



Favosites (?) parasitica. Phil. sp. 



Calamopora parasitica. Phil. Geol. York. 



Sp. Ch. — Incrusting; cells very irregular in shape and size; their sides irregularly perforated. 



This species differs chiefly from the C. megastoma, Phil., in the small size and irregular shape of the cells; 

 the lateral perforations are few, very minute and far apart ; the tubes composing the cells are also longer in pro- 

 portion, and the cells deeper than in that species. Cells usually about one line and a half in diameter. 



Favosites polymorpha. Oold. sp. 



Calamopora polymorpha. Gold. Pet Favosites polymorpha — Lonsd. Sil. Syst Favosites polymorpha. Phil. Pal. Fos. 



Sp. Ch. — Branched, composed of numerous large tubes externally polygonal, internally cylindrical; con- 

 nected by alternating tubuli ; tubes about one-third of a line in diameter. 



This is rather a rare coral, but casts of it occasionally occur, shewing the peculiar branched form, and 

 the impressions of the large openings of the tubes. Diameter of the branches usually from half to two-thirds 

 of an inch. 



Favosites septosus. Flem. 



Favosites septosus. Flem. Brit. Anim. 



Sp. Ch. — Hemispherical, forming a thick, flattened crust, composed of rather coarse, slightly flexuous, poly- 

 gonal tubes, in which the transverse septa are irregularly placed. 



This species approaches very nearly to the F. sponr/ites of the Silurian rocks, but it is, perhaps, safer to 

 leave them distinct in the present state of our information on the species. The greater size of the tubes and 



