192 On a new Species of Synocladia. 



parating the two rows of cell-apertures ; those on the stems 

 rounded, those on the branches slightly angular ; both bear 

 the wart -like bodies termed by King " gemmuliferous 

 vesicles " (?). 



Fenestrules, when the stems and branches assume their 

 normal condition, are arch-shaped, otherwise irregular ; mar- 

 gins not indented by cells. 



Cell-apertures arranged in two subalternating rows, both on 

 the stems and branches, separated by the median keel ; with 

 prominent margins. 



Supplementary cell-apertures scattered irregularly amongst 

 the primary cell-apertures, either singly or in twos and 

 threes. 



Gemmuliferous vesicles (?) open node-like protuberances 

 placed on the keels of both stems and branches, alternating 

 with the cell-apertures. # 



Reverse or non-celluliferous face regularly and finely striate, 

 or rather granulo-striate ; scattered at random over the sur- 

 face are open wart-like projections, which may be the broken 

 bases of the " root-like processes " of King. 



EXPLANATION OF PLATE X. 



Fig. 1. Synocladia carbonaria, nat. size. The dotted lines show the 

 extent of the specimen and direction of the stems and branches. 



Fig. 2. Portion of a specimen, showing the celluliferous face : (a) the cell- 

 apertures, and indistinctly the keel (d). 



Fig. 3. Portion of another specimen, showing the celluliferous face, on 

 which are seen : — a. cell-apertures ; b, gemmuliferous vesicles ; 

 c, smaller cellule apertures ; d, median keel ; e, the same on the 

 branches; f, gemmuliferous vesicles (?) on the keels of the 

 branches. 



Figs. 4 & 5. Reverse or non-celluliferous face, showing the arch-like 

 dissepiments and the bases of the root-like appendages (?). 

 Figs. 2 to 5 are all very considerably enlarged. 



Note. Since writing the above I have submitted the facts mentioned 

 in the foregoing remarks to Prof. King, who considers this to be a 

 species of Synocladia. The late Dr. Prout described, in the ' Trans- 

 actions of the Academy of St. Louis,' a form very similar to the 

 above under the name of Septopora cestriensis (vol. i. p. 448, pi. 

 xviii. fig. 2). Dr. Prout established the genus Septopora on cha- 

 racters which cannot be distinguished from those of Synocladia, 

 King, with this exception, that the cell-apertures on the interstices 

 are in from one to four rows ; whereas, so far as I can ascertain 

 from Prof. King's description and figures of Synocladia, there never 

 appear to be more than two rows in the latter genus. This could 

 scarcely be construed into a generic difference, but may be regarded 

 as specific only. In framing the genus Septopora it is strange that so 



