192 On a new Species o/* Synocladia. 



paratini^ 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 " gcmmuliferous 

 vesicles " (?). 



Fenestrules, when the stems and branches assume their 

 normal condition, arc arcli-shaped, otherwise irregular ; mar- 

 gins not indented by cells. 



Cell-apertures arranged in two subaltcrnating rows, both on 

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

 prominent margins. 



Supplementary cell-apertu7'es scattered irregularly amongst 

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

 threes. 



GemmuUferous 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. Synodadia carhmiaria, nat. size. The dotted lines show the 

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



Fi(j. 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 ; /, gemmuliferous vesicles (?) on the keels of the 

 branches. 



Figs. 4 & 5. Reverse or non-celluliferous face, sho-^ving 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 Synodadia. The late Dr. Prout described, in the ' Trans- 

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

 above imder the name of Sepiopora cestriensis (vol. i. p. 448, pi. 

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

 racters which cannot be^^rdistinguished from those of Synodadia, 

 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 Synodadia, 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. lu framing the genus Septopora it is strange that so 



