CARBONIFEROUS FOSSILS. 385 



SYRINGOPORA (AULOPORA) sp. 

 Plate XXXVI, fig. 7. 



These reticulating creeping tubes overrun large specimens 

 of the Zaphrentis before described. Such fossils used to be 

 called Aulopora, but they are the young stoloniferous base of 

 a Syringopora. This was first suggested to us by the late 

 Professor E. Forbes, on examining the carboniferous fossils at 

 Hook Point, in Wexford, where these corals abound. It has 

 however been clearly shown to be the case by Professor Milne 

 Edwards and J. Haime in their great work on Palaeozoic 

 Corals, (Archives du Museum d'Hist. Nat. vol. v.) 



It is impossible to say to what species of Syringopora such 

 may belong, unless the full-grown coral were found with them. 

 In size and shape they agree pretty well with the young por- 

 tions of S. geniculata, so common in the English carboniferous 

 limestone. 



LOCALITY. Depot Point ; frequent (on large corals) . 



FENESTELLA ARCTICA, n. sp. 

 Plate XXXVI., fig. 8. 



Portions of foliaceous plane fronds, which must have 

 measured several inches across. The branches are thicker 

 than broad, rounded on the non-poriferous face, slightly but 

 regularly zigzag, and fully a third of a line broad ; they are 

 regularly radiating and bifurcating over the general surface ; 

 irregular, and some of them much thickened below. Fenes- 

 trules broad, oval, a line long, and fully twice the width of 

 the branches. They are very regular in size and shape, those 

 at the bifurcation of the branches being similar and equal to 

 the rest. Non-poriferous surface very finely striated, appearing 

 smooth to the eye ; pores - - ? 



As we have nothing of the poriferous face, it may seem 

 hazardous to give a name to this fossil ; it is however a large 

 and fine species, extremely regular in the disposition of the 

 branches and size of the perforations, and will be easily recog- 



