74 TABULATE CORALS. 



tecting the smallest sign of these apertures by an examination 

 of the outsides of the tube with a hand-lens, though I have for 

 this purpose carefully gone over an extensive series of excel- 

 lently preserved specimens. This shows that the mere fact 

 that mural pores cannot be detected with a magnifying-glass, 

 even in calcareous examples, is not proof positive that such 

 openings are absolutely wanting. 



The corallites of F. Bowerbanki are long and slender, of 

 variable size, but usually from one-sixth to one-quarter of a 

 line in diameter. Their cross-sections (as the calices also) are 

 irregularly polygonal (PI. III., fig. 4), and in their general 

 aspect they closely resemble the corallites of Cluetetes radians, 

 Fischer, and its allies. They show a peculiarity, also, which is 

 very characteristic of the forms just alluded to (such as Chcetetes 

 septosus, Flem.) viz., that the larger tubes are not uncom- 

 monly partially subdivided by vertical partitions, which spring 

 from the wall, and extend a certain distance inwards into the 

 interior of the visceral chamber (PI. III., figs. 4, 4 a). These 

 incomplete partitions are usually placed in pairs, one opposite 

 the other, and they appear ultimately to become complete by 

 the union of their inner ends. Though they might be taken at 

 first sight as irregular septa, they really are not of this nature, 

 and they truly indicate different stages in the multiplication of 

 the older corallites by means of fission. Genuine septa, in the 

 form of vertical ridges, tubercles, or spines, such as are so com- 

 monly present in other species of Favosites, seem here to be 

 entirely absent. Lastly, the tabulse are present in the form of 

 slender curved plates, which are exceptionally few in number 

 and remote in position (PI. III., fig. 4 d), not more than two or 

 three of these structures usually occupying the space of two 

 lines. 



Formation and Locality. Abundant in the Wenlock Lime- 

 stone of Benthall Edge, Stoke-Edith, and Longhope. Also in 

 the Wenlock Limestone of Gotland. 



