PERFORATING BODIES FROM LOWER PALAEOZOIC ROCKS — ETHERIDGE. 123 



of the microscopic sections wherever the chains occur, and often 

 well into the sections, among the viscaral chambers of the coral, 

 a brown pulverulent substance occurs, always very uniform in 

 colour ; does this represent the shed contents of the black globules'? 



The longest chain observed attained a length of '5 millimetres, 

 the diameter of the monillse being "0075 millimetres, and that of 

 the black globules '01. 



The second form contained within the tissues of the Favosites 

 consists of ramifying tortuous tubes, with definite walls, spreading 

 out, returning on their own parts, bifurcating, or forming confused 

 masses (PI. xxiii., fig. 5), They may be filled with a sherry-yellow, 

 minutely pulverulent matter, or, they may be quite clear of this sub- 

 stance, and only determinable by the presence of the bounding walls, 

 not otherwise differing from the surrounding calcite of the coral, but 

 the outline is very irregular, irrespective of their contorted course. 

 In the majority of instances when these tubes are present, the old 

 visceral chambers of the Favosites near at hand are more or less 

 filled with the sherry-yellow pulverulent matter. This material 

 is remarkably like that seen in the perforations of Paheachlya 

 perforans,* and which Duncan calls tubes "with conidia." In a 

 very few instances I have observed these tubes occupied by patches 

 of dense black matter, similar to the black globular cells of the 

 previously described form. The tortuous nature of this endophyte 

 renders it impossible to speak with any degree of certainty as to 

 the length of an individual tube, but the diameter appears to be 

 tolerably uniform, viz., -01 millimetres. 



I propose to call this organism Palceachlya torquis, on account 

 of its much more irregular course. It is otherwise similar in 

 character to, except for smaller dimensions as compared with 

 those of P. tortuosa, mihi. P. torttiosa is distinctly visible 

 with a one-inch objective (Watson's), whereas the tubes in P. 

 torquis cannot be distinguished without the aid of the quarter- 

 inch objective of the same maker. The diameter of the tubes in 

 P. tortuosa is "02 millimetres. 



Similar characters separate P. torquis from the endophyte 

 figured, but not named, by Waagen and Wentzel,! in the corallites 

 of Geinitziella colurnnaris, Schl. Duncan's illustrations of 

 Palceachlya per/orans convey, in a general way, the appearance of 

 the tubes in P. torquis, allowing for the much more irregular 

 course of them in the latter, and it may legitimately be concluded 

 that, although allied, they are distinct. 



As regards the chains of monilliform cells, the probability seems 

 to be that they, and the tubes of P. torquis, represent separate 



* Quart. Journ. Geol. Soc, xxxii., 1876, pi. xvi., fig. 5. 



t Pal. Indica, Ser. xiii., Salt Range Fossils, i., 6, 1886, pi. cxv., fig. 1. 



