506 Dr. H. A. Nicholson and Mr. A. H. Foord on 



The autopores have a few remote tabulge, which in some tubes 

 are seemingly altogether absent. 



This species was originally described by one of us as Fistu- 

 lipora minor, M'Coy [loc. cit.). In point of fact it is very 

 closely allied to this species (/. e. to F. mcrustans, Phill.), 

 and differs from it only in certain minute characters. The 

 principal points which distinguish F. muscosa from F. incrus- 

 tans are the slightly smaller size of the autopores and their 

 separation from one another to a proportionately greater dis-. 

 tance than in the latter species, this last feature depending 

 upon the more extensive development of the raesopores. 

 Moreover the mesopores of F. muscosa are furnished with 

 more imperfect walls than those of F. incricstans, while the 

 autopores of the former are much more sparsely tabulate than 

 is the case in the latter. 



Formation and Locality. Rare m the Lower Carboniferous 

 Limestone, Courland, near Edinburgh [collected hy Dr. Ram- 

 say H. Traquair) . 



Fistulipora crassa, Lonsdale, sp. (PI. XV. fig. 1.) 



Heteropora crassa, Lonsdale, Sil. Syst, pi. xv. figs. 14, 14 a (1839). 



Fisttdipora crassa, Nicholson, Ann. & Mag. Nat. Hist. ser. 5, vol. xiii. 

 p. 118, pi. yii. figs. 1, 1 a, 2,2 a (1884). [Non Fistulipora crassa, 

 Eominger, Proc. Acad. Nat. Sci. PhU. p. 121 (1866).] • 



The fine specimen we have figured is from the collection of 

 the late Mr. Johnson, of Dudley. Uhe species has already 

 been described and its microscopic structure illustrated by one 

 of the writers in this journal {loc. cit.) . The small dark spots 

 upon the surface of the specimen represent the " maculee." 

 The name of Dr. E-ominger's species [loc. cit.) must now be 

 changed, and we propose for it that of Fistulijpora Romingeri. 



F. crassa is not uncommon in the Wenlock Shales at 

 Dudley, and it is found also at Benthall Edge and at Dor- 

 mington. 



Fistulipora nummuUna^ Nich. & Foord. 

 (PI. XV. figs. 2-2 c.) 



Spec. char. Corallum discoid, lenticular, concavo- or plano- 

 convex, also forming thin, irregular, crust-like expansions ; 

 sometimes the corallum rises into a conical mass, with tapering 

 margins, the central portion thus attaining a thickness greatly 

 disproportionate to that of the margins. The surface is dotted 

 over with numerous " monticules " (consisting of mesopores), 

 which are slightly raised above the general level j they were 

 doubtless more elevated originally, but have been reduced in 

 height by the attrition which the whole of the corallum has 



