228 BRITISH STROMATOPOROIDS. 



personal acquaintance is Idiostroma Boemeri, Nich., of the Devonian rocks of 

 Germany (Introduction, p. 100, Plate IX, figs. 6 — 10). From this latter species 

 the present form is at once distinguished by its slender stems, its fasciculate mode 

 of growth, the characters of its surface, and the much less complete development 

 of the zooidal tubes. 



Distribution. — Not uncommon in the Devonian Limestones of Biichel, in the 

 Paffrath district. It is also of not very rare occurrence in the Devonian Lime- 

 stones of South Devon (Teignmouth, Shaldon, &c). 



