﻿AMPHIPORA RAMOSA. 223 



main run parallel with the zooidal tubes, but frequently branch and anastomose 

 with one another. The precise appearance presented by these tubuli in thin 

 sections varies according as they are infiltrated with calcite or with oxide of iron. 

 In the latter condition — which is the one of most frequent occurrence — the tubuli 

 appear in long sections of the skeletal fibre as delicate and closely approximated 

 dark lines (Plate VIII, fig. 14), whereas in cross-sections of the fibre they appear 

 as minute dark and well-defined dots (Plate XI, fig. 5). 



Obs. — As there is only one known species of Stachyodes, and as its peculiarities 

 are exceedingly well marked and distinctive, it is unnecessary to add anything to 

 the above description. The only Stromatoporoid with which it would be possible, 

 even on a superficial examination, to confound S. verticillata is Idiostroma 

 oculatum, Nich. ; but, apart from grosser differences between the two, a thin 

 section of Stachyodes verticillata would be at once recognised by the highly 

 characteristic minute tabulation of the skeleton-fibre. 



Having examined a very large series of both German and British specimens 

 (the former collected by myself from Bargatzky's typical locality), I do not see 

 any reason to doubt the identity of Stachyodes ramosa, Barg., with the previously 

 described Stromatopora verticillata of M'Coy. It is true that M'Coy has described 

 his species from very small examples, and he states that the diameter of the stems 

 is from " one to two lines," but this is clearly a matter of little importance. The 

 stems in the British examples which I have examined never fall below a tenth of 

 an inch in diameter, and their average diameter is about three tenths of an inch, 

 but I cannot think that this is a matter of specific value. 



I have never seen an example of Stachyodes verticillata in the " Caunopora- 

 state." 



Distribution. — Stachyodes verticillata, McCoy, is a not uncommon form in the 

 Devonian Limestone of Shaldon and Teignmouth (pebbles in the Triassic con- 

 glomerates). In the German Devonians I am only acquainted with it as occur- 

 ring in the limestones of Hebborn, in the Paffrath district, where it is by no 

 means uncommon. 



Genus 2. — Amphipora, Schulz, 1882. 

 (Introduction, p. 109.) 



1. Amphipora ramosa, Phill. sp. PI. IX, figs. 1 — 4, and PI. XXIX, figs. 3 — 7. 



Caunopora ramosa, Phillips. Pala?ozoic Foss. of Cornwall, &c, p. 19, pi. viii, 



fig. 22, 1841. 



Stromatopora (Caunopora) ramosa, M'Coy. Brit. Pal. Foss., p. 67, 1851. 



