﻿STROMATOPORA INvEQUALIS. 181 



Devonian Limestone in the Triassic conglomerates of Teignmouth. S. HwpscMi, 

 var. seposita, Nich., occurs not very uncommonly at Teignmouth. 



5. Steomatopoea inmjualis, n. sp. PI. XXIV, figs. 11 and 12. 



The form, size, and surface-characters of this species are unknown, as also is 

 the mode of attachment of the organism. The mode of growth is continuous, and 

 not by latilarninas. The skeleton-fibre is thick and coarsely porous, and is woven 

 into a loose reticulation, the meshes of which are elongated and sinuous, the 

 general characters of the coenosteal tissue agreeing in all essential respects with 

 those distinctive of 8. Hupschii, Barg. . Vertical sections show that the radial 

 pillars are well developed, while numerous distinct zooidal tubes, intersected by a 

 moderately large number of transverse partitions or " tabulse," are present. The 

 astrorhizEe are exceedingly well developed, and exhibit a distinct division into 

 two series, a larger and smaller, which are regularly intermingled with one 

 another (Plate XXIV, figs. 11 and 12). The larger astrorhizas have a few 

 slightly divided branches, their centres being placed from 6 to 12 mm. apart. 

 The smaller astrorhizas consist of numerous short, hardly divided, radiating 

 canals, and occupy the interspaces between the larger ones. 



Obs. — This species is only known to me by polished specimens obtained from 

 the Devonian pebbles in the Triassic conglomerates of Teignmouth, and these 

 show nothing as to the general form or mode of attachment of the cosnosteum. 

 Moreover, almost all the specimens I have examined are in the "reversed" 

 condition, the actual skeleton being more or less extensively replaced by calcite, 

 while the astrorhizal canals and zooidal tubes are more or less completely 

 infiltrated with opaque calcareous mud. I have only obtained one specimen in 

 which the state of preservation of the skeleton is normal. This specimen shows 

 that, as regards general internal structure, there is nothing that would clearly 

 distinguish 8. insequalis, Nich., from 8. Hupschii, Barg., and it is possible that 

 the former is only a well-marked variety of the latter. The apparently constant 

 division of the astrorhizse in 8. insequalis into two series of different sizes and 

 shapes is, however, so marked a feature (Plate XXIV, figs. 11 and 12), that it 

 seems to me advisable to consider this form as a distinct species. If the character 

 in question be admitted as of specific value, then there is no other species of the 

 genus Stromatopora with which the present form could be confounded. 



Distribution. — S. insequalis is of rare occurrence in the pebbles of Devonian 

 Limestone in the Triassic conglomerates of Teignmouth. 



