45 
transferred the latter to Favosites. following him, Prof. H. A. Nicholson 
and the AVriter most certainly observed pores in the coral named hy us S. 
Jackii^, and believed them to exist in S. ovata, nobis (non Lonsdale). In our 
later researches, however, embracing a review of all the Australian species, 
our views with regard to the perforation of the walls in ^tenopora were much 
modified, hut we were still perplexed hy the occasional appearance of rounded 
apertures in longitudinal sections, both of S. ooata, Lonsdale, and S. australis, 
nobis, which were probably of this nature. In consequence of this we ivrote 
as follows : — “ The marked resemblances between the Stenopora and certain 
of the Monticuliporoids has led us to think that too great weight has, perhaps, 
been attached hy De Koninck, as also hy ourselves, to the value of the 
“ mural pores ” as a character of classificatory value. There can he no doubt 
that the walls of the corallites in some (and probably in all) of the species of 
Stoioporce are pierced hy irregular mural pores, and hence we have formerly 
referred the genus to the Pavositidai. In all other points except this, the 
species of Stenopora are, however, most nearly related to the Monticu- 
liporoids. . . 
It would certainly appear from the careful later researches of Messrs. 
ATaagen and ATentzel that tlie j)res3ncc of pores in Stenopora, in the sense in 
which they are generally em])loycd in the Pavositida3, cannot he upheld, and 
both Prof. Nicholson^ and the ATriter are prepared to abandon these structures 
as a distinguishing feature of the genus, leaving to future researches to 
determine the occasional appearance of mural openings in the speeies men- 
tioned above, and their regular occurrence in Stenopora Jack'll. An examina- 
tion of the tine series of S. crinita in the Mining and Geological Aluseum has 
convinced me that the walls of this species are also imj)erforate — in fact, it Avas 
the thorough investigation I was able to give tliis sj)ecies that brought home 
to me the general accuracy of Alessrs. Ai'aagen and ATentzel’s observations. 
These authors explain the rouuded apertures observed by Prof. II. A. 
Nicholson and the Arbiter liy supposing them to he, Avhen seen in longi- 
tudinal sections, “ the transverse section of some of those protul:)crances 
which have been called rudimentary septa in the Pavositidas or Cheetitidee.” 
To this I cannot subscribe, never having seen the least trace of septal 
spines, or other mural development resembling tliem, in any species of 
' Ann. Mag. Nat. Hist., 1879, IV, pp. 270 and 275. 
* Ann. Mag. Nat. Hist., 1880. XVII, p. 174. 
3 Letter dated June 4th, 1888. (Also see Manna of Palieontology, 1889, I, p. 357.) 
