the Genus Stenopora, Lonsdale. 



181 



Stenopora Jackii^ Nich. & Eth., Jun. 



Stenopora Jackii, Nich. & Eth., Juu., Ann. & Mag. Nat. Hist. 1879, 

 vol. iv. p. 275, woodcut, fig. 1. 



Ohs. It is unnecessary for us to repeat the description of 

 this form, as we have nothing fresh to add to the characters 

 which we have previously (loc. cit.) given of it. We have 

 examined some further material ; but as the state of preser- 

 vation of all the specimens we have seen is such as to forbid 

 the preparation of thin sections, we have acquired no new 

 knowledge as to its structure. The species is distinguished 

 by the small size of its stems, the minuteness of the corallites, 

 and the narrow and ring-like annulations of the tubes in the 

 peripheral region of the corallum. It is also remarkable for 

 the distinctness with which it exhibits minute irregularly 

 distributed mural pores. 



Formation and Locality . Permo-Carboniferous, Coral Creek, 

 Bowen-Kiver Coal-field, North Queensland. {Coll. Geol. 

 Survey, Queensland, and Brit. Mus.) 



Stenopora informis^ Lonsdale. 



Stenopora iiiformis, Lonsdale, in Strzelecki's Phys. Descript. New 

 South Wales, p. 2(34, pi. yiii. tigs. 4, 4rt (1845), 



Ohs. The figured type of this species, now in 

 Museum, is a portion of a sublobate mass, 

 preserved in a light brown rock, and itself 

 silicified. It is about 2 inches wide and 

 an inch or rather more in height, and its 

 general appearance is very faithfully given 

 in Lonsdale's figure [loc. cit.). The speci- 

 men comprises the outer portion of a large 

 corallum, and shows that the tubes, which 

 are approximately vertical in the centre 

 of the mass, radiate outwards in all 

 directions with a gentle inclination. In 

 the deeper parts of the mass the tubes are 

 in the main cylindrical, but are swollen at 

 intervals, the swellings being of but small 

 intensity and being placed at correspond- 

 ing levels in contiguous tubes (woodcut, 

 fig. 1). Hence the corallites are not in 

 complete contact throughout, as is particu- A few of the tubes of 

 larly well seen at the broken upper end Stenopora infomiis, 

 of the specimen, where the tubes are Lonsd. (type-speci- 

 p I ' 1 rri ii !• men), enlarged, 



iractured transversely. Ihe growth ot (Drawn bv Mr. A. H. 



the corallum must have been periodic, as Foord.)" 



the British 

 Fig. 1. 



