178 Appendix to Part L 



DESCRIPTION OF SIX SPECIES OF CORALS, 

 FROM THE PALAEOZOIC FORMATION OF 

 YAN PIEMEN'S LAND. 



By W. LONSDALE, Esq., F.G.S. 



1. STEXOPOEA. TASMAXIE^SIS, sp. n. 1 



Branched, branches cylindrical, variously inclined or contorted; 

 tubes more or less divergent; mouths oval, divisional ridges 

 strongly tuber culat td ; indications of successive narroicing in 

 each tube, 1 — 2. 



This coral, in its general mode of growth, resembles Calamopora 

 (JStenopora ?) tumida, (Mr. Phillips, 'Geol. of Yorkshire,' part ii. 

 pi. 1, fig. 62), but in the form of the mouth and other structural 

 details the differences are very great. Stenopora Tasmaniensis 

 attains considerable dimensions, one specimen being 4^ inches in 

 length and half an inch in diameter. 



The branches hare individually great uniformity in their circum- 

 ference, but they differ with respect to each other in the same speci- 

 men, and there is no definite method of subdivision or direction 

 of growth. The extremities are occasionally hollow ; and one 

 specimen, about 1^ inch in length, and half an inch in breadth, is 

 crushed completely flat. The tubes, in the best exposed cases, have 

 considerable length, springing almost solely from the axis of the 

 branch, and diverging very gently till they nearly re^ch the circum- 

 ference, where they bend outwards. In the body of the branch 

 the tubes are angular from lateral interference ; but, on approaching 

 the outer surface, they become oval in consequence of the inter- 

 spaces produced by the greater divergence. Their diameter is very 

 uniform throughout, with the exception of the narrowings near the 

 terminations of the full-grown tubes. The walls in the interior of 



1 Though the characters of this genus are unpublished, it has been 

 thought advisable not to give them fully in this notice, a very few 

 species only having been examined. The coral is essentially com- 

 posed of simple tubes, variously aggregated and radiating outwards. 

 The mouth is round or oblong, and surrounded by projecting walls, 

 having along the crest a row of tubercles. The mouth originally 

 oval is gradually narrowed (a-revos) by a band projecting from the 

 inner wall of the tube, and is finally closed. [Shortly after the pub- 

 lication of the first edition. Mr. Lonsdale informed me that he 

 believed this coral ought to have been included in the genus Tham- 

 nopora of Steininger.j 



