31-1 MhceUanca. 



Devonian variety) and the F. plebeia (M'Coy) of the British carb. 

 slate, but not determinable with certainty from their state of pre- 

 servation: common in the shale of Korinda, N. S. Wales. 



Glauconome. 

 A species most allied to the G. pluma (Phil.) of the British car- 

 boniferous rocks, and pei'haps identical with it, but not in sufficiently 

 good preservation to determine. Common in the shale of Dunvegan, 

 N. S. Wales. 



Cladochonus (M'Coy), new genus. 



Gen. Char. Polypidom of very thick, straight, slender, calcareous 

 tubes, suddenly dilating at short regular distances into large 

 oblique, cup-shaped terminal chambers, longitudinally striated 

 within ; from the point where the dilatation commences, a second 

 slender tube similar to the first is given off at an angle varying 

 with the species, and terminating at the same distance as the 

 former in a similar cup, bent in nearly an opposite direction to 

 the first, and giving rise at its base to a third slender tube as 

 before. The whole polypidom erect, attached by the base only, 

 which embi'aces some foreign body. 



These singular and beautiful corals have some relation to Aulopora, 

 but differ in their curious erect habit, regular, angular mode of 

 branching, slender, equal, stem-like tubes and abruptly dilated 

 terminal cups bent in nearly opposite directions. The Aulopores 

 are attached for the most part by one side ; the tubes gradually 

 expand to the mouths, which all open nearly in one direction ; 

 they have no regular distance for branching, and frequently anas- 

 tomose. The present corals have also much thicker walls to the 

 tubes, the central hollow being proportionally very small. I for- 

 merly described some species of this group under the genus Jania, 

 being uncertain where to place them ; such are the J. crassa and 

 J. bacularia of the ' Synopsis of the Irish Carb. Limestone Fossils,' 

 which should now be removed to this genus. 



Cladochonus tenuicollis (M'Coy). PI. XI. fig. 8. 



Distinguished by the slenderness of the stems. Common in the 

 Dunvegan shale. 



Stronibodes? AusLralis (M'Coy). PI. XI. fig. 9. 

 I have given the above name provisionally to a species oi Strom- 

 bodes from the calcareous shale of Wagamee, N. S. Wales, having 

 the precise form of the Turbinolia fungites of British writers. It 

 is certainly without ti'ansverse chambers, having the vertical lamellaj 

 twisted about the centre ; the lamellae are about thirty-six in number, 

 all reaching the centre, though grouped in irregular bundles as they 

 approach it. The section is slightly oval, the lamellae in the 

 direction of the long axis being straight, those of the sides much 

 arched. The external surface is striated longitudinally, the strije 

 being double the number of the lamelloB. 



Turbtnolopsis bina (Lonsd.). 

 Agreeing minutely with Devonshire specimens. R are in the shale 

 of Dunvegan, N. S. Wales. 



