CARBONIFEROUS FOSSILS. 383 



carried into the fossula. The latter is rather large, deep, 

 placed on the (dorsal) curved side, and not at all invading 

 the central tabula. One, or more frequently two, of the 

 septa are abbreviated by it. The intermediate septa are ex- 

 tremely small and quite marginal. 



The vesicular tissue is close and conspicuous between the 

 septa, and in the cross section it forms a definite outer zone 

 only three-eighths of an inch wide in a specimen two inches 

 and a half in diameter. The horizontal tabulae are wide, close 

 set, not reaching quite across the central space, but imbricat- 

 ing. The lamellae are nearly straight and equal, and leave 

 only about one-third of the diameter free from them. 



This is rather doubtfully referred to the genus. It has a 

 thin crest-like columella connected with the primary septum 

 opposite to the fossula, and should therefore be a Lopho- 

 phyllum (Edw. et Haime). But this crest is so rudimentary 

 in some specimens, and the habit is so much that of Zaphren- 

 tis, that we leave it for the present among them. It has well 

 developed central tabulse bare of lamellse in the middle, and in 

 this respect it is like the other large species, Z. fungites, Z. cy- 

 lindrica, etc. 



The septa are strong and continuous, and appear to extend 

 all down the visceral chamber, and not merely to be spread 

 out on the surface of the tabulae. This is shown both in 

 weathered casts and in transverse polished sections. Perhaps 

 this indicates an approach towards the Cyathaxonidce. 



A rough resemblance to the horn of a ruminant has sug- 

 gested the specific name. 



LOCALITY. Very common among the loose fragments at 

 Depot Point. It is generally well preserved. A Zaphrentis, 

 probably the same species, occurs further to the east, in Prin- 

 cess Royal Island, and at the entrance of Jones's Strait. 



CLISIOPHYLLUM TUMULUS (n. sp.). 

 Plate XXXVI, fig. 6. 



A curved and twisted trumpet -shaped tube four inches long, 

 annulated by rough ridges of growth and marked by faint 



