On Two iS'eiv Teiihu'H Shjh(derid.s. 121 



The regularity of its forui is disturbed by cyclosy.steins, 

 which are scattered irregularly over its surface. The surface 

 is marked by minute pores, which are slit-like, oval, or 

 circular. They are larger and more distinct than the 

 corresponding pores of Deontojiora, and are irregularly 

 scattered. 



The cyclosystems appeal" as cylindrical elevations at right 

 angles to the axis of the branch, and irregular in position. 

 The gastropores have well defined walls of similar texture to 

 the surface of the branch. They are cylindrical in shape, 

 and maintain the same diameter right to the top of the 

 cyclosystem, not as in most other genera, opening into a 

 basin-shaped depression. The dactjdopores are about eight 

 or nine in number, and open directly on the surface ot the 

 ring which forms the boundar}' of the gastropore, not V)eing 

 placed in radial grooves. The apertures are about midway 

 between the inner and the outer walls. No styles were seen 

 in either kind of pore. 



The ampullae are not noticeable externally, but a large 

 distinct pore, with a slightly expanded external opening, is 

 present at a small distance below the cj'closystem in nearly 

 every instance. In Cryptohelia* the ampullae are always 

 developed in connecticjn with the cj-elosy-stems, and the 

 invariable presence of a pore in this position in the present 

 specimen, renders it probable tliat it leads into an ampulla. 

 One or two pores which, though somewhat smaller, have a 

 similar appearance, are placed without relation to any 

 cyclosystem. Named as a compliment to Professor W. 

 Baldwin Spencer. 



Localities — A well-sinking in the Eocene beds at Belmont, 

 near Geelong, and at Schnapper Point. 



My thanks are due to Protessor Spencer for suggestions, 

 and for the loan of works, without which this paper could 

 not have been prepared. 



* Moseley, ojj. cit., p. 477. 



