quincuncially arranged the pores must be in a linear series. 

 Such a distinction is very arbitrary, and may vary in the same 

 species, or even in the same individual. I do not think the 

 genus Cieptdaria can be maintained. 



Recent Species. 



Lunulites anotjlopora, Spec. nov. 



Plate I., fig. 3a— 3c. 



Zoarium small conical white, rather smooth. Zoooecia very 

 minute, irregular, with an oblique mouth divided into two 

 portions; one half triangular, constricted in the middle ; the 

 other semicircular — both with a raised margin, as well as the 

 vibracular pores, which are long and narrow, and in a depressed 

 area. The cells are obliquely placed ; sometimes in contrary 

 directions alternately. Base flat, with a margin of cell, and a 

 centre of irregular porous or spongy structure ; but the pores 

 well defined, occasionally with a calcareous plate perforated 

 with a ring of five or six pores, and a larger central one. 

 Diameter and altitude about equal, from three to six milli- 

 metres. 



Port Stephens, New South "Wales. 



Both the specimens in the Macleay Museum are worn, and 

 the details of the structure of cells very difficult to make out. 

 It is remotely like Busk's L. Philippinensis, but that seems to 

 have been described and drawn from a much worn specimen. 



Fossil Species. 



Lttnttlites aperta, Spec. nov. 



Plate I., fig. 4a — 4c. 



Zoarium large, orbicular (?), cup-shaped (?), depressed, thin. 



Zoooecia quadrangular, rather narrower below, perfectly open. 



Lamina, if any, worn away. Walls rather thick, regular, 



raised equally thick all round, with a cellular structure. 



Avicular pores oval, constricted in the middle, infundibuliform, 



margin pyriform. Under surface with broad flat irregular 



undulating costse. 



_ The cells, pores, and under surface of this fossil are quite 

 distinct from the living and fossil forms already known. The 

 specimen is very much worn, and is the only one seen by me. 



Locality and Horizon. — Muddy Creek Miocene beds near 

 Hamilton. 



Lttnulites magna, Spec. nov. 

 PL I, fig. 6a— 6d. 

 Zoarium large conical thin, quite hollow beneath or en- 

 crusting ; in the younger specimens (which are ten millimetres 



