Victor LUii Fossil Selenariickte. 215 



which, when incine fated, show one or two irregular rows of small 

 pures. Zooecia hexagonal, with margins raised. Thyrostorae 

 large, nearly circular, vvith a narrow raised granular border. 

 The zooecia in the centi'al portion of the zoarium are sometimes 

 covered with a granular calcareous growth, leaving two or more 

 elongated openings on the face. Vibracular cells large, irregu- 

 larly oval, with wedge-shaped perforations radiating from the 

 median line. 



Localities. — Investigator Strait, S.A., 15 fathoms ; Royston 

 Head, Yorke's Peninsula, S.A., 15 fathoms (Dr. Verco); Fossil, 

 Jimmy's Point (J. Dennant). 



In the shape of the zooecia this somewhat resembles S. mar- 

 ginata, T. Woods, but the form of the thyrostome is different, 

 and the vibracular cells are large and oval, instead of being very 

 small. I have figured a portion of an incinerated specimen, 

 which shows the peculiar manner in which the older zooecia are 

 closed, or nearly so, by calcareous growth. 



I had found some fragments of this in the deposit from 

 Jimmy's Point, and had put them aside for further examination; 

 on comparing them with the recent form, I tind they agree with 

 it in every particular. 



Lunulites patellifopmis, nov. sp. (PI. XXV., Fig. 6). 



Zoarium thick, oval, much raised, one end sloping very 

 abruptly ; very large, 28 to 40 mm. long, 25 to 35 mm. wide, and 

 15 to 25 mm. high. Zooecia disposed "in regular radiating lines, 

 elongate, sides parallel, distal margin arched, proximal incurved, 

 margins raised, granular or crenate, a more or less developed 

 broad mucro in the proximal margin of some of the zooecia. 

 Four small circular communication pores on the lateral walls in 

 a transverse row near the upper surface. Vibracula in single 

 longitudinal series between each row of zooecia ; vibracular area 

 elongated, slightly broader distally ; vibracular mandible narrow, 

 slendei", with an acute apex. Under surface of zoarium with 

 radiating ridges covered with an epidermis, when incinerated the 

 calcareous layer is seen to be granulated, and there are disclosed 

 a number of very large pores, varying considerably in size, 

 irregularly placed, but sometimes longitudinally disposed, and 



