

A 



18 



There are two fine specimens in the collection of the Tas- 

 manian Museum. The species is readily distinguished from 

 C. tenuistrata, and other forms by its much wider apical angle. 

 Dr. Waagen has recently figured a portion of a similar form 

 from the olive group of the Salt Bange, India, where it is 

 associated with G. laevigata and G. tenuistrata as in Tasmania. 



CoNULABIA L^JVIGATA (Morris). 



Shell smooth, elongate, pyramidal, rectangular, gradually 

 decreasing ; two of the faces larger than the other two ; faces 

 slightly concave, longitudinally sulcated at the lateral angles, 

 ornamented with equal transverse ridges, forming a slightly 

 obtuse angle in the mesial furrow, where they alternate with 

 each other ; ridges terminating at the bottom of the lateral 

 channels, curving slightly upwards, and alternating with each 

 other, producing a somewhat granulated ridge, apical angle 

 very acute, not exceeding transverse, striae simple, some- 

 what sharp, close, and regular — 16 in the space of half-an-inch. 



Locality. One imperfect cast from Upper Palaeozic lime- 

 stones, River Styx, and occasionally found at Porter's Hill 

 associated with Spirifera convoluta, 8. glaber, 8. Tasmaniensis, 

 8. duodecimo-costata, and other well-known forms. Occurs 

 also at Tass Plains, New South Wales. 



NOTES ON THE GEOLOGY OE BRUNI ISLAND. 



By Robt. M. Johnston, E.L.S. 



[Bead April 13, 1886.] 



Bruni Island is separated from the mainland of Southern 

 Tasmania by the tortuous course of D'Entrecasteaux 

 Channel, Its greatest length — north and south — from 

 Kelly's Point to Bruni Head is about 31 miles. Its breadth 

 is extremely variable. A mere strip of sand over seven miles 

 long divides Isthmus Bay on the western side from Adventure 

 Bay on the eastern side, and the same narrow neck forms the 

 junction between North Bruni and South Bruni. The 

 breadth of North Bruni varies from five to seven miles, and 

 the breadth of South Bruni varies from three to lOf miles. 



This variation in breadth is caused by the deep and wide 

 indentations of its numerous bays, among which may be 

 mentioned — Barnes Bay, Great Bay, Isthmus Bay, Little 

 Taylor Bay, Great Taylor Bay, Cloudy Bay, and Lagoon, 

 Adventure Bay. 



