020 Transactions of the Societn. 



somewhat around the processes, or small, round, granular, with evident 

 interspaces largest towartls the centre, and arranj,'ed without order. 

 Trccesses low, most prominent towards the border, 2 or 3 larger, 

 sometimes asymmetrical, between these 3 to 8 smaller similar pro- 

 cesses at subregular intervals. Border distinct, sharply defined, striae 

 sometimes indistinct. — Lampriscus pro parte Grove ^ Sturt, Journ. 

 Quek. Mic. CI., 1887, p. 138 ; Eupodiscus pro parte Grove & Sturt, 

 Bot. Centralbl., Bd. sxxiv. Nos. 15-16, p. 38. 



/. Dehji. — Eupodiscus Debyi Grove &: Sturt, Bot. Centralbl., 

 Bd. xxxiv. isos. 15-16, p. 38. 



Diam. 0'r2 to 0*125 mm. Surface distinctly convex towards 

 the border. Central space circular, 1/5 to 1/6 of diam. broad, with a 

 few isolated round granules. Markings areolate, 4i to 5 in '01 mm., 

 subequal ; rows distinct, straight or flexuous, converging around the 

 processes, secondary oblique decussating rows evident. Processes 2, 

 larger, opposite, with rounded inner and outer edges and flattened 

 sides, about • 02 mm. broad, 3 smaller intervening, about "0125 mm. 

 broad, subcu'cular, roundly elliptical, with major axis at right 

 angles to corresponding radius. Border sharply defined, striae evident, 

 5 in • 01 mm. 



Habitat : Oamaru deposit (Grove & Sturt ! "W. J. Gray !). 



I. mirijicus sp. n. 



Diam. 0"1375 mm. ^Surface almost flat, but slightly convex at 

 border. Central space and rosette absent. Markings small, round, 

 granular, and without order towards the centre ; towards the border 

 subangular, more crowded, and in faint radial rows, short rows con- 

 verging round each process. Processes 2, large, rounded, about 

 • 02 mm. broad, more protuberant on the outer edge, subopposite ; 

 a third similar, but somewhat smaller, about 0*015 mm. broad, at 

 equal distances from the former on one side of the valve ; 8 still 

 smaller, 0*0075 mm. broad, on the opposite side between the 2 large 

 processes, and 5 of similar size between the latter and the intermediate 

 process. Border distinct, striae obscure. — PI. XYI. fig. 4. 



Uabitat ! Oamaru deposit (W. J. Gray !j. 



Abtificial Key. 



A central sjMice. Markings obviously areolate, rows evident 



between central spaoe and border Debyi 



No central space. Markiugrs small, round, granular, without 

 order towards ceutre, nearer border subangular, iu faint 

 radial rows mirijicus 



