866 Transactions of the Society. 



A. Cahalli Sell. Atl., pi. xxxii. figs. 1, 2. 



Circular or snbcircular, diam. from • 0425 to " 05 mm. Surface 

 rising gradually at the processes. Colour subbyalinc. Central space 

 rounded, indistinct, about 0*0025 mm. broad. jMarkings obscure, 

 sometimes a set of delicate striae converging to eacb process just 

 yisible, tbose at tbe middle of tlie intervening space diverging slightly 

 towards the border ; at their outer ends, and close to the border, a few 

 well-marked round apiculi. Processes .3, circular or obtusely triangular, 

 about O-lOG mm. broad.— H. L. Smith. Sp. 1 »iat. Typ., No. G17. 



Habitat: Venezuela (H. L. Smith!); Puerto Cabello (Grundler, 

 Weissflog ') ; Santa Marta (Firth !). 



A. punctulatus Grun., Sch. Atl., pi. xxx. fig. 10. 



Circular, diam. about 0*045 mm. Surface subplain. Central 

 space obscure. IMarkiugs obscure, strife converging to the processes 

 undifferentiated ; apiculi distinct but minute, forming a narrow 

 irregularly elliptical band around the clear central area, and a some- 

 what broader band around the border, a few close to, and on the central 

 side of the processes. Processes 2, rounded, about * 009 mm. broad. 



Habitat : Simbirsk Polirschiefer (Schmidt). 



A. i^ropinquus Grove & Sturt, Journ. Quek. Mic. CI., 1887, p. 141, 



pi. xii. fig. 31. 



Subcircular, diam. 525 to 0*0625 mm. Surface flat at the 

 centre, slope at border gentle. Colour pale grey. Central space sub- 

 quadrate or rounded, * 0035 mm. broad. Markings obscure, dehcate, 

 curved, striae radiating and diverging from the central space towards 

 the border; ajiiculi prominent, numerous, fewer on a narrow zone 

 about 7/10 to 3/4 of radius from the centre, somewhat larger on a 

 distinct band close to the border. Processes 2, circular, 01 to 

 0*0125 mm. broad, placed close to the central space. 



Habitat : Oamaru deposit (Gray ! Grove & Sturt ! Hardman !). 



A. nehulo-punctatus Leud.-Fort., Diat. Ceyl., p. 63, pi. vii. fig. 13. 



Subcircular, diam. * 0875 mm. Surface slightly elevated between 

 the processes for about 1/3 of radius from centre, outside of this almost 

 flat. Colour pale grey, darker around the edge of the elevated area. 

 Central space round, * 01 mm. broad, distinct. Markings punctate, 

 minute, in radiating stride straight or slightly flexuous, subpruinose on 

 the elevated area, converging but slightly to the processes, beyond the 

 elevated area only visible near the border ; apiculi on a narrow 

 band close to the border, distinct, crowded, irregular, minute. Pro- 

 cesses 2, flat on the central side, elsewhere convex, reaching the 

 border, * 025 mm. broad, their border uniform narrow, the central 

 portion distinctly punctate. 



Habitat : Ceylon (Deby ! Kitton *). 



• In the Collection of Mr. E. Grove. 



