868 Transactions of the Society. 



irre'^nlarly round, 0"015 to 0*025 mm. broad, their border finely 

 striated, and central portion minutely punctate. — Sch. Atl., pi. xxx. 

 ti"s. 11-13; pi. Ixvii. fig. 6. A. racemosns Kalf's, Trans. Mic. Soc. 

 Lond., 18(53, p. 46, pi. ii. fij]j. 9. A. constellatvs Mills, Journ. Roy. 

 Mic. Soc. Lond., 1881, p. 807, pi. xi. figs. 2, 3. 



Habitat : Peruvian guano (Jauisch) ; Cambridge deposit, 

 Barbadoes (Johnson!); Monterey deposit (Firth!); "Barbadoes" 

 (Greville!); Santa Maria deposit (Kinker ! Rac!*); Newcastle 

 deposit, Barbadoes (Firth ! Weissflog ! Griffin !) ; Jackson's Paddock 

 Oamaru (Grove!); Oamaru deposit (Firth! Kae ! Hardman! 

 Cleve !) ; Santa Monica deposit (Rae ! Cleve ! Grove !) ; Szent 

 I'eter deposit (Pantocsek !) ; Pisagua, Peru (Weissflog!); Islay, 

 Peiu (Grifiin !) ; W. Coast S. America (Kinker!); San Pedro and 

 Peru (Grove!); Mejillones, Bolivia (Fhth!); Ceylon (Kittou!); 

 California, Pacific Coast (Cleve !) ; Iquique (Kitton). 



Var. grandis. — Major axis 0'225 mm., l-jif times minor. Colour 

 pa!e bluish grey, slightly yellowish between the processes, pale yellow 

 around the border. Markings on the central area punctate, between 

 this area and the punctate band in interrupted strands expanding 

 outwards and with hyaline interspaces, towards the border in coarse, 

 sometimes broken striae ; apiculi numerous around the processes and 

 on the intervening bands about the semi-radius, widely scattered on 

 the band at the border. 



Habitat : Pisagua (Kitton !). 



Var. inconspicua. — Subcircular, diam. 0"07 to 0*0925 mm. 

 Central space sub-quadrate or rounded, 0" 0075 mm. broad. Mark- 

 ings striate, the' striae converging to the processes distinct, wide between 

 these, a few straight and diverging from central space, but disappearing 

 about 3/5 of radius from centre ; apiculi indistinct, on lands between 

 processes, the band close to the border less evident, but within it a zone 

 loearing numerous irregular apiculi. 



Habitat: Oamaru de[)Osit, New Zealand (Rae!). 

 Var. sKtjJWWc^a^a.— Irregularly round with one large lobe, diam. 

 about 0*105 mm. Surface with an indistinct central area slightly 

 constricted opposite the central space. Central space circular, 

 • 0125 mm. broad, distinct. Markings striate, the strite converging 

 to the processes evident, those at border obscure ; apiculi numerous, 

 most prominent around the processes and along the edges of the 

 central area, a single well-marked circlet around the border. Processes 

 2, 0*02 mm. broad. 



Habitat : Oamaru deposit (Grove !). 



A. australiensis Grev., Edin. New I^hil. Journ., 1863, pi, iii. fig. 3. 



Circular, diam. 0*07 mm. Surface subplain. Central space 

 circular, distinct, * 0075 mm. broad. Markings obscure, radiating 

 Btriaj slightly curved near the sides of the processes, those between 



* In the Collectious of Dr. Joliii Murray and Dr. Griffiu. 



