360 Transactions of the Society. 



p. 59, pi. ii. figs. 9, 10, pi. xxv. fig. 225 ; A. Chasei Pant., ibid., p. 57, 

 p]. xxix. fig. 294 ; A. oregonus var. sparsius-punctata Grim, in Sell. 

 Atl., pi. cvii. fig. 6. 



Habitat : Szent Peter deposit (Pantocsek !) ; Santa Monica deposit 

 (Bae ! Cleve !) ; Sta. Maria deposit (Bae !) ; ex Holothuriis, China * 

 (Macrae !) ; Posiette Bay (Beresford !) ; Los Angelos, California 

 (Cleve !) ; Japan oysters ("Weissflog ! Bae !) ; Yokohama (Hardman !). 



Var. Lunyacsekii. — l)iam, 0'19 to 0*23 mm. Surface with 

 concavities between processes shallow, rarely deep. Colour pale grey 

 with darker zones near processes. Central space irregular, 1/13 to 

 1/18 of diarn. broad. Markings, polygonal, 3^ to 4 in 0*01 mm., inter- 

 spaces near centre narrow. Border with 2 bands of oval granules, 

 6 in 0*01 mm. Processes 13 to 16. — A. Lunyacsekii f. major Pant, 

 in litt. 



Habitat : Kekko and Szakal deposits (Pantocsek !). 



Var. commutata. — Diam. - 22 mm. Surface flat to 1/3 of 

 radius, adjacent to this a narrow hyaline irregular zone 1/22 to 1/24 

 of radius broad, outside of this rising for a short distance, thence fiat to 

 processes. Colour pale grey to bluish. Markings within hyaline zone 

 round, outside of this angular, 6 in 0*01 mm., rows subradial. 

 Primary rays undifferentiated within hyaline zone. Border striae 

 10 to 12 in 0*01 mm., about 1/55 of radius broad. Processes 19, 

 insertion about 1/7 of radius from circumference. 



Habitat : Sta. Monica deposit (Bae !). 



A.pulclxer\ Norman, in Pritch. Inf., p. 845, pi. viii. fig. 28. — 

 Diam. 0*1025 to 0'205 mm. Surface fiat to about 3/8 of radius, 

 thence primary rays rising gently to processes, concavity between 

 these shallow, slope to border gentle. Colour light grey at centre, 

 pale blue outwards for 1/2 to 2/3 of radius, thence dark grey to 

 border. Central space rounded, 1/16 to 1/20 of diam. broad, smooth. 

 Markings round, 4 in O'Ol mm., central dot brownish, moniliform 

 towards border, interspaces hyaline, rows subradial to almost parallel 

 on compartments, secondary irregular concentric bands towards centre. 

 Primary rays distinct, straight, the rows diverging on outer 2/3 of 

 length. Border striae 10 to 12 in '01 mm., 1/40 to 1/55 of radius 

 broad, adjacent to its inner edge a narrow hyaline space. Processes 



* Specimen presented to British Museum by G. H. King. The Holothurice, 

 though sold in the China market, are mostly, according to Dr. Macrae, from Torres 

 Straits and the adjoining islands. 



f As this species has long remained doubtful the following remarks by Kitton 

 are of interest : — " Norman had his sample of Monterey stone from Mr. Brightwell or 

 myself, and it was in this that he found A. jiulcher, of which he sent me a specimen. 

 Unfortunately I lent it to Eulenstein when he undertook at Prichard's suggestion 

 a new edition of the diatom part of the Infusoria, and this with several others were 

 not returned. I find several slides marked A. pulcher, mounted some time before I 

 parted with Norman's preparation ; it therefore seems pretty clear that I knew this 

 form, but the valves all have a smooth centre, and not one irregularly punctate, as 

 Kalfs describes and figures it." I have examined these specimens, and they conform 

 to the above definition. Somewhat worn forms transitional to A. affinis occur in 

 Sla. Monica deposit. 



