352 Transactions of the Society. 



3/5 of radius. Central space rounded, 1/17 diam. broad. Markings 

 3 in O'Ol mm., interspaces towards centre hyaline. Primary rays 

 with rows diverging in outer 1/6 of length. Processes 6, insertion 

 about 1/6 of radius from circumference, sides concave, breadth at 

 proximal and distal ends subequal, length about 3£ times breadth, 

 narrow. — Sch. Atl, pi. xxxvii. figs. 1-3. 



Schmidt regards this, on what appears to me to be insufficient 

 grounds, as perhaps a new species. 



Habitat : California, Pacific Coast (Cleve !). 



Var. robusta Witt, Sch. Atl., pi. xxxvii. figs. 6, 7.— Diam. 

 0-51 mm. Surface rising to zone of processes, slope to border 

 steep. Markings 1^ to 2 in 0-01 mm., often with two lateral dots. 

 Primary rays indistinct towards centre, often interrupted. Processes 

 6 to 17, insertion 1/5 to 1/17 of radius from circumference, large, 

 between insertion and margin two almost parallel dark bands. — Sch. 

 Atl., pi. cv. fig. 3. 



Habitat : Santa Monica deposit (Rae !) ; Yokohama (Witt !). 



Var. distans. — Diam. as in var. Debyi. Central space elliptical 

 to quadrate, about 1/160 of diam. broad. Markings 2 to 3 in 

 - 01 mm., largest at middle of radius, decreasing towards centre and 

 border. Primary rays inconspicuous. Processes 4 , insertion 2/7 of 

 radius from circumference, proximal part larger than distal. — Sch. 

 Atl., pi. civ. fig. 6. 



Schmidt regards this as worthy to be a distinct species. 



Habitat : Calvert Co., Maryland (Weissflog !). 



Var. Khikeri. — A. Kinheri Sch. Atl., pi. cvi. figs. 4, 5. Diam. 

 * 23 to • 25 mm. Surface flat to border. Markings 2£ in • 01 mm., 

 the radial axis shorter than that at right angles to radius, brilliant, 

 decreasing suddenly outside zone of processes. Primary rays some- 

 times interrupted. Processes 4 or 5, insertion 1/4 to 1/5 of radius 

 from circumference, length 3 times breadth. — A. catenarius Witt, 

 Sch. Atl, pi. cv. fig. 5, pi. cvi. fig. 3. The scar of the broken-off 

 process is oval. 



Habitat : California, near Sta. Monica (Kinker !). - 



Var. undosa, Grove & Sturt IMS. Diam. 0-23 to 0'445 mm. 

 Surface, central portion flat, stellate with angles at processes, and 

 sides deeply concave between these. Markings 2£ in - 01 mm. 

 Primary rays distinct. Processes 9 to 14, insertion 1/9 to 1/11 of 

 radius from circumference, obconical, free ends but little rounded. 



The scar of the broken-off process is obovate. 



Habitat : Jackson's Paddock, Oamaru (Grove !). 



Var. Molleri. — A. Molleri Grun., Sch. Atl., pi. xxxiii. fig. 14. 

 Diam. 0*11 to 0*25 mm. Surface as in var. undosa, but angles at 

 processes more obtuse. Markings 3 to 4 in 0*01 mm., rows at 

 middle of compartments cruciform. Primary rays cruciform. Pro- 

 cesses 4, rarely 5, insertion 1/3 to 1/4 of radius from circumference, 

 small hourglass-shaped constriction sharp. — Sch. Atl., pi. xxxv. fig. 6 ; 

 pi. xxxvii. fig. 8 ; pi. xli. fig. 12 ; pi. cii. figs. 1, 2. 



