318 Transactions of the Society. 



1/35 to 1/50 of diam broad, coarsely punctate. Markings as in var. 

 hungarica, but 4 in 01 mm., the rows subradial. Primary rays 

 inconspicuous. Processes 7 to 9, insertion 1/6 to 1/8 of radius from 

 circumference. — A. subangulatus Pant., ibid., p. 60, pi. ii. rig. 11 ; 

 pi. xxviii. p. 276. 



Greville united in bis collection under A. angulatus specimens of 

 A. spectabilis, A. decorus, and A. amoenus var. subdecora. Some 

 Kekko forms of tbe var. neogradensis are transitional to A. amoenus. 



Pantocsek's original specimens of A. subangulatus, with wbicb be 

 also associates Kinker's Kekko valve (Scb. Atl., pi. cv. fig. 8), are worn 

 forms of tbis var. 



Habitat : Szent Peter, Szakal, and Kekko deposits, Hungary 

 (Pantocsek !) ; Santa Marta deposit (Weissflog ! Griffin !). 



Var. plana. — Diam. • 1075 mm. Surface rising to about semi- 

 radius, bigbest zone convex, broad, outside of tbis primary rays but 

 sligbtly elevated above level of compartments. Colour ligbt grey 

 towards centre, most opaque about semiradius, and on semicircular, 

 centrally convex areas surrounding tbe processes. Central space 

 round, about 1/12 of diam. broad. Markings rounded, or bluntly 

 angular, in irregular concentric bands towards central space. Processes 

 11, insertion about 1/9 of radius from circumference. 



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



A. rotulus sp. n. — Diam. * 195. Surface flat at central space, 

 tbence rising for about 1/4 of radius, bigbest zone 1/4 of radius 

 broad, its outer edge abrupt and primary rays in same plane witb it 

 to processes ; inflations abrupt, about 1 /4 of radius in greatest breadth, 

 at eacb angle an irregularly rounded lobe witb longer axis at rigbt 

 angles to corresponding ray, compartments flat near border. Colour 

 pale to slaty grey, mottled witb darker spots, darker at sides of infla- 

 tions. Central space irregularly round, about 1/16 of diam. broad, 

 faintly punctate. Markings rounded, 3 in 0*01 mm., interspaces 

 unequal, punctate, rows subradial to outer edge of bigbest zone, beyond 

 tbis more parallel, straigbt or forming wide curves. Primary rays 

 witbin bigbest zone undifferentiated, outside of tbis distinct. Border 

 striae, 8 in 0'01 mm., about 1/26 of radius broad, inner edge distinct. 

 Processes 8, insertion about 1 /8 of radius from circumference, proximal 

 part rounded, distal cylindrical, free ends convex. Allied to A. angu- 

 latus tbrougb its var. hungarica.— -PI. V. fig. 10. 



Tbe scar of tbe broken-off process is rounded. 



Habitat : Newcastle deposit, Barbadoes (Firtb !). 



A. grevilleanus Norman, Grrev., Trans. Mic. Soc. Lond., 1864, 

 p. 10, pi. i. fig. 1. — Diam. about 0*0275 mm. Surface witb several 

 distinct concentric zones to about 1/4 of radius from centre, the area 

 adjoining primary rays sharply defined, with sides straigbt, and con- 

 verging inwards. Central space circular, about 1/28 of diam. broad, 

 byabne. Markings round or oblong near centre ; rows radial, beyond 

 central zonate area forming evident oblique curved intersecting 

 secondary rows, on area adjoining primary rays are wart-like cushions, 



