A Revision of the Genus Aulaeocliscus Ehrb. By J. Rattray. 347 



by distinct hyaline radial interspaces. Primary rays well marked, 

 beyond central area sometimes rising slightly to processes, the rows 

 diverging widely outwards, again converging more distinctly towards 

 processes, and continued to border. Border striae distinct, 8 in 

 0*01 mm. Processes 4, insertion about 1/6 of radius from circumfer- 

 ence, symmetrical. — PI. V. fig. 9. A. spectabilis Grove & Sturt, Journ. 

 Quek. Mic. CI., 1887, p. 14. The scar of broken-off processes is oval. 



Habitat : Oamaru deposit (Grove ! Doeg !). 



A. angulatus Grev., Trans. Mic. Soc. Lond., 1863, p. 71, pi. v. 

 fig. 15. — Valve rarely elliptical. Diam. • 09 to • 325 mm. Surface 

 rising for 1/3 to 1/2 of radius, highest zone distinct, 1/6 to 1/10 

 of radius broad, compartments from highest zone to zone of processes 

 first slightly convex, then concave, flat towards border ; primary rays 

 sloping uniformly downwards to processes. Colour pale or dark 

 grey. Central space round or angular, 1/15 to 1/18 of diam. broad, 

 punctate. Markings round or angular, 3 1 to 4 in • 01 mm., outlines 

 delicate, central dot brilliant, interspaces punctate, rows subradial or 

 subparallel on compartments. Primary rays distinct, rows not diverg- 

 ing. Border striae 6 to 8 in - 01 mm., about 1/30 of radius broad, 

 indistinct. Processes 5 to 16, insertion 2/9 to 2/15 of radius from 

 circumference, proximal portion somewhat larger than distal, con- 

 striction submedian (towards apex), free ends rounded. — Sch. Atl., 

 pi. xxxiv. figs. 7-8 ; pi. ciii. tig. 2 ; pi. cv. fig. 7. The scar of 

 broken-off process is oval. 



Habitat : Cambridge deposit, Barbadoes (W. J. Gray !) ; shell 

 cleanings, S. America (Hardman !) ; Pacific Ocean (Weissflog !); 

 'Gazelle' Exped. (Janisch !) ; Oamaru deposit, New Zealand (Grove & 

 Sturt !). 



Var. hungarica. A. hungarieus Pant., Fossil. Bacil. Ung., p. 57, 

 pi. xxv. fig. 231. — Diam. 0*15 to 0'225 mm. Surface more sharply 

 crateriform, rising for 1/5 to 2/9 of radius, highest zone 1/7 to 2/7 

 of radius broad, when wide angular at primary rays ; inflations more 

 prominent. Central space irregular, 1/35 to 1/90 of diam. broad. 

 Markings subquadrate, 4^ in 0*01 mm., rows parallel on each com- 

 partment, secondary concentric bands distinct to outer edge of highest 

 zone, outside of this more straight across compartments. Primary 

 rays more prominent. Border striae 8 to 10 in O'Ol mm., 1/35 to 

 1/45 of radius broad. Processes 7 or 8, cylindrical, constriction slight, 

 proximal ends more opaque, free ends truncate, no clear space at 

 base. 



Habitat : Szent Peter deposit, Hungary (Pantocsek ! Hardman ! 

 Grove !) ; Szakal and Kekko deposits, Hungary (Pantocsek !) ; Santa 

 Marta deposit (Griffin !). 



Var. neogradensis. A. neogradensis Pant., ibid., p. 59, pi. xxv. 

 fig. 227.— Diam. 0-125 to 0*19 mm. Surface flat for 1/5 to 1/7 of 

 radius, highest zone 1/8 of radius broad, outer edge convex outwards 

 on compartments, angular on both sides at primary rays, more rarely 

 on outer only ; inflations short. Central space irregularly angular, 



