648 
Proceedings of Royal Society of Edinburgh. [sess. 
remaining areolae decreasing gradually outwards from 6 to 9 in *01 
mm.; the intervals expanding gradually outwards, their outer ends 
swollen, knob-like, reaching close to the border. 
Habitat. — Barbados deposit (Greville !). 
A. splendida. Grey., Trans. Micr. Soe. Lond ., 1862, p. 48, pi. 
viii. fig. 25. — Diam. *09 mm. Central areolate area distinct. 
Markings on central area unequal, about 2J in ’01 mm.; rays 
straight, or but slightly arcuate, many ; the compartments reaching 
about of radius inwards, their inner ends concave, bounded by a 
band of large areolae 3J in -01 mm. broad, and extending outwards 
almost to the border, those at the edges of the compartments with 
inner ends protuberant and rounded ; close to the border the areolae 
obscure, subpunctiform, 12 in *01 mm.; the intervals of uniform 
(•0025 mm.) width, their outer ends close to the border, convex 
outwards. — A. vulgaris , var. e, Grev., ibid, 1862, p. 47. 
The great length of the areolae at the inner ends of the compart- 
ments at once distinguishes this species from A. vulgaris , to which 
Greville united it with some hesitation. 
Habitat. — Barbados deposit (Greville !). 
A. ur aster. Grove and Sturt, Jour. Quek. Micr. Cl., 1887, p. 
143, pi. xiii. fig. 42. — Diam. *06 mm. Central areolate area 
distinct. Markings on central area large, 2 to 2J- in ‘01 mm.; rays 
straight, two passing to the apex of one of the compartments; the 
compartments reaching from § to f of radius inwards, conical, their 
inner ends obtusely angular, the areolae evident, decreasing but 
slightly outwards, from 5J- to 6 in ’01 mm.; the intervals broad, 
attenuating somewhat outw T ards, not reaching the border ; a 
minute round granule (apiculus V) at the outer end of each. 
The apex of the compartment that receives the two radii is 
somewhat obliquely truncate, and slightly concave towards the 
centre. 
Habitat. — Oamaru deposit (Gray). 
A. rylandsiana. Grev., Trans. Micr. Soc. Lond., 1862, p. 49, 
pi. viii. figs. 28, 29. — Diam. *04 to *05 mm. Central areolate area 
about ’01 mm. broad. Markings on central area subequal, about 
3 in *01 mm.; rays 7 to 12, straight, or but slightly flexed ; the 
