640 Proceedings of Royal Society of Edinburgh. [sess. 
broad. Markings : a single rounded granule at middle of central 
space; rays between central space and middle of inner ends of 
compartments absent, but well-defined, subpearly, subclavate areas, 
tapering gradually outwards, sometimes slightly flexed, and each 
with a narrow delicate flexuous line close to their edges, extending 
between central space and outer ends of intervals, the lines from 
the sides of the adjacent areas meeting one another at their inner 
ends ; the compartments reaching about i of radius inwards, their 
inner edge convex towards the centre, the areolae distinct, 6 to 8 
in *01 mm.; at irregular wide intervals a few more prominent 
rounded dots ; the intervals not reaching the border, tapering 
outwards, their outer ends convex. 
Habitat. — Nancoori deposit (Van Heurck). 
A. punctata. Grev., Trans. Micr. Soc. Lond ., 1862, p. 51, pi. viii. 
fig. 32. — Diam. ‘0625 mm. Central areolate area subelliptical to 
round, about *0075 mm. broad. Markings on central area unequal, 
4 to 5 in *01 mm.; rays 6 to 7, straight; the compartments reach- 
ing about \ of radius inwards, their inner ends transversely truncate 
or slightly concave inwards opposite the radii ; the areolae few, 
granular towards their inner ends, towards the border 6 to 7 in 
*01 mm., with hyaline interspaces; the intervals wide, sometimes 
expanding slightly outwards, their outer ends transversely truncate, 
sometimes reaching the border. Border, narrow, indistinct, sub- 
hyaline. 
The smaller areolae on the central area may be so disposed as to 
form an arc round a somewhat larger unilateral areola. 
Habitat . — Barbados deposit (Greville !). 
A. balearica. Cleve, Kongl. Sv. Vet.-Akad. Handl. Stockh ., 
1881, Bt. xviii. No. 5, p. 20, pi. v. fig. 59. — Diam. *0715 mm. 
Central space circular, hyaline, about of diam. broad. Mark- 
ings : rays straight, symmetrical ; the compartments reaching 
about of radius inwards, their inner ends uniformly and con- 
siderably convex, areolate; the areolae subequal or decreasing but 
slightly outwards, 9 in ’01 mm.; the intervals of uniform breadth, 
their outer ends convex, reaching about |- of radius from centre. 
From A. Grevillei this differs not only in the coarser character 
