628 
Proceedings of Royal Society of Edinburgh. [sess. 
rarely at unequal intervals opposite its sides ; on the interradial areas 
round or angular irregularly disposed unequal granules; interspaces 
unequal, hyaline. Border hyaline, sometimes broad and angular. 
Van Heurck has recorded his belief that Actinogonia are hut the 
“ valves interieures ” of Asterolamprce. Of this I have observed no 
evidence, hut the possibility of their being so is to be borne in 
mind. 
A. multiradiatum , sp. n. — Diam. *05 mm. Surface with central 
area, extending to about -§ of radius from centre. Colour pale grey, 
somewhat darker towards border. Markings on central area sub- 
angular, unequal areolae about 4 in *01 mm., most crowded at 
the centre ; rays short, occupying middle third of valve, broad, 
subclavate, or with lateral irregular lobes ; the interradial areas 
hyaline, on outer third bearing rounded or irregularly angular 
pearly granules, without order, and decreasing outwards, 4 to 
4J in -01 mm.; adjacent to the border a hyaline band of unequal 
breadth. Border narrow, hyaline. — (PI. III. fig. 15.) 
Habitat . — Barbados deposit (Hardman !).* 
A. septenarium. Ehrb., Mon. Ber. Ah., 1847, p. 54. — Obtusely 
angular. Diam. *055 to ’07 mm. Surface with central area 
indistinctly defined, about *01 mm. broad. Markings on central 
area small, round or obtusely angular subequal granules, with 
hyaline unequal interspaces; rays distinct, extending between 
central area and angles of valve ; short similar rays sometimes 
intercalated towards outer portion of interradial areas, rarely’ two 
rays proceeding side by side towards the same angle, straight 
or gently curved, rarely flexuous; on the interradial areas round 
unequal irregularly disposed granules, with hyaline unequal inter- 
spaces, few close to the outer sides of those areas. Border angular, 
about -Jg- of radius broad, widest opposite the middle of the inter- 
radial areas. — Ehrb.; Mikrog ., pi. xxxvi. fig. 39 ; Ralfs in Pritch. 
Inf., p. 813, pi. v. fig. 55; Ehrb., Abh, Ber. Ah., 1875, p. 38, 
pi. i. fig. 4; Van Heurck, Syn. Diat. Belg., pi. cxxvii. fig. 8; 
A. quinarium, Habirsh., Cat. Diat. § Adinogonium. 
Habitat. — Cambridge deposit, Barbados (Van Heurck); Spring- 
field deposit, Barbados (Hardman !). 
* In the collection of Mr Julien Deby. 
