574 Proceedings of Royal Society of Edinburgh. [sess. 
*01 mm., closely disposed in the rows, interspaces hyaline ; rows 
radial or somewhat oblique, straight; adjacent to the border a 
narrow hyaline band. Border striae, evident, 6 in *01 mm. 
Habitat. — Springfield deposit, Barbados (Schmidt). 
C. gemmaiulus. Cstr., Diat. Cliall. Exped ., p. 161, pi. xvii. 
fig. 9. — Diam. about *04 mm. Central space indistinctly defined, 
about i of diam. broad. Markings round, granular, subequal, 
minute with hyaline interspaces ; a circlet of minute closely placed 
dots (apiculi 1 ?) at inner edge of border; rows irregular, radial. 
Border distinctly defined, about i of radius broad ; striae delicate, 
10 to 12 in *01 mm. 
Habitat. — Indian Ocean (Castracane). 
C. adinochilus. Ehrb., Mon. Ber. Ak., 1844, p. 200. — Diam. 
about *035 mm. Central space circular, about i of diam. broad, 
bearing isolated rounded granules. Markings granular, rounded, in 
straight, closely disposed rows, with interspaces at origin of shorter 
rows hyaline ; just within the border punctiform, and arranged on 
a sharply defined band in still more crowded radial rows. — Ehrb., 
Mikrog ., pi. xxxv. a, 21. fig. 5 ; Ralfs in Pritch. Inf., p. 829; 
Craspedodiscus adinochilus, Ehrb., Abh. Ber. Ak., 1872, p 26. 
Habitat. — Antarctic Ice Barrier, lat. 78° 10' S., long. 162° W. 
(Hooker).* 
C. galapagensis, Rattray. C. griseus, var. gallopagensis, Grun. ; 
Van Heurck, Syn. Diat. Belg., pi. cxxviii. fig. 7; pi. cxxxii. fig. 1. — 
Diam. *175 to *19 mm. Surface flat from the centre to about semi- 
radius, a slightly convex zone reaching inwards to the semiradius, 
about f- of the radius broad, and merging gradually into the almost 
flat portion adjacent to the border. Central space indistinct, 
rounded. Markings small, round or oval, granular, least crowded 
towards the centre, about 4 in *01 mm.; interspaces hyaline, 
unequal ; rows straight. Border narrow, hyaline. — (PL II. fig. 20.) 
C. griseus, Sch., Atl., pi. lviii. fig. 1. 
Distinguished from C. nitidus by the evident straight radial 
lines, sometimes most distinct on the outer half of the valve. 
Fide Ehrenberg. 
