1888-89.] Mr John Eattray on the Genus Coscinodiscus. 529 
secondary oblique curved decussating rows distinct ; a narrow 
hyaline band adjacent to the border. Border narrow, sharply 
defined, with small evident granules 6 in -01 mm. — C. nebula , 
Ehrb.? Abh. Ber. Ah., 1872, p. 167, pi. xii. fig. 15. Sp. n. ? 
Sch., Atl., pi. lviii. fig. 12. 
C. nebula , Ehrb., is an imperfectly defined species, approaching 
C. radiolatus, Ehrb., and C. intermedins , Ehrb.; its insertion here 
is provisional. 
Habitat . — Railway cutting, Oamaru (Grove !) S.E. of Bhjuts- 
kaja Kossa, Sea of Azof (Ehrenberg). 
Yar. hispida, nov. Sch., All ., pi. lviii. fig. 38 (no name). — 
Diam. about ’035 mm. Markings 6 to 7 in *01 mm ; apiculi 
prominent, numerous, at intervals of about '0075 mm., inserted 
some distance within border. 
Habitat . — Yokohama (Griindler). 
C. exutus , sp. n. — Diam. *0775 mm. Central space and rosette 
absent. Markings polygonal, increasing slightly outwards to the 
marginal band ; at the centre 6 to 7, about the semiradius 5 to 5 J, 
on the sharply defined marginal band, 10 in *01 mm., this band 
about J of radius broad; rows radial from the centre to the 
marginal band, upon the latter the oblique decussating rows more 
evident. Border narrow, distinct. 
Habitat . — Los Angelos (Hardman !).* 
C 1 debilis , sp. n. — Diam. *3 mm. Surface almost flat, a gentle 
slope near the border. Central space and rosette absent. Mark- 
ings hexagonal, 5 to 7 in '01 mm., slightly smaller at the centre, 
and towards the border submoniliform ; central papillae distinct ; 
secondary curved oblique decussating rows evident ; minute subu- 
late areas at the origin of the shorter rows. Border sharply defined, 
usually opaque, about A_ 0 f radius broad ; its broad or inner portion 
closely and irregularly punctate ; the outer with evident striae, 6 or 
7 in *01 mm. — (PI. I. fig. 4.) 
Habitat. — Jackson’s Paddock, Oamaru deposit (Grove !). 
C. dubiosus, Grun. MS. — Diam. *0925 to *15 mm. Central 
* In the collection of Julien Deby. 
VOL. XVI. 25/10/89 2 L 
