1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 519 
(processes?) at intervals of about *01 mm. inserted at inner edge of 
marginal band. Border narrow, hyaline. 
Habitat. — Table Bay (Schmidt). 
C. pectinatus , Rattray. C. decipiens , Grun.; Sch., Atl., pi. lix. 
figs. 18, 19. — Diam. '024 to *0515 mm. Central space and rosette 
absent. Markings angular, subequal, or increasing somewhat to 
about semiradius, again decreasing to border; towards centre 4J 
to 5, about semiradius 3J, near border 4, in °01 mm. ; secondary 
oblique decussating rows manifest ; apiculi prominent, long acicular, 
inserted at inner edge of border, and reaching outwards to its outer 
edge. Border distinct; striae faint, 6 in '01 mm. 
The name decipiens cannot be adopted here, having been already 
applied to a distinct form. 
Habitat . — Table Bay (Schmidt). 
C. bulliens. Sch., Atl., pi. lxi. figs. 11, 12. — Diam. '05 to '1075 
mm. Central space absent. Markings polygonal ; at the centre 2 \ 
to 3, increasing to the semiradius to 1J or 2, again gradually 
decreasing to the border to 6, in '01 mm.; the largest areolae forming 
a conspicuous zone. Border indistinctly defined ; striae short, incon- 
spicuous, 6 in *01 mm. — Cleve and Moll., Diat ., No 215. C. 
ebulliens, var. Cstr., Diat. Ghall. Exped ., p. 159, pi. v. fig. 1. 
Some small specimens from Cambridge deposit show only a single 
band of large markings. This species has sometimes been con- 
founded with C. heteroporus. 
Habitat. — Springfield deposit, Barbados (Schmidt, Grunow) ; 
Maryland (Kinker !) ; Szent Peter deposit (Pantocsek) ; Cambridge 
deposit, Barbados (Greville ! Johnson! Hardman!);* Oamaru 
deposit (Grove!); Barbados (Johnson!);! Nottingham deposit 
(Cleve and Moller !) ; Maryland (Cleve !). 
C. asperulus. Grun., Denk. Wien. Ak., 1884, p. 73. — Diam. '088 
to ‘093 mm. Central space absent. Surface somewhat curvex, but 
with slight slope to the border. Markings polygonal ; towards the 
centre 3 to 3J, at the border 4, in '01 mm.; distinctly punctate. 
* In the collection of Julien Deby, 
t In the collection of Dr Greville. 
