1888-89.] Mr John Rattray on the Genus Coscinodiscus. 623 
f Markings minute, delicate 8, towards border re- 
cognised with difficulty, 10 to 12 in *01 mm. ; 
rows radial, oblique rows faint ; no hyaline 
band adjacent to border, Border narrow, 
120.-! hyaline, 
Markings punctiform, 15 in ’01 mm.; rows 
radial. Apiculi distinct in a circlet near 
border, .... 
I Appearance otherwise, 
121 -f-^ 0 rose tte> 
' \ A rosette distinct, 
f A distinct band of large areolae around large 
j central space. Markings punctate 3J in *01 
122. ] mm. , decreasing on outer j of radius. Apiculi 
j at border obvious, .... 
LNo such band, ..... 
124 -f Markings punctiform, 
’ \ Markings larger, .... 
( Markings 13 in ’01 mm. ; rows radial, 
125 J R° ws ra( tial, only a few reaching large central 
' J space, the others mostly ending about £ of 
l radius from border ; interspaces large, hyaline, 
' Markings rounded, granular, 6 in ’01 mm. ; rows 
radial; interspaces wide towards centre, 
Markings obtusely quadrangular, pearly, in- 
creasing to } of radius to 2 or 2J, thence de- 
creasing to border to 3 in ’01 mm. ; irregular 
126.] around centre; rows radial, .... 
Markings obtusely angular, subpearly; towards 
centre 5, at semiradius 4^, at border 8, in ’01 
mm. ; radial rows separated by narrow clear 
lines. Secondary subconcentric rows evident, 
l Markings hexagonal, ..... 
f Markings increasing outwards to f °f radius, 
j towards centre 5, at f of radius 3J in ’01 mm. ; 
] rows radial, at intervals the markings in 
' | isolated oblique rows. Apiculi minute, form- 
ing a circlet at border, ..... 
L Markings not oblique at intervals, 
f Markings towards centre 8, beyond semiradius 4, 
in ’01 mm. ; rows towards border subfascicu- 
128. ] late. Apiculi 2, at an interval equal to about 
[ ^ circumference, ...... 
LNon-apiculate, 
129 . 
( Markings 2| to 3 in ’01 mm., subpearly, with 
central papillae obscure, .... 
Markings towards centre 3 to 3|, increasing out- 
wards almost to border to 2 or 2| in ’01 mm. ; 
rows radial, with secondary rows evident, 
- Markings towards centre 4|, at semiradius 4, in 
’01 mm., smaller at border, . . . . 
Markings 7 to 8 in *01 mm. , decreasing but little 
towards border. Border striae delicate, 
Markings towards centre 6, towards border 8, in 
l ’01 mm. Central space broad diam. ) 
imperator. 
Martonfii. 
121 . 
122 . 
123. 
spinuligerus. 
124. 
125. 
126. 
cingulatus. 
comptus. 
Thumii. 
mossianus. 
notabilis. 
127. 
lutescens. 
128. 
modestus. 
129. 
dubius. 
entoleion. 
flexilis. 
josefinus. 
mirificus. 
