1888- 
101 . < 
103. - 
104. 
106. 
107. 
108. 
105. 
109. 
110 . 
-89.] Mr John Rattray on the Genus Coscinodiscus. 
r Markings 6 in *01 mm. ; rows radial, separated 
by wide hyaline intervals ; adjacent to border 
a distinct band, with markings similar to those 
on rest of valve, ...... lunce. 
Markings minute, granular, faint beyond semi- 
radius, radial rows distinct, .... stelliger. 
Marking minute, granular, most distinct 
towards centre, beyond semiradius puncti- 
form ; rows radial. Border sharply defined, . exiguus. 
Markings punctiform ; rows radial, interspaces 
widest opposite shorter rows. Adjacent to 
border a band of large faint areolse. A few 
scattered prominent round granules on a 
circlet some distance from border and one at 
centre, . perminutus. 
L Markings otherwise, ...... 103. 
Adjacent to border a distinct band, with smaller 
markings than on rest of valve, 
No such band, ....... 
104. 
105. 
f The marginal band narrow, .... 106. 
I The marginal band broad, .... 107. 
{ Central space elongately elliptical. An undula- 
tion at semiradius, with inner edge less abrupt 
l than outer, ....... undulatus. 
f Markings rounded, granular, 4 to 4| in *01 mm. 
| Interspaces hyaline, large opposite shorter 
| rows, elegans. 
j Markings 6 in '01 mm. A marginal hyaline 
l band. Apiculi distinct, .... tabularis. 
( Rows radial, less crowded, and prominent within 
a distinct marginal band, .... actinochilus. 
No such appearance, 108. 
f Markings towards centre 3 J, at semiradius 3, at 
border 6, in ’01 mm. Central space irregular, 
4 small ; rows radial, secondary rows indistinct, cribrosus. 
j Markings obtusely angular ; central space sub- 
L quadrate. Border hoop-like, strise evident, . aethes. 
C Apiculate, 109.' 
\ Non-apiculate, 110. 
f Apiculi large, distant, inserted some distance 
within border. Markings rounded or obtusely 
angular; towards centre 6, towards border 
8 to 9, in ‘01 mm., and punctiform; secondary 
rows most evident near border, . . . hungaricus. 
Apiculi minute. Markings 6 in ‘01 mm., de- 
creasing slightly near border ; rows radial, 
l_ interspaces narrow, ..... griseus. 
( Markings rounded, granular, about 5 in *01 mm. , 
conspicuous, decreasing rapidly from centre out- 
I wards, towards border punctiform, more faint ; 
j rows radial, ....... 
] Markings rounded, granular, near border puncti- 
form ; without order, ..... 
| Markings rounded, granular; interspaces hyaline, 
l unequal; rows radial, ..... 
gemmifer. 
confusus. 
111 . 
