1888-89.] Mr John Rattray on the Genus Coscmodiscus. 625 
nn i Non-apiculate, 
* | Apiculate, 
f Surface with several concentric zones of different 
j and brilliant hues. A broad hyaline band 
} within border. Central space indistinct, 
INo such zones, 
f Near border a circlet of radially elongate clear 
144 -! s P aces - Surface with two concentric undula- 
* | tions. Central space absent, 
l No such clear spaces, . 
"An annular depression about g of radius from 
centre. Central space minute. Rosette 
distinct, ....... 
A wide undulation extending from a short dis- 
tance within the semiradius almost to border. 
Markings towards centre 6|, angular, soon be- 
145 4 coming rounded, and 5| in *01 mm. No hyaline 
’ | band at border. Central space absent. Minute 
hyaline spaces at subregular wide intervals near 
border, ........ 
Undulation faint near semiradius. Markings 
punctiform, delicate, least crowded towards 
centre ; rows substraight, radial, . 
.Appearance otherwise, ..... 
f Alternate or opposite rounded or cuneate eleva- 
tions and depressions around centre. Central 
space absent. A rosette, .... 
I An elongated unilateral depression near centre, 
146. Central space minute, . 
Surface with 6 to 12 shallow depressions near 
centre. Markings at centre 2 to 2|, at 4 radius 
I 3 to 3|, thence increasing to 1^ in ‘01 mm.; 
I smaller at border, ...... 
( A short transverse central plication. Central 
143 -1 s P ace a hsent, ...... 
’ j Two shallow concentric undulations. Central 
l space indistinct, granular, .... 
f Surface hat-shaped, ...... 
' \ Surface with faint undulations, 
"Centre much depressed. Markings punctiform, 
fasciculate. Apiculi prominent, inserted at 
border, . ' 
147. -J Centre less depressed. Markings punctiform, 
j faintly fasciculate, the rows at unequal inter- 
j spaces stopping short of border, and leaving 
l small hyaline areas, ..... 
f Undulation single, about § of radius from centre, 
j Central space indistinct. Markings 7 to 8 in 
148-1 ’^1 mm ' Api cu b small, .... 
’ j Two undulations, one near centre, the other close 
| to border. Markings increasing outwards 
between these, largest on the elevations, 
YOL. XVI. 7/11/89 
142. 
143. 
clivosus. 
144. 
neogradensis. 
145. 
annulatus. 
intumescens. 
pellucidus. 
146. 
excavatus. 
impressus. 
asteroides. 
plicatus. 
undatus. 
147. 
148. 
obnubilus. 
patera. 
bengalensis. 
undiclans. 
2 R 
