1888-89.] Mr John Rattray on the Genus Coscinodiscus. 613 
44. -{ 
45.- 
'Elongated subulate spaces at origin of shorter 
rows. Markings polygonal, without order to 
g of radius, thence obtusely angular, 4 in 
•01 mm., and in radial rows, .... 
Subulate spaces opposite shorter rows. Markings 
12 in ’01 mm. Apiculi some distance from 
border. Inner layer with a zone of costae round 
central space, 
Subulate spaces most evident towards centre. 
Surface undulate beyond semiradius. Mark- 
ings 7| to 8, at border 10, in *01 mm., at wide 
intervals minute clear spaces close to border, . 
L No such appearance, 
Near centre a sharply defined band of 2 rows of 
large areolae. Markings towards centre 4, at 
border 2J, in *01 mm. A distinct rosette, 
No such band, ....... 
^ f Markings resolved with difficulty, 
' \ Markings larger, easily resolved, 
47. 
f Markings 12 in '01 mm.; apiculi scattered at 
J wide intervals over surface, but most crowded 
J towards border, ...... 
L Appearance otherwise, 
49, 
f Markings more delicate, rows radial. 
J with scattered clear dots, 
| A distinct central depression. 
\ evident at its edge, 
Surface 
patelloeformis. 
Baileyi. 
Kochii. 
45. 
intermixtus. 
46. 
47. 
48. 
fragilissimus. 
49. 
pundulatus. 
depressus. 
,o / Markings areolate, .... 
’ \ Markings round, granular or punctiform, 
gQ / Apiculate, 
° \ Non-apiculate, . .... 
50. 
51. 
52. 
53. 
Apiculi 7 to 14, prominent. Markings at centre 
8, increasing outwards to 6, in ‘01 mm., then 
subequal, ....... 
Apiculi 6, large, with slight median constriction. 
Markings 6 to 8 in *01 mm., decreasing near 
border. Rosette minute, .... 
Apiculi 2, asymmetrical at border. Markings 
4 to 5 in - 01 mm., decreasing gradually out- 
wards. A rosette, 
Apiculi prominent, long, acicular, inserted at 
inner edge of border, and reaching its outer 
edge. Markings towards centre 4J to 5, at 
52. semiradius 3 J, near border 4, in ’01 mm. , 
Apiculi prominent, truncate. Markings towards 
centre 4, at semiradius 3, towards border 3|, 
in *01 mm., radial rows inconspicuous, . 
Apiculi scattered irregularly over surface. Mark- 
ings towards centre 8 to 10, towards border 14 
to 16, in *01 mm. Subulate clear lines opposite 
shorter rows, ....... 
Apiculi scattered over surface at irregular inter- 
vals. Markings 8 in ’01 mm., subequal, cen- 
tral dots distinct, ...... 
Apiculi minute, in a circlet at border. Markings 
l towards centre 4, towards border 8, in ’01 mm., 
apiculiferus. 
subaulacodiseoidalis. 
centralis. 
pectinatus. 
egregius. 
dubiosus. 
denticulatus , 
grandineus. 
