1888-89.] Mr John Rattray on the Genus Coscinodiscus. 497 
1880, No. 2, p. 115.— Diam. *044 mm. Markings more delicate, 
15 to 16 rows in *01 mm., irregular on a small central area; 
fasciculi numerous, each consisting of about 12 rows ; apiculi 
absent. 
This forms transition to C. glacialis. 
Habitat . — Jenissey (Cleve and Grunow). 
Var. lineolata , nov. — Diam. *0575 mm. Central space subcircular, 
from this a single narrow straight line passing to the border and at 
intervals of about J of the surface, two other pairs of straight rows 
in contact with one another. Markings in irregular inconspicuous 
fasciculi; apiculi at the border, inter-fasciculate; indistinct. — (PI. I. 
fig. 16.) 
Grunow has regarded this var. as an abnormal form of C. subtilis. 
Habitat. — Mors Island (Weissflog !). 
Yar. scabra, nov. — Diam. '0375 to *055 mm. Central space 
absent. Markings 12 to 14 in '01 mm., somewhat smaller towards 
the border ; fasciculi inconspicuous ; apiculi few, indistinct at wide 
intervals, not between each pair of fasciculi ; minute scattered 
hyaline specks (apiculi 1 ?) most numerous towards the centre. — 
(Pl. III. fig. 6.) 
Habitat. — Nancoori (Weissflog !). 
C. whampoensis. Grove M.S. — Diam. *075 mm. Surface with 
a distinct narrow elevated ring about § of the radius from the 
centre. Central space and rosette absent. Markings hexagonal, 
decreasing slightly towards the border; towards the centre 8 to 10, 
towards the border 12 in "01 mm. ; irregular on a minute round 
central area, elsewhere in substraight fasciculate rows, deflected 
slightly near the border, those in each fasciculus parallel to that at 
or near its middle ; apiculi minute, inserted at the border at wide 
intervals of -0175 mm. or more, between or upon the fasciculi. 
Border narrow, hyaline. — (PI. I. fig. 24.) 
The elevated zone, the less regular appearance of the fasciculi at 
their outer ends, and the distant apiculi, distinguish this species 
from C. subtilis and G. Rothii. 
Habitat. — Canton River, Whampoa (Grove !). 
YOL. xvi. 25/10/89 2 I 
