1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 589 
opposite the origin of the shorter rows. Secondary subconcentric 
rows evident on central § of the valve. Border narrow, hyaline. — 
(PI. II. fig. 6.) 
Habitat. — Gazelle Expedition (Weissflog!); lat. 53° 55'S., long. 
108° 35' E., 1950 fathoms, H.M.S. Challenger (Kinker !). 
C. subnotalilis, sp. n. — Diam. -05 to ’075 mm. Surface flat. 
Central space and rosette absent. Markings round, granular, sub- 
equal 7 to 8 in - 01 mm., irregular, on a small indistinctly defined 
central, sometimes slightly excentric area, elsewhere in radial or 
subparallel, irregularly subfasciculate straight or slightly flexuous 
rows ; the rows in each fasciculus parallel to those at its middle or 
side on the same valve ; secondary concentric bands faint ; inter- 
spaces between the rows linear, small and subulate at the origin 
of the shorter rows. — (PI. I. fig. 8 ; PI. II. fig. 18.) 
Distinguished from C. notabilis by the absence of a central space 
and the smaller size of the markings. 
Habitat. — Chalky Mount, Barbados (Firth !). 
Yar. marina , nov. — Diam. - 055 mm. Central space small, 
rounded, with a small central rounded granule. Markings obtusely 
angular, 6 to 7 in ‘01 mm. Border striae evident, 6 in *01 mm. 
Habitat. — Gazelle Expedition (Weissflog !). 
C. Koehii * Pant., Fossil. Bacil. Ung., p. 71, pi. xxii. fig. 197. 
— Diam. *11 to *15 mm. Surface flat to semiradius, two broad low 
undulations on outer half of valve. Central area minute, sur- 
rounded by a narrow dark line. Markings towards the centre 
angular, beyond the semiradius more rounded, subequal, 7J to 8, on 
a distinct band adjacent to the border more crowded, 10 in *01 
mm. ; rows separated by evident clear lines, distinct subulate 
spaces opposite the origin of the shorter rows, and most evident 
towards the centre ; at wide subregular intervals minute clear spaces 
(apiculi ?) close to the border. Border narrow, hyaline. 
Pantocsek’s original specimen is non-fasciculate. Distinguished 
from C. dubiosus by the undulate surface, the more distinctly 
separated radial rows, and the more evident subulate interspaces. 
Habitat. — Szent Peter deposit (Pantocsek !). 
* Dedicated to Prof. A. Koch of Klausenburg. 
