1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 559 
Pritch’Inf.j p. 828; Sell., Atl., pi. lxiii. fig. 11; H. L. Sm., Diat. Spec. 
Typ., Kos. 90, 93, 95; C. oculus-iridis, var. borealis, Cleve, Vega 
Exjped., Vetensk. Jakttag. Stockh., Bd. iii. 1883, p. 488; Grim. 
Denlc. Wien. Ak., 1884, p. 77 (excl. C. borealis, Ehrb., Mon. Ber. 
Ak., 1861, p. 294). 
Distinguished from C. oculus-iridis by the coarser and more 
robust markings. Kitton’s Holies cliff specimens sometimes show 
under low powers 4 minute elevations at the centre, indicating a 
transition to C. excavatus and C. asteroides. 
Habitat.' — Kamstchatka Sea, 1700 fathoms (Bailey !); Kurile 
Islands, 1329 fathoms (H. L. Smith !); Nottingham deposit 
(Kitton!); Sta Monica deposit (Weissflog, Type plate); California 
(Firth,* Grunow); Hong Kong (Weissflog !) Japan (Deby!) ; Napar- 
ima, Trinidad (Johnson !); Sta Barbara deposit (Kinker !); Cambodia 
(Hardman !); f Behring Sea, 1681 fathoms (H. L. Smith !); Holies 
cliff (Kitton !); Barbados (Johnson !); Cape Wankarema (Cleve). 
C. inegajporus. Ehrb., Mon. Ber. Ak., 1861, pp. 280, 294. — 
Diam. about '23 mm. Surface slightly convex. Central rosette 
absent. Markings subequal, 2|- to 3 in *01 mm.; near the border 
smaller, central papillae small. Border broad. 
Probably, as stated by Ehrenberg, a var. of C. borealis. 
Habitat. — Lat. 60° 40' N. long. 29° W. 1000 fathoms ; lat. 62° 
6' N., long. 32° 21' W., 1540 fathoms; lat. 59° 12' N., long. 50° 
38' W., 1833 fathoms (Ehrenberg). 
C. oculis-iridis. Ehrb., Abh. Ber. Ak., 1839, p. 147. Diam. 
T35 to *3 mm. Central rosette distinct, sometimes small. 
Markings polygonal, n on-punctate ; towards the rosette usually 
smaller, from 3 to 4, thence increasing gradually outwards to 2J in 
•01 mm., towards the border again decreasing to 5 or 6 in ’01 mm.; 
central papillae sometimes prominent ; secondary decussating rows 
well marked. Border narrow ; striae 6 in ’01 mm. — Ehrb., Mikrog., 
pi. xviii. fig. 42; pi. xix. fig. 2; Jan., Abh. Schl. Ges. vater. Cult., 
1862, Heft ii. p. 3, pi. i. B. lig. 6 ; pi. ii. A. fig. 4; Gazelle Exjped., 
taf. ii. fig. 2 ; Sch., Atl., pi. lxiii. figs. 6, 7, 9 ; pi. cxiii. figs. 1, 3-5, 
* In the collection of Dr F. W. Griffin, 
f In the collection of Julien Deby. 
