1888-89.] Mr John Rattray on the Genus Coscinodiscus. 491 
form band adjacent to the border and the crenate appearance of the 
latter. 
Habitat. — Gazelle Expedition (Weissflog !). 
C. fasciculatus. O’Me., Quart. Jour. Micr. Sci ., 1867, p. 245, 
pi vii. fig. 1. — Diam. *0825 mm. Central space circular, distinctly 
defined. Markings areolate, suhequal to the border ; rows fasciculate, 
9 composing each fasciculus and parallel to that at its centre, the 
central radial row only extending to the central space, each adjacent 
pair successively terminating farther and farther from it ; interspaces 
at origin of shorter rows hyaline ; apiculi absent. 
The markings are intermediate in size between those of C. sym- 
metricus and of C. Normani or C. subtilis. 
Habitat. — Dredged off Arran Islands, co. Galway (O’Meara). 
C. echinatus , sp. n. Sch., Atl., pi. lviii. figs. 35, 36 (no names). — - 
Diam. about *03 mm. Central space minute, rosette absent. 
Markings angular, subequal or decreasing gradually from the centre 
outwards, towards the centre 4J to 5, towards the border sometimes 
6 in *01 mm.; rows fasciculate, those in each fasciculus parallel to 
the central row; fasciculi few, 3 to 5. Apiculi large, spine-like, 
interfasciculate, inserted some distance from border. Border sharply 
defined, striae 6 in *01 mm., sometimes obscure. 
Habitat. — Moron deposit (Schmidt). 
C. lentiginosus , Janisch. Sch., Atl ., pi.' lviii.’ fig. 11. — Diam. *075 
mm. Central space absent. Markings round, granular, least 
crowded and with narrow hyaline interspaces towards the centre, 
angular and more crowded around the border ; towards the centre 
6, at the border 8 in *01 mm.; irregular on a small indistinct central 
area, elsewhere in fascisculate rows, those in each fasciculus parallel 
to that at its middle ; a minute apiculus close to the border, readily 
overlooked. Border striae delicate, 16 in *01 mm. — Clove' and Moll., 
Diat ., No. 207 ; C. lentiginosus , var. maculatus, Grun., Cleve and 
Moll., Diat., No. 183. 
A similar spine occurs in C. leptopus and C. hryophilus. Its 
character is distinct from those of Eupodiscus , to which on its 
account it has sometimes been proposed to unite Janisch’s species. 
Habitat. — Patagonia, Antarctic Ocean (Cleve and Moller !) ; 
