1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 505 
denarius , var., Sch., Atl., pi. lvii. fig. 22 .; C. (symmetricus, var.) 
denarius , Sch., Cleve and Gran, in Moll., Diat ., No. 183. 
The fasciculi sometimes do not reach the centre, because of the 
extension inwards of the rows belonging to the adjacent fasciculi. 
Distinguished from C. subtilis by the larger more uniform markings. 
Habitat. — Springfield deposit, Barbados (Doeg ! Schmidt !) ; 
Campeachy Bank, Sansego (Schmidt); Cambridge depo.sit, Barbados 
(Greville !); Chalky Mount, Barbados (Firth !); * Antarctic Ocean 
(Cleve and Moller !). 
Var. variolata. C. variolatus, Cstr., Diat. Chall. Exped., p. 155, 
pi. ii. fig. 5. — Diam. *068 mm. Surface spotted at wide irregular 
intervals with small groups of more prominent granules. Border 
narrow, hyaline. 
Habitat. — Phillipine Islands, H.M.S. Challenger (Castracane). 
Coscinodiscus ? Ehrb., Abh. Ber. Ak ., 1871, p. 140, pi. i. (B), 
fig. 20. — A minute fragment showing closely placed angular 
markings in straight fasciculate rows, which are parallel to that at 
the centre of the fasciculus. Border hyaline, distinct. 
In the second edition of Habirshaw’s Catalogue, this is associated 
with a valve indicated as Coscinodiscus , sp.1 Sell., Jahresb. d. 
Kom. z. TJntersucli. d. deutsch. Meer, Kiel , 1874, p. 95, pi. iii. fig. 
42), but it is more nearly allied to C. denarius , var., Sch. (Atl., 
pi. lvii. fig. 19), from Sansego. 
C. senarius. Sch., Atl., pi. lvii. fig. 24. — Diam. '04 mm. Central 
space absent. Markings polygonal, equal, 4 in *01 mm.; rows 
fasciculate, those composing each fasciculus parallel to that at its 
middle, the interfasciculate rows most prominent; secondary 
oblique decussating rows straight, non-apiculate. Border narrow, 
striae delicate, 12 to 14 in '01 mm. — Janisch, Gazelle Exped., taf. 
vi. fig. 5. 
Habitat. — Springfield deposit, Barbados (Schmidt). 
C. partitus. Grove and Sturt MS. — Diam. -05 mm. Central 
space minute, rosette absent. Markings subactinocycloid, rounded, 
granular, towards centre 6, towards border more crowded, sub- 
punctiform, 8 in '01 mm.; rows straight, fasciculate, inconspicuous, 
