1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 517 
latus, Sch., Jahresb. d. Kom. z. Untersuch. d. deutseh. Meer , Kiel , 
1874, p. 94. 
Schmidt, in 1878, stated that this form is the traditional type of 
C. radiatus , Ehrb., but in Ehrenherg’s original definition the mark- 
ings are given as about 2 in ’01 mm. Los Angelos specimens have 
been observed by Grunow occasionally to have on their valves 
groups of larger markings, forming 4- to 6-angled rosettes. 
Habitat. — Atlantic sounding for telegraph cable (Greville!); 
Oran, Nancoori and Los Angelos deposits (Grunow); King’s Bay, 
Spitzbergen, 160 fathoms (Cleve) ; Davis Straits (Cleve) ; Franz 
Josefs Land (Grunow); Baltic (Schumann); Gulf of California (H. L. 
Smith!); Sussex (Dickie!); Cambridge deposit, Barbados (Hard- 
man !);* Peruvian guano (Hardman !);* Lumfiord, Jutland (Hard- 
man !);* Nottingham, U.S. (Hardman !);* Compeachy Bay (Hard- 
man !); Rio Janeiro (Hardman !); Californian guano (Norman !);f 
Teignmouth (Arnott !);f Melville Bay, lat. 75° 27' N., long. 64° 
34' W. (O’Meara !); Nottingham deposit (Hardman !);* Lamlash 
Bay (Dickie ! Gregory !);f Ascidia, Belfast (O’Meara !); Maryland 
(O’Meara !); Mejillones deposit (O’Meara !); rice fields, Georgia 
(Greville !); Gulf of Mexico (Schmidt); Algeria (Arnott !); Indian 
Ocean soundings, Capt. Pullen, 2200 fathoms (Greville ! Roper !);f 
shell cleanings from Singapore (Hardman !);f Bay of Bengal 
(Macrae !) 
Yar. minor. C. radiatus f. minor , Sch., Jahresb. d. Kom. z . 
Untersuch. d. deutseh. Meer , Kiel , 1874, p. 94, pi. iii. fig. 34. — 
Diam. *03 to *0525 mm. Markings 4 in *01 mm. at the centre, 
decreasing to 8 to 9 in *01 mm. at the border, the radiating rows 
less obvious. Border strise, 6 to 8 in *01 mm. — C. radiatus, var. 
parva, Grun., Sitzungsb. Naturw. Ges. Ids , Dresden , 1878, p. 124, 
pi. iv. fig. 16 ; C. devius, Sch., Atl., pi. lx. figs. 1-4 ; Van Heurck, 
Syn. Diat. Belg., pi. exxx. fig. 3 ; Cleve and Moller, Diat ., 
No. 150. 
Habitat. — Peruvian guano, Rio de Janeiro, Santos, Campeachy 
Bay, Japan, and Baku Harbour, Caspian Sea (Grunow); Hvidingsoe 
(Schmidt); Nancoori (Hardman!);* Manilla (Hardman!).* 
* In the collection of Jnlien Deby. 
t In the collection of Dr Greville. 
