1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 533 
the centre 6, towards the border 8, in *01 mm. ; the unsymmetrical 
processes 2, larger, obtusely conical, and placed towards the same 
side of the valve ; the clear radial lines less distinct ; long apiculi 
sometimes present within the processes, as in the type. — C. concinnus, 
H. L. Sm., Diat. Spec. Typ., No. 92 ; Eup. jonesianus , Grev.; Cleve, 
Bih. Sv. Vet.-AJc. Handl. , 1873, No. 11, p. 5, H. L. Smith, Diat 
Spec. Typ., No. 163; Eup A commutatus, Grun., and Coscinodiscus 
commutatus, Grun., Denk. Wien. Ak., 1884, p. 79; Van Heurck, 
Typ. Syn. Diat. Belg., No. 490 ; Eup. concinnus, var. triangularis , 
ibid. 
Greville erroneously states that the processes are 3. In triangular 
specimens they occur at the middle of two of the sides. 
Habitat. — Peruvian guano (Grunow) ; Hong Kong (H. L. Smith ! 
Hardman! Grove! Palmer!* Greville!); Yokohama (Hardman!); 
Canton River, Whampoa (Grove !) ; Schleswig (Van Heurck !) ; shell 
cleanings, Singapore (Hardman !);* Sand Heads, Bay of Bengal, 
Ceylon, and edible seaweeds, India (Macrae !);* Port Elizabeth 
(Hardman !) ; Java Sea (Cleve, Grunow) ; surface, Arafura Sea, 
H.M.S. Challenger (Rae !) ; Cherbourg (H. L. Smith !) ; Cux- 
haven, Brazil, and China (Grunow); North Sea (Griffin !); trawled 
at lat. 34° 36' N., long. 140° 22' E., by H.M.S. Challenger (Rae !);f 
Kusu (Cleve ! O’Meara !) ; from Pecten, Penzance (Greville !); Bay of 
Bengal (Macrae!); Tindingen, Greenland (Cleve!); Java (O’Meara! 
Cleve !) ; Cape Wankarema (Cleve !) ; lat. 4° 20' S., long. 105° 22' E. 
(Cleve !). 
Var. Moseleyi, Rattray. C. Moseleyi , O’Me., Quart. Jour. Micr. 
Sci., 1875, p. 330. — Diam. *28 to ‘55 mm. Colour iridescent when 
dry. Central rosette distinct, of large unequal areolae. Markings 
towards the centre 5 to 6, at the border 8, in *01 mm.; rows 
obscurely fasciculate, unsymmetrical ; processes 2, minute ; apiculi 
obscure. Border narrow. — O’Meara, Jour. Lin. Soc. (Bot.), 1877, 
p. 57, pi. i. fig. 6 ; Cstr., Diat. Chall. Exped., p. 153 ; C. concinnus , 
var. kerguelensis , Grun., Denk. Wien. Ak., 1884, p. 79. 
Habitat. — Kerguelen, at 25 fathoms (Rae ! Hardman ! J Peal ! J 
O’Meara, Grunow) ; Royal Sound, Kerguelen (Rae !). 
* In the collection of Dr Greville. 
t In the collection of Dr F. W. Griffin. 
+ In the collection of Julien Deby. 
