560 
Proceedings of Royal Society of Edinburgh. [sess. 
20 ; Raben., Alg. Europ ., Nos. 2487, 2558 ; Cleve and Moller, 
Diat ., Nos. 3, 57, 162, 215, 258, 259, 276, 319 ; C. ocidus-iridis , 
var. genuina , Grun., Denk. Wien. Ah, 1884, p. 77 ; C. centralis, 
Ehrb., Mikrog., pi. xxi. fig. 3 ; H. L. Sm., Diat. Spec. Typ., No. 92 ; 
C. omphalanthus, Gran., in Sell., Atl., pi. lxiii. fig. 2. 
Grunow believes that C. oculus iridis, var. ? pacifica, may belong 
to C. aster omphalus, the pnnetation of the markings having escaped 
Schmidt’s observation. The specimen figured by Schmidt (Atl., 
pi. cxiii. fig. 1) shows a less obvious increase of the markings 
outwards, and a more distinctly marked zone adjacent to the border ; 
but gradations occur to such forms, as shown in fig. 3 of same plate. 
Habitat. — Franz Josef’s Land (Grunow !); Cherbourg (H. L. 
Smith!); Liimfiord, Jutland (Hardman!); mud from Gluckstadt, 
Elbe above Cuxhaven (Rabenhorst and Schwarz !); Aegina 
(Schmidt); Bohuslan, and mud from Elbing, West Prussia (Cleve !); 
Java (Schmidt, Cleve and Moller ! O’Meara !); Japan (Deby !) 
Inland Sea, -Japan, H.M.S. Challenger (Bae !) ; Arafura Sea, 
H.M.S. Challenger ! (Doeg !); Japan oysters (Doeg !); Hong Kong 
(Deby ! Hardman ! Greville ! Grove ! Firth !); surface, Hong Kong 
Harbour, H.M k S. Challenger (O’Meara !) ; Isle of Muntok, Indian 
Archipelago (Grove !); Sand Heads, Bay of Bengal (Macrae !) ; shell 
cleanings, Singapore (Hardman !); Ceylon (Macrae !) ; edible sea- 
weeds, India (Macrae !); East Indies (Macrae !); Spitzbergen, 
Santos (Clevej; Cape W T ankarema (Cleve and Moller!); Greenland 
(Cleve !) ; Penang Plarbour (Bae !) ; Kusu (Cleve ! O’Meara !) ; 
H.M.S., Challenger, lat. 32° 31' N., long. 135° 39' E., 1675 fathoms 
(Bae !) ; Atlantic Telegraph soundings (Boper !) ; North Atlantic, 
lat. 51° 20' N., long. 52° 25' W., 232 fathoms (O’Meara!); “Atlantic 
sounding” (Weissflog!); Sea of Kamstchatka, 1700 fathoms (Bailey!); 
Nancoori, Pensacola, Trinidad, California (Cleve and Moller !) ; 
Cambodia (Hardman !) ; marine deposit, Fiji Islands (Grove !) ; 
Patagonian and Ichaboe guanos (Janisch) ; Lobos di Afuera guano 
(Grove !) ; Peruvian guano (Hardman ! Cleve ! Janisch) ; Bolivian 
guano (Cleve ! Greville !) ; “guano ” (O’Meara !) ; Patos Island 
guano (Greville !) ; Californian guano (Greville !) ; Baytha, Elesd, 
Also-, Felso-, Esztergaly, Kekko, Mogyorod, Szakal, Szent-Peter 
and Dolje deposits (Pantocsek !) ; Moron deposit (Greville !) ; Brlinn 
Tegel (Cleve !) ; Mors (Cleve) ; Monterey (Stokes !) ; Santa Maria 
