516 
Proceedings of Royal Society of Edinburgh. [sess. 
(Ehrenberg, Kiitzing !) ; coasts of Britain (Grove ! Eattray !) ; 
Kirkwall and Eaeroe Islands (Grove !) ; Marstrand (Kinker !). 
Yar. subcequalis. Grun., ibid., p. 72, pi. iii. (C), fig. 3. — Diam. 
•12 mm. Markings as in the type, but subequal almost to the 
border, around which on a narrower zone they are larger than in 
the type. — C. radiatus, var. abyssalis , Cstr., Diat. Chall. Exped ., 
p. 165, pi. xxix. figs. 2, 11, 15; Sch., Atl ., pi. cxiii. fig. 15 (no 
name). 
Castracane’s var. abyssalis , which is not sufficiently characterised, 
is provisionally placed here from his note that the markings gradually 
diminish in size to the border. 
Habitat. — Oran, Monterey and Nancoori Island deposits 
(Grunow) ; Atlantic Ocean, H.M.S Challenger (Castracane) ; 
Monkstown, in tide pool (O’Meara !) ; Cambridge deposit, Barbados 
(Greville !) ; San Diego (Griindler). 
Yar. gladalis. Grun., ibid., Expl. pi. iii (C), fig. 1 ; C. borealis, 
Ehrb., Mon. Ber. Ah., 1861, p. 294 (not C. borealis, BaiL, Amer. 
Jour. Set., 1856, vol. xxii. p. 3). — Diam. *1 to *15 mm. Surface 
flat; central rosette absent. Markings subequal, 3 to 3J decreasing 
to 4 in *01 mm. at the border ; central papillse delicate. — C. radiatus, 
var. borealis, Grun., ibid., p. 72; Sch., Atl., pi. cxiii. fig. 8; C. 
radiatus, Sch., Atl., pi. cxiii. fig. 8. 
The varietal name gladalis given, by Grunow in the explanation 
of his plate, is better than borealis, as it avoids confusion with 
Bailey’s species. 
Habitat. — Lat. 62° 40' N., long. 29° W., 1000 fathoms ; 
lat. 62° 6' N., long. 32° 21' W., 1540 fathoms; lat. 59° 12' N., 
long. 50° 38' W., 1833 fathoms; lat. 58° 3' K., long. 51° 50' W., 
1840 fathoms; lat. 60° 5' N., long. 50° 27' W., 2090 fathoms 
(Ehrenberg) ; Franz Josef’s Land (Grunow ! Cleve !) ; Aegina 
(Schmidt). 
Yar. media. Grun., ibid., p. 72, pi. iii. (C), fig. 2. — Diam. 
*075 to 44 mm. Markings 3J to 4 in '01 mm., gradually decreas- 
ing towards the border, where they are 6 to 6J in *01 mm. — Sch., 
Atl., pi. cxiii. fig. 21; C. radiatus, Sch., Atl., pi. lx. fig. 10 ; C. radio - 
