532 
Proceedings of Royal Society of Edinburgh. [sess. 
Jour. Micr. Sci ., 1858, p. 20, pi. iii. figs. 12, 12a; Ralfs in Pritch. 
Inf, 828, pi. v. fig. 89 ; Janisch, Gazelle Exped., taf. ii. fig. 6 ; H. L. Sm., 
Amer. Jour. Micr., 1877, No. 8, p. 102; Sell., Ail., pi. cxiii. figs. 8, 
9 ; Cleve and Moll., Diat., No. 215, 319 ; C. ? tenuis , Bail., Boston 
Jour. Nat. Hist., 1862, p. 333, pi. vii. fig. 9; C. centralis, Schulze, 
fide Grunow, Jour. Roy. Micr. Soc ., 1879, p. 688 (excl. Eupodiscus 
gregorianus, de Breb., Jour. Quek. Micr. CL, 1870. p. 41). 
Bailey has seen specimens from Para River with 3 processes, hut 
this species cannot he united to Eupodiscus, as suggested hy Bailey, 
since the character of the processes of the latter is distinct. 
C. concinnus, var. Tcerguelensis, Grun., differs in the markings, 
decreasing outwards from 5 to 7 in '01 mm., and C. concinnus, var. 
arafurensis , Grun., in having a small clear circular central space 
and the markings 9 to 12 in ’01 mm., the clear radii being 
very long. Eupodiscus gregorianus, de Breb., is Eup. subtilis , Greg. 
(Rattray, Jour. Roy. Mic. Soc. Lond ., 1888, p. 915). C. con- 
cinnus agrees with C. centralis, Ehrb., in its two large unsymmetrical 
apiculi, but differs in the degree of fineness and arrangement of the 
markings. 
Habitat. — Peruvian guano (Schmidt) ; Para River (Bailey) ; 
Kerguelen, 25 fathoms (O’Meara, Grunow, Rae!); Baltic (Flogel) ; 
stomach of Pecten, Sussex coast and Kinsale Bay (W. Smith !) ; 
Firth of Clyde (Hennedy) ; Cumbrae (Arnott !); Hull (Ralfs) ; Loch 
Fyne and Inveraray (Gregory !); Ascidia, Hull (Greville ! Gregory !); 
Gorleston (Roper !) ; Caldy, Pembrokeshire (Rev. J. Guillemard) ; 
Humber dredgings (Norman) ; seaweeds, Ballybrack, and oyster 
shells, Dublin Bay (O’Meara) ; San Francisco, Cal. (Firth ! 
Schmidt) ; Helder Algae (Kinker !); Mejillones deposit (O’Meara !) ; 
“Barbados” (Johnson!);* stomach of Pecten, Penzance (Mont- 
gomery!) ;* Nottingham deposit, Cape Wankarema (Cleve and 
Moller ! Grunow!); Schleswig-Holstein (Cleve!); Heligoland 
(Schulze !* Weissflog !) ; Firth of Forth (Grove ! Rattray !) ; Sheer 
ness (Grove !) ; Marstrand (Kinker !). 
Var .jonesiana, Rattray. Eupodiscus jonesianus, Grev., Trans. Micr. 
Soc. Lond., 1862, p. 22, pi. ii. fig. 3. — Rarely triangular. Diam. -21 
to *45 mm. Markings coarser, and more sharply defined ; towards 
* In the collection of Dr Greville. 
