528 
Proceedings of Royal Society of Edinburgh. [sess. 
Cleve has named C. argus, var. subimpressa , some Oamaru specimens 
that differ from more typical valves only in showing a subfascicu- 
late arrangement of the markings, chiefly visible when the papillae 
are in focus. 
Habitat. — Oran deposit (Ehrenherg, Grunow, Greville!); 
Caltanisetta deposit (Ehrenherg); Bichmond, Va. (Kiitzing); Szent 
Peter deposit (Pantocsek) ; Cuxhaven (Ehrenherg); Carpentaria Bay 
(Schmidt); N. America (Grunow); Banda Sea, 1200 fms. (Hart- 
ing); locality ? (Deby !); Japan (Kinker !); Cambodia (Hardman !); 
Mejillones (O’Meara !); stomach of oysters at Howth (O’Meara!); 
Los Angelos deposit, Cal. (O’Meara!); Cambridge deposit “Barbados” 
(Johnson !* Weissflog ! Hardman !); Canton Biver, Whampoa 
(Grove !); Indian Ocean sounding, by Captain Pullen, 2200 
fathoms (Greville !); Maryland (O’Meara !); Oamaru deposit (Cleve ! 
Grove !). 
Yar. subtraducens, nov. — Diam. *15 to *225 mm. Central space 
absent or minute, rosette absent or obscure. Markings hexagonal, 
increasing from the centre almost to the border ; towards the centre 
4, near the border 3 in *01 mm.; central papillae evident ; secondary 
oblique curved decussating rows distinct. Border narrow ; striae, 5 
to 6 in ’01 mm. — (PI. I. fig. 20.) 
Transitional between C. argus and O. traducens. Specimens 
have sometimes been erroneously associated with O. fimbriatus. 
C. intermedins , Ehrb. ( Mikrog ., pi. xxxiii. 13. fig. 3), may perhaps 
belong to this variety, its markings being figured as more delicate 
than those of C. argus {Mikrog., pi. xxi. fig. 2). Here may also 
come the valve figured by Ehrenberg as C. radiolatus ? ( Mikrog . , 
pi. xxxix. 2. fig. 18), but C. radiolatus , Ehrb. {Mikrog., pi. xxii. 
fig. 4), is distinct (see infra). 
Habitat. — Jackson’s Paddock, Oamaru deposit (Grove !). 
C. traducens, sp. n. — Diam. T mm. Surface flat. Central space 
and rosette absent; a small central area surrounded by a sub- 
circular hyaline line evident. Markings hexagonal, gradually in- 
creasing in size from the central area outwards ; towards the centre 
8, at the border 6 in *01 mm. ; irregular on the central area, 
* In the collection of Dr Greville. 
