548 Proceedings of Royal Society of Edinburgh. [sess. 
minor. Central space absent. Markings without order, but 
around the border smaller, and forming short radial lines. 
Habitat. — Sea of Japan, H.M.S. Challenger (Castracane). 
C. reniformis. Cstr., Diat. Chall. Exped ., p. 160, pi. xii. 
fig. 12. — Reniform, somewhat broader at one end than at the other. 
Major axis *1725 mm., about 2|- times the greatest breadth. 
Central space and rosette absent. Markings polygonal, gradually 
increasing from the centre outwards ; towards the centre 8, at the 
border 6, in *01 mm.; rows straight. 
Grunow correctly notes (Bot. Centralb ., Bd. xxxiv. p. 40) that 
Janisch had named this form Stoschia admirabilis in his still un- 
published manuscript of his report on the Diatoms of the Gazelle 
Expedition. 
Habitat. — ? (Castracane). 
C. sarmaticus. Pant., Fossil. Bacil. Ung., p. 74, pi. viii. fig. 62. 
— Elliptical, major axis ’016 to ‘025 mm., about \\ times minor. 
Central space and’ rosette absent. Markings delicate, punctiform, 
least crowded and most evident towards the centre; radial rows 
obscure ; apiculi 2, minute, inserted at the extremities of the minor 
axis and close to the border, sometimes absent. Border narrow 
but distinct, smooth. 
Habitat. — Dolje deposit (Pantocsek !). 
G. biangulatus. Sch.,^.,pl. lxiii. fig. 1 3. — Diam. *125 to *175 mm. 
Surface slightly convex. Central space and rosette absent. Mark- 
ings decreasing gradually from the border outwards ; towards the 
centre 2 J to 3, towards the border 4, in *01 mm ; central papillae 
distinct ; rows straight, secondary oblique curved decussating rows 
evident. Border sharply defined, from to T T g of radius broad, 
its inner edge with 2 unsymmetrical deep constrictions at an 
interval from each other about equal to the radius ; striae coarse, 
moniliform, 4 or 5 in *01 mm. — C. asteromjohalus , var. biangulata , 
Cleve and Moll., Diat., No. 215. 
Habitat. — Nottingham deposit, Md. (Schmidt, Cleve and Moller !); 
Bermuda tripoli (Greville !) ; Calvert, county Md. (Cleve); Nagy- 
Kurtos deposit, Hungary (Rae ! Deby !) ; Moron deposit (Grove). 
