530 
Proceedings of Royal Society of Edinburgh. [* 
space and rosette absent. Markings hexagonal, minute, subpuncti- 
form, smallest and most crowded towards the border ; towards the 
centre 8 to 10, towards the border 14 to 16 in *01 mm.; secondary 
rows slightly oblique or irregularly subconcentric, the latter more 
evident near the centre, narrow radial subulate clear lines opposite 
the origin of the shorter rows ; clear irregularly disposed puncta 
sometimes evident. Border narrow; striae, 10 to 12 in - 01 mm. 
— Cleve and Moll., Diat ., No. 164; Janisch, Gazelle Exped ., 
taf. v. figs. 10, 11. 
This species sometimes approaches Podosira hormoides, Mont. 
(Van Heurck, Syn. Diat. Belg ., pi. lxxxiv. figs. 3-6), but the 
markings are not in fasciculate rows. In Podosira liormoides 
Grunow has noted that the markings are grouped in almost radial 
lines (Sitzungsb. naturw. Ges.Isis, Dresden , 1878, p. 33). 
Habitat. — Oamaru deposit (Grove! Doeg!); California (Arnott!);* 
Monterey deposit (Hardman ! * Cleve !); Sta Monica deposit (Cleve 
and Moller !); Java (Cleve !); Successful Bay, Kerguelen (Cleve !). 
Yar. curvans , nov. — Diam. T1 mm. Markings similar, but 
numerous hyaline subulate spaces towards the centre; the rows 
uniformly curved between centre and border, radial ; the secondary 
rows but slightly oblique or almost parallel to the border. 
Habitat. — Troublesome Gully, Oamaru (Grove !). 
C. plicatus , Grun. Sch., Atl ., pi. lix. fig. 1. — Diam. -0425 to 
*05 mm. Surface with a short transverse central plication. Central 
space absent. Markings polygonal, increasing from the centre 
outwards, again decreasing slightly at the border; towards the 
centre 7, towards the border 6 in *01 mm.; a circlet of evident, but 
small, apiculi at the border. — Grun., Denk. Wien. Ah, 1884, p. 73, 
pi. iii. (C), fig. 10.; Cleve and Moll., Diat., Nos. 114, 276. 
Habitat. — Polycistinous rock, Nancoori (Cleve ! Grunow, 
Schmidt, Hardman !) ; f Mascara and California (Cleve and 
Moller !). 
C. corolla. Sch., Atl., pi. lviii. fig. 32. — Diam. -047 mm. 
Central space and rosette absent. Markings polygonal, 8 to 10 in *01 
* In the collection of Dr Greville. 
t In the collection of Julien Deby. 
