498 
Proceedings of Royal Society of Edinburgh. [sess. 
C. odontophorus. C. ( subtilis var. V) odontophorus, Grun., Denk. 
Wien. Ah., 1884, p. 82, pi, iii. (C), fig. 24. — Diam. *05 to *175 mm. 
Surface slightly concave at the centre, and convex towards the 
border. Central space and rosette absent. Markings polygonal, 
6 in *01 mm.; punctiform on a distinct narrow zone extending 
outwards from the apiculi, thence gradually becoming more delicate 
and indistinct to the border ; rows irregularly fasciculate, those in 
each fasciculus subparallel to that at its centre, or to a row near 
one of its edges ; secondary oblique decussating rows distinct, most 
evident on the narrow zone at the apiculi ; apiculi prominent, 
inserted at unequal intervals upon or between the outer ends of 
the fasciculi, at a considerable distance from the border. Border 
distinct, narrow ; striae delicate, 8 in *01 mm. 
Distinguished from C. subtilis by the markings and apiculi. 
Habitat. — California deposits (Grunow) ; “ chalk beds between 
White Plains and Hot Spring Station,” California (Grove ! Kinker !). 
C. glacialis. C. ( subtilis , var. 1 ?) glacialis , Grun., Denk. Wien. Ak., 
1884, p. 82, pi. iii. (C), fig. 27.- — Diam. *0215 mm. Surface 
slightly convex. Central space and rosette absent. Markings poly- 
gonal, 15 to 16 in *01 mm., on a small rounded central area, 
irregular, elsewhere forming 8 broad radiating fasciculi ; apiculi at 
border minute, interfasciculate. 
Habitat. — Under side of iceberg, lat. 74° 48' 4” U., long. 54° 52' 
8” E., Aug. 1872 (Grunow). 
C. poly acanthus. Grun., Kong. Sv. Vet.-Ak. Handl. Stockh ., 1880, 
Ho. 2, p. 112, pi. vii. fig. 127.-- Diam. *026 mm. Central space 
absent. Markings polygonal, minute, irregular on a small indis- 
tinct central area, elsewhere in fasciculate rows, the rows composing 
each fasciculus 12, parallel to that at the middle, 15 to 16 in *01 
mm. ; secondary oblique decussating rows faint, apiculi distinct, 
numerous, about 5 in *01 mm., placed upon and between the 
outer ends of the fasciculi. Border narrow, hyaline. — Odontodiscus 
poly acanthus, Grun., ibid., 1880, p. 112. 
Distinguished from C. Rothii and C. odontodiscus by the more 
numerous and stronger apiculi. 
Habitat. — Jamal (Cleve and Grunow); Eranz Josefs Land 
