472 Proceedings of Royal Society of Edinburgh. [ sess . 
sometimes found. Not a Pyxidicula , as suggested by Grunow 
( Denk. Wien. Ak., 1884, p. 73). 
Habitat. — Californian guano (Norman!)*; stomach of Ascidia, 
Hull (Greville !) ; Lamlash (Greville ! ); Caldy, Pembrokeshire 
(Roper !) ; Hull (Firth !) f ; Humber (Dickie !) ; California (Cleve 
and Moller !). 
C. bipartitus , sp. n. Sch., Atl., pi. lix. fig. 35. — Diam. about 
•0875 mm. Central space absent, rosette large, surrounding a 
single small circular areola. Markings hexagonal, 2J subequal, for 
about J of radius, on outer \ 6 in *01 mm., forming a distinct 
band. Central papillae absent, radial rows on inner J of radius 
obscure, the oblique decussating straight rows manifest, on outer 
\ the radial rows evident, the secondary oblique decussating rows 
uniformly curved. Border narrow, hyaline ; beyond the border 4 
large unsilicified subrugose blunt protuberances. 
Habitat. — Java (Griindler). 
C. blandus. Sch., Atl., pi. lix. figs. 36, 37. — Diam. about ’07 mm. 
Central space small, rosette large, at the inner angles of its 
component areolae distinct minute round granules. Markings 
hexagonal, 3 in *01 mm., somewhat smaller towards the periphery ; 
the central papillae faint, a distinct band sometimes present adjacent 
to the border, upon this the markings rounded granular and irregular 
apiculi numerous, inserted at inner edge of border. Border narrow ; 
striae evident, 6 in *01 mm. 
Habitat. — Gulf of Mexico (Schmidt). 
C. lineatus. Ehrb., Abh. Ber. Ak, 1838, p. 129. — Rarely angular. 
Diam. *05 to *15 mm. Surface towards the centre flat, slightly 
convex near the border. Central space and rosette absent. 
Markings hexagonal, 2J to 4 in '01 mm., subequal, or sometimes at 
border 6 in -01 mm., their central dots distinct ; apiculi small, 
sometimes absent. Border distinct, consisting of a few concentric 
rows of contiguous granules, 8 or 9 in ‘01 mm. — Ehrb., ibid., 1841, 
p. 371, pi. i. 3. fig. 20 ; pi. iii. 7. figs. 7, 8; Mikrog., pi. xviii. fig. 
33; pL xxii. figs. 6a, b; pi. xxxv.a, 16. fig. 3; pi. xxxv.a, 17. fig. 7; 
In the collection of Dr Greville. + In a slide prepared by Mr Norman. 
