554 Proceedings of Royal Society of Edinburgh. [sess. 
towards the centre 5 to 6 in *01 mm., often smaller than nearer the 
border, at the border 8 to 9 in -01 mm. 
Habitat. — California deposits, San Diego (Grunow). 
C. obversus , sp. n. Sch., Atl., pi. lx. fig. 14 (no name). — Diam. 
*075 to ‘105 mm. Central space absent or subobsolete ; rosette 
distinct. Markings polygonal, subequal or decreasing slightly for 
about -§■ of radius, thence decreasing more rapidly to the border ; 
towards the centre 2 to 2J, at the border 8, in '01 mm.; central 
papillae distinct ; rows sometimes obscurely fasciculate ; on the 
outer J of the radius the rows are separated by clear radial lines. 
Border narrow, distinct. 
From C. fimbriatus this is distinguished by the larger more 
robust markings and their more rapid decrease from the centre 
outwards. 
Habitat. — Hong Kong (Hardman!); marsh ground, Wedel 
(Schmidt) ; Cambodia (Hardman !). 
Var. tenuior , nov. — Diam. ’0625 mm. Central space and rosette 
absent. Markings subequal to about |- of radius, thence decreasing 
to the border ; at the centre 6, near the border 10, in '01 mm. 
Habitat. — Kio Janeiro (Hardman !). 
C. grandineus , sp. n. Sp. aff. C. concinno , Sch., Atl., pi. lx. 
fig. 16. — Diam. "075 to *19 mm. Surface moderately convex, flat 
on a narrow zone adjacent to the border. Central space absent; 
rosette distinct, sometimes inconspicuous. Markings polygonal, 
decreasing gradually from the centre outwards; towards the centre 
4, towards the border 8, in '01 mm.; rows straight; secondary 
oblique decussating rows manifest; minute apiculi at intervals of 
about *006 mm., sometimes present at the border. Border with 
inner edge indistinct ; strise 4 to 6 in '01 mm. 
This species differs from C. concinnus, var. jonesiana, by the 
absence of apiculi and processes, and from C. aster omphalus, var. 
hybrida, by the absence of a zone of somewhat larger markings 
about the semiradius than nearer the centre. 
Habitat. — Dredged off Heard Island, in 75 fathoms, by H.M.S. 
Challenger (Bae !) ; dredged in Boyal Sound, Kerguelen, 28 
