562 
Proceedings of Royal Society of Edinburgh. [sess. 
Yar. loculifera , nov. — Diam.. *17 mm. Central space distinct, 
from *0025 to -005 mm. broad, subcircular, usually surrounded by a 
distinct band of large areolae. Markings sometimes most evident 
on a narrow band around the border, the central papillae faint.- — (PI. 
I. fig. 2.) 
This var. is readily distinguished by the central space. Oamaru 
specimens have the band around the central space less evident, and 
the markings towards the centre 5, near the border 3J in *01 mm. 
Habitat. — Manilla Algae (Grove!); Jackson’s Paddock, Oamaru 
deposit (Grove !) ; Springfield deposit, Barbados (Doeg !) ; 
Mejillones (Grove !). 
C. annulatus. Grun., Denk. Wien. Ah. , 1884, p. 74, pi. v. (E), 
fig. 57. — Diam. *08 to *165 mm. Surface with a distinct annular 
depression, about of radius broad, its inner edge about -J- of 
radius from the centre, beyond this slightly convex to the border. 
Central space minute, subcircular ; surrounded by a distinct rosette 
or band of large areolae. Markings pent- or hex-agonal, gradually 
increasing outwards ; near the centre 4, towards the border 3, in ’01 
mm.; on the annular depression the areolae replaced by isolated 
round granules with hyaline interspaces. Border narrow; striae 
delicate, 8 to 10 in *01 mm. 
This species is readily distinguished by the annular depression. 
Habitat. — Mors deposit (Grunow, Deby !). 
C. groveanus* sp. n. — Roundly elliptical, major axis ’21 mm. 
about times minor. Surface flat from the centre for about J- 
of the radius, here rising abruptly to form a distinct elevated ring 
about *01 mm. broad, thence descending more gradually with a 
slight outward concavity to the border. Central rosette distinct. 
Markings hexagonal, subequal, 3J in *01 mm., but near the 
border enlarging to about 2 \ ; central papillae faint ; rows radial, 
straight ; secondary oblique decussating rows most distinct near the 
border. Border striae coarse, indistinct. — (PL I. fig. 11.) 
Distinguished from all others by the prominent elevated ring. The 
transition to G. excavatus , var. semilunaris , Grun., is not abrupt. 
Habitat. — Newcastle desposit, Barbados (Grove !). 
* Dedicated to Edmund Grove, Esq., F.R.M.S., the well-known investi- 
gator of the Oamaru deposit, New Zealand. 
