518 
Proceedings of Boyal Society of Edinburgh. [sess. 
Var. irregularis , Gran. Van Heurck, Sign. Diat. Belg., pi. cxxix. 
fig. 1. — Obtusely triangular, sometimes elliptical. Diam. about -105 
mm. Markings 5^ to 6 in -01 mm., subequal almost to tbe border ; 
radial rows straight or curved, evident. 
This var. is distinguished from var. glacialis by the size of the 
markings and the arrangement of the rows. Transitional to the 
untenable genus Stoschia. 
Habitat. — Naparima deposit (Yan Heurck). 
Yar. crenidata , Rattray. C. radiatus , var., Wallich, Trans. Micr. 
Soc. Lond., 1860, p. 48, pi. ii. fig. 22. — Diam. about *025 mm. 
Markings sub-equal. Border crenate. 
Habitat. — From Salpce, Indian Ocean (Wallich). 
C. luctuosus , Grove MS. — Diam. *0875 to *125 mm. Surface 
rising gradually from centre to about semiradius, thence descending 
with a similar slope to border, convex. Central space and rosette 
absent. Markings at centre obtusely angular, soon becoming acutely 
angular and areolate, subequal, 3J in *01 mm.; rows straight. 
Border sharply defined, Jg- to -fa of radius broad ; striae obvious, 5 to 
6 in *01 mm. — (Plate III. figs. 8, 9.) 
Habitat. — Troublesome Gully, Oamaru (Grove !). 
C. compositus , Rattray. Sp. n.? Sch., Atl., pi. lix. fig. 10. — Diam. 
*023 mm., central space and rosette absent. Markings angular, 
towards the centre about 6 in ’01 mm., decreasing slightly towards 
the border, central dots absent; rows inconspicuous, secondary 
oblique rows obscure. Border sharply defined, about i of radius 
broad ; striae evident, about 4 in ’01 mm. 
Habitat. — Nottingham (Schmidt). 
C. egregius , Rattray. Sp. nl Sch., Atl., pi. lvii. fig. 39. — Diam. 
•03 mm. Central space and rosette absent. Markings angular, increas- 
ing to about semiradius, thence decreasing gradually to the border ; 
towards the centre 4, at semiradius 3, towards border 3J in ‘01 mm ; 
central dots evident, radial rows inconspicuous, secondary curved 
rows evident ; a distinct sharply defined band with faint striae 6 in 
*01 mm. adjacent to border, prominent truncate, but small markings 
