1888-89.] Mr John Rattray on the Genies Coscino discus. 501 
C. margihulatus, Rattray. C. marginulatus , var. gallopagensis, 
Gran, ; Yan Heurck, Syn. Died. Belg., pi. xciv. fig. 30. — Diam. 
•0315 mm. Central space and rosette absent. Markings puncti- 
form ; rows straight, inconspicuous, fasciculate ; those in each 
fasciculus parallel to the central row; at intervals evident, radial 
striae not quite reaching the centre ; apiculi at the border minute, 
at somewhat regular intervals. Border broad, striae evident, 8 in 
•01 mm. 
Habitat. — Galapagos Islands (Van Heurck). 
Var. curvato -striata, Grun. Sch., Atl ., pi. lvii. fig. 5. — Diam. 
•045 to *05 mm. Central space -Jg- to ^ of diam. broad, hyaline. 
Fasciculi numerous, almost straight or curved ; apiculi minute, 
sometimes hardly visible. Border striae 8 to 10 in *01 mm. — Yan 
Heurck, Syn. Diat. Belg., pi. xciv. fig. 32. 
In Moron (?) valves, in Weissflog’s collection, the striae on the 
border are still more delicate, 12 to 14 in *01 mm. 
- Habitat. — Campeachy Bay (Weissflog! Yan Heurck) ; Moron (?) 
deposit (Weissflog?). 
Yar. stellulifera, Grun. Yan Heurck, ibid., pi. xciv. fig. 34. — 
Diam. ’02 mm. Central space as in var. curvato-striata. Fasciculi 
separated around the central space by short straight lines, indistinct 
on the outer half; apiculi less evident. Border striae more delicate. 
Habitat. — Campeachy Bay (Yon Heurck). 
Var. sparsa , Grun. Yan Heurck, ibid., pi. xciv. fig. 31. — Diam. 
•035 mm. Central space absent. Markings irregular; apiculi 
absent. Border striae distinct. 
The var. campechiana, Grun. (Yan Heurck, ibid., pi. xciv. fig. 33), 
from Campeachy Bay, differs only in having evident apiculi at the 
border. 
Habitat. — Campeachy Bay (Yan Heurck). 
C. angulatus, Grev., Trans. Micr. Soc. Bond., 1864, p. 9, pi. ii. 
fig. 11. — Diam. *075 mm. Surface flat, showing an octagonal 
figure at inner edge of border. Central space and rosette absent. 
Markings polygonal, 3J to 4 in -01 mm., slightly smaller at the 
border ; the rows straight parallel to those passing from the centre 
to the apiculi, secondary oblique rows less evident. Apiculi 
