1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 599 
C. gracilentus, sp. n. — Elongately elliptical, the extremities 
bluntly cuneate. Major axis - 095 to '125 mm., about 5J times 
minor. Central space and rosette absent ; a circular central area 
about -006 mm. broad, with irregular angular granules, and bounded 
by a narrow hyaline line. Markings hexagonal, 4|- to 5 in ‘01 mm., 
somewhat smaller around the border ; rows curving outwards from 
the central area, and continued almost parallel to the major axis 
almost to its extremities, near the latter diverging outwards ; irregular 
along the minor axis. Border narrow, hyaline. — : (P1. I. fig. 9.) 
Habitat. — Naparima, Trinidad (Weissflog ! Firth !). 
§ VIII. COCCONEIFOUMES. 
Valves roundly elliptical. Markings cocconeoid. 
C. cocconeiformis. Sch., Atl ., pi. lviii. figs. 25, 26, 28. — Diam. 
*023 to '035 mm. A narrow hyaline band, sometimes tapering 
towards the extremities running from the centre towards the border. 
Markings small, round, granular, crowded on a narrow, sometimes 
distinctly defined hand adjacent to the border ; rows straight from 
the centre at right angles to the hyaline band, elsewhere diverging 
and slightly curved towards the extremities of this hand; inter- 
spaces hyaline. 
Distinguished by the arrangement of the markings. 
Habitat. — Monterey (Schmidt, Weissflog !) ; Sta Marta deposit 
(Roeg !). 
Var. latio7\ nov. Sch., Atl., pi. lviii. fig. 23 (no name). — Sub- 
circular. Diam. '0165 mm. Central hyaline hand extending 
close to the border, its sides convex with a slight median con- 
striction. Markings more minute, irregular, rows undifferentiated, 
the hand adjacent to the border absent. 
Habitat. — Campeachy Bay (Schmidt). 
Var. brevior , nov. Sch. Atl., pi. lviii. fig. 24 (no name). — 
Diam. *038 mm. Central space small, roundly elliptical. Mark- 
ings subequal, or decreasing slightly towards the border, in more 
evident diverging rows. Border narrow, formed by two concentric 
hands of granules. 
Habitat. — Cape of Good Hope (Schmidt). 
