CLAPP AND SHIMER: SUTTON JURASSIC. 429 
Description of Fossils. 
Isastrea whiteavesi n. sp. 
PI. 40, figs. 9, 10. 
Corallum encrusting; calices irregularly hexagonal, nearly all 
compressed; united to one another directly by thick walls or by a 
coenenchyma across which extend and unite the produced costae of 
the corallites. In the latter case the corallites are less crowded, as 
on the sides where the polyps probably got less food. Calices deep; 
when united their walls are about one millimeter thick. 
Septa, 24 in three cycles; there are indications of a fourth cycle. 
Septal margins apparently granulated. No appearance of a colu- 
mella. 
Diameter of calices 4 to 7 mm., averaging 6 mm.; depth 2 to 3 mm. 
That portion of the coral (/. c, the side) where the corallites are 
embedded in coenenchyma is apparently perfectly continuous with 
the main mass in which the corallites are crowded to a polygonal 
cross-section; the coenenchyma becomes less in amount and the 
corallites more crowded as the upper surface of the coral mass is 
approached. 
Named after Dr. J. F. Whiteaves who alone up to the present has 
described lower Mesozoic fossils from northern Vancouver Island. 
Comparison. — It agrees with /. oblonga (Fleming) ^ from the 
Portland series (Upper Jura) of England in diameter of calices, ar- 
rangement of septa, apparent absence of columella, and resembles it 
in general in shape of corallites, thick walls, and strong lateral granu- 
lations of septa. It differs in the apparently taller corallites, shal- 
lower calices, thicker walls, and less regular hexagonal or pentagonal 
outline of corallites, some being subcircular in cross-section, thus 
indicating a more primitive species. 
Isastrea cowichanensis n. sp. 
PI. 41, fig. 11. 
Corallum encrusting, calices irregularly hexagonal, united to one 
another by relatively thick walls with evidences of coenenchyma 
upon the sides as in /. tvhiteavesi. Calices rather deep (1.5 to 2 mm.), 
diameter about 3 mm.; walls about 0.8 mm. thick. 
> J. Fleming. British Fossil Corals, 1850, pt. 1, p. 73, pi. 12. 
