CLAPP AND SHIMER: SUTTON JURASSIC. 431 
Calamophyllia suttonensis n. sp. 
PI. 40, figs. 5, 7; PI. 41, fig. 15. 
Corallum bushy, consisting of cylindrical tubular corallites which 
grow nearly parallel to one another but slightly diverging. Corallites 
at intervals of from 2 to 4 cm. divaricating at an acute angle and 
usually separated from one another by about a third of their diameter 
but connected by narrow horizontal processes. Exterior surface 
marked by longitudinal costae of three sizes, corresponding to the 
septa and by occasional knobby proliferations from all sides. Epitheca 
apparently absent. 
Septa, 48 arranged in four c^ycles, produced outward forming the 
alternating costae; the first two cycles are equally developed. Col- 
umella apparently wanting. Dissepiments are present but rarely 
preserved. Diameter of calyx, 6 mm. 
Named from the formation. 
Comparison. — This species agrees very closely with C. clathrata 
Emmerich from the Rhaetic of central P]urope (Juravischen province).^ 
It differs, however, in having the first two cycles of septa more 
strongly developed towards the center of the calyx so that fusion of 
adjoining septa frequently occurs; in the latter species the septa 
become much attenuated toward the center, apparently a more 
primitive condition. The thecal proliferations are apparently also 
more numerous and better developed in the former. 
Calamophyllia dawsoni n. sp. 
PI. 40, fig. 1; PI. 42, fig. 16. 
Similar to C. suttonensis in number and cycles of costae and pre- 
sumably of septa (the septa are not sufficiently well preserved to be 
made out with certainty). The corallites are smaller (3 to 3.5 mm. 
in diameter), branch more frequently, are more irregularly diverging, 
and are separated by about their diameter. 
Named in honor of Dr. George M. Dawson who first described and 
defined the Vancouver group of which the Sutton formation is a 
member. 
' p. Freeh. Die Korallen der jui-avischen Triasprovinz. Palaeontographica, 1891, 
vol. 37, p. 15, pi. 4. flg. 111. 
