Genus FBOTl^HMOS Gregory 
1900. Protethmos , Gregory, Jurassic Fauna of Cut oh, the Coral®, p. 162 
Generic diagnosis ; "Ethmotida® In which the eomXXum is simpl© 
and short? conical, turbinate, or pedunculate. Septa perforate near 
tha axis and near th© top? granulate j&terally and coarsely denticulate 
above? rather stout, numerous, and usually straight. Synaptricula© , 
scarce. Columella, parietal, spongy? well developed. Calico shallow 
or of medium depth. w 
Type spec les s Frotethaos oldhami Gregory, jogu sup . c|t. , p. 104 
Pi. xvili, figs. 10-13. 
Distributions Jurassic of India. 
r 
Remar ks; Gregory gives a lengthy discussion of the adjdini- 
tie® of Proiethmos (op. sup. clt. , p. 163). It Is separated from 
gpistretophyllum Mii&aoh . » Lithoseris Koby, (probably a synonym of 
the former),, and Turb i no so r i s , b y Duncan by these genera probably hav- 
ing imperforate septa. Hon© of these genera is adequately described. 
Podoserl a Duncan I® said positively to have imperforate septa. 
Gregory does not describe the wall, nor does h® state wheth- 
er epiiheca. is present or absent. Figures 10c and 12c {PI. xvi i i) 
show a thick, imperforate wall « such is at least the condition be- 
low the upper edge of the c&Xics. Spitheca appears from the figures 
to be absent or only vestigial. 
