396 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



Dixtr'ihut'tnyi. — Jurassic of India. 



Re))ia7']is. — Gregory gives a lengthy discussion of the affinities of 

 Protethmos."' It is separated from Ephtreptopliylluin Milaschewitz, 

 Lithoser'is Kob}^ (probal)ly a synonym of the former) and Turhinoseris 

 Duncan by these genera probably having imperforate septa. I have 

 pointed out in the present paper that none of them is adequately 

 described. PodoseriH Duncan is said positively to have imperforate 

 septa. 



Gregory does not describe the wall, nor does he state whether epi- 

 theca is present or absent. Figs. 10c and 12c (Plate xviii) show a 

 thick, imperforate wall — such is at least the condition below the upper 

 edge of the calice. Epitheca appears from the figures to be absent or 

 only vestigial. 



6. Genus FRECHIA Gregory. 



1900. Frechia Gregory, Jurassic Fauna of Cutch, Tlie Corals, p. 167. 



Original generic diagnosis. — '"'' Ethmotidx., with a small, simple cor- 

 allum, which is free or pedunculate, trochoid, or cylindrical. Calice 

 variable in depth; generally fairly deep. Septa largely perforate; 

 synapticula^ scarce; no dissepiments. Columella parietal, but well- 

 developed.'" 



Type species. — Freclda cornutiforniis Gregor}^, Jurassic Fauna of 

 Cutch, p. 168, pi. xxi, figs. 1-3. 



Remarks. — This genus is separated from Protethmos Gregory by its 

 more abundantly perforated septa, and from LeptophylUa Reuss by 

 its possessing a well-developed parietal columella. 



Gregory in his generic diagnosis gives no information on the char- 

 acter of the wall, nor as to the presence or absence of dissepiments 

 and epitheca. However, in the description of the type species, P. cor- 

 nutiforniis, he says, ''near the margin of the coral the septa may be 

 united by secondary thickening into an apparent wall." This would 

 indicate an abundantly perforate wall. Judging from Plate xxi, fig. 

 3b, near the base the septa are distally much thickened, forming a 

 thick pseudotheca. Plate xxi, fig. 2, apparently shows dissepiments 

 alongside synapticula. If epitheca is present, it is onh' vestigial. 



7. PHYSOSERIS, new genus.'' 



1873. Trochosmilia Duncan, Quart. Jour. Geol. Soc, Loncion, XXIX, p. 552, 

 pi. XIX, figs. 2, 2a, 3, (not Trochosmilia Milne Edwards and Haime). 



Generic diagnosis. — Corallum simple, subcylindrical or compressed. 

 Epitheca entirely absent or rudimentary. Wall composed of pseudo- 

 thecal thickenings of the septa, or of dissepiments; it is mostly dissepi- 



« Jurassic Fauna of Cutch, The Corals, p. 163. 



'''Illustrations will be published in my fortlu;oniing Tertiarj'^ corals of North 

 America. Part II. U. S. Geol. Surv., IMon., vol. — . [In preparation.] 



