898 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



8. Genus LITHOSERIS Koby. 

 JSS(>. Lillioxcrix KoiiY, Sclnvei/,. I'ahfontol. (4esellsch., Ahliaiid., XIII, p. 338. 



<h'i(j(ii((l (jciwric /■//V/r/;/rAsv'.s'. — "(y()r;illiiiii siinplc, more or les.s ele- 

 vated and turbinate. S(^pta inuneroiis, crowded, little compact {})eii 

 coiiijxtctes)., free maroin divided into irregular ^granulations, septal 

 faces covered with irr(^J;•ular oraiudations. Columella spongy, prom- 

 inent. T^lpitheca complete. Pseudo-synapticula numerous. Dissepi- 

 ments rare.'' 



Type species. — Lithoserts <ji'aeUh Ko])y, Schweiz. Palteontol. Ge- 

 sellsch., Abhand., XIII, p. 3;3S, pi. xciii, lij>-s. 32, 32a. M. Koby in 

 establishing this genus placed two species in it, L. gracU!s and L. 

 coi/ipressa.^ l)oth niuned l)y himself. He did not designate a type spe- 

 cies. I have therefore^ ar])itrarily selected the first. 



Distrihufion. — Jurassic, St. Ursanne, Switzerland. 



Reiiiai'l's. — M. Koby does not take up this genus in his Remarques 

 paleontologiques sur les Polypiers jurassiques de la Suisse." The 

 structure of the wall and septa is not ade(|uately discussed. However, 

 from his placing it near Leptoplnjllhi., one may be justified in thinking 

 that it ditfers from that genus b}" possessing a complete epithcca and 

 a well-developed, prominent columella. 



Ogilvie, in her Korallen der Strambergerschichten,-' })laces Litho- 

 serls in the synonym}^ of Kp)lsf t'ep>f(>p]nilj }t m. Milaschewitz. 



The Nattheim specimens of Ep>!strept<>j>hi/ll>nii. have not, I believe, 

 been sutticientl}- studied for us to know positively the characters of 

 that genus. Lithoseris also needs further study. Howe\er, I will 

 say that an examination of the plates of Milaschewitz and Koby fur- 

 nishes support to Ogilvie's view, but her conclusion can not be 

 accepted as proven. Gregory '' makes observations on the relations 

 of IJthoseris and Ephtrej)top)hyllnni of practically the same import as 

 what is said above. 



9. Genus METETHMOS Gregory. 



1900. Mctctliviox (tkegoky, Juraf^Hic Fauna of Cutch, the Corals, p. 165. 



( yrhjinal (jeiierlc d'uMimms. — '''' Ethiiiot'idiv. in which the corallum is 

 simple, short, conical, and pedunculate. Calice shallow. Septa per- 

 forate near the axis and near the surface, but near the base the pores 

 are closed b}^ stereoplasm. Septa fairly straight and crowded. Den- 

 tate. Synapticulffi scarce. Columella well developed, papillai'y." 



Type species. — Metethmos hlanfordl Gregory, Jurassic Fauna of 

 Cutch, p. 165, pi. XVIII, figs 4-6, 8, 11. 



« Schweiz. Palgentol. Gesellsch., Abhand., XVI. 



i^'Pateontogr., 8up., II, p. 255. 



c Jurassic Fauna of Cutch, the Corals, \). 163. 



