NO. 1401. GENERA OF SIMPLE FIJNOID CORALS— VAUGHAN. 395 



4. Genus HAPLAR^^A Milasche\A^itz. 



1876. Haplarxa Milaschewitz, Palaeontographica, XXI, p. 228. 



Original generic diagnosis. — "Corallum simple, cylindri(3al, attached 

 to the object of support by a broad surface, outside covered l)y a 

 smooth, wavy epitheca. The septa are rather strongly developed, 

 with large pores scattered without order. The younger septa unite 

 with the older, and all the septa are united by numerous and well- 

 developed synapticula. Columella absent."" 



Type species. — Haplarxa elegans Milaschewitz, Palseontographica, 

 XXI, p. 229, pi. LI, figs. 2, 2a, 2b. 



Distribution. — Jurassic, Nattheimer Schichten, Germany. 



Remarks. — Pratz '^ describes a coral, that he refers to Haplarsea., 

 from the Cretaceous of St. Gilgen, on Wolfgangsee. Unfortunately 

 this coral can not be used in defining the genus Ilaplareea. 



Ogilvie in her Korallen der Stramberger Schichten, pages 250, 

 251, apparently bases her remarks on Haplarsea on the work of 

 Pratz, a procedure that is unfortunate, ]>ut her redefinition of the 

 genus (p. 261) does not differ specially from the original definition of 

 Milaschewitz. 



Ogilvie': sredefinition. — "Corallum simple, cylindrical. Septa numer- 

 ous, very perforate, irregularly curved, and abundantly fusing by their 

 sides. Septa often resolved into short, thick trabecule, and forming 

 with the synapticula an irregular, perforate mess work. Pseudos^^n- 

 apticula not numerous. Dissepiments numerous and vesicular. Colu- 

 mella not recognizable. No true wall present, onl}' a pseudothecal 

 thickening of the septal and interseptal skeletal parts near the outer 

 wall. Epitheca thin, wrinkled, reaching to the calicular margin.'' 



Milaschewitz referred Ilaplarxa to the Poritidx; Zittel^' placed it 

 with CaJostylis in the Enpsammidse. Ogilvie followed Zittel, Greg- 

 ory'" places it in his Ethinotidm. 



5. Genus PROTETHMOS Gregory.'^ 



1900. ProtethmoK, Gregory, Jurassic Fauna of Cutch, Tlie Corals, p. 162. 



Original generic diagnosis. — '"'' Ethniotidm in which the corallum is 

 simple and short; conical, turbinate, or pedunculate. Septa perforate 

 near the axis and near the top; granulate laterally, and coarsely den- 

 ticulate above; rather stout, numerous, and usually straight. Synap- 

 ticula3, scarce. Columella, parietal, spongy; well developed. Calice 

 shallow or of medium depth." 



Type species. — Protethnios oldhami Gregory, Jurassic Fauna of 

 Cutch, The Corals, p. 164, pi. xviii, figs. 10-13. 



« Verwandscaftliche Beziehungen einiger Korallengattungen, pp. 102, 103. 



^'Handb. Palaontologie, I, 1880, p. 242. 



''Jurassic Corals of Cutch, p. 162. 



''If the wall of this genus is imperforate it should be placed near Gyrosesia. 



