EEUSS COEALS AND BKTOZOA. 7 



" Dachstein-coral " is really acceptable. The genus Lithodendron, 

 into which it has been ranked, is, in itself, inadmissible, and must 

 be abandoned. The free-brauched CalamophylUdece are prevalent ; 

 next to them stand the Thmnnastrcea ; then follow species of Stylma, 

 Isastrcea, Convexastrcea, Confusastrcea, Plesastrcea, AstrceomorjpJia, 

 and one Microsolena, a genus subsequently well represented during 

 the Oolitic periods. No Palseozoic forms have yet been found among 

 the Rhaetic Corals. 



Among the Corals of the Kossen (Rhsetic) strata, ten forms could 

 be generically and specifically determined ; five others admitting only 

 of generic determination. Seven of these species {Rlmhdophyllia 

 hifurcata, Eeuss ; Isastrcea Suessi, E.euss ; Confusastrcea delicata, 

 Eeuss ; Plesastroia tensus, Eeuss ; Thamnastnea Meriani, Stopp. ; 

 Convexastrcea Azzarolce, Stopp. sp. ; and Astrceomorplia JSastictni, 

 Stopp. sp.) come from the " Yoralpe," near Altenmarkt ; the three 

 last having been found in the Lower Lias of Azzarola by Abbate 

 Stoppani, the other four being new species. Three species (Theco- 

 smilia cces2ntosa,^euss; Calamophyllia Oppeli, Eeuss; and Cocconema 

 Sturi, Eeuss) come from the Upper Trias immediately overlain by 

 the Hallstatt limestone. The last-named of these species is the 

 type of a new genus of tabulate Corals, and probably of a new group, 

 allied to the Chcetetince, but diff'ering from them in the imperfect, 

 but fully distinct, development of its septal system. [Count M.] 



On the CoEALs and Bkyozoa of the Matence Basin. 

 By Professor Eeuss. 

 [Proceed. Imp. Acad. Vienna, July 21, 1864.] 

 In 1859 Professor Eeuss described 6 species of these fossils from the 

 Mayence Basin, the first ever published from this locality. Among 

 them were 3 Bcdanoj^hyllice, 1 CaryojjhyUia, 1 Ccenocyathiis (o, genus 

 not known before to occur in a fossil state), and the typical species of 

 the new genus Placopsammia of the gj'oup Eupsammidce. A second 

 collection of Anthozoa and Bryozoa from the lower marine sands 

 of the same locality was (with the exception of Cocnocyathiis costu- 

 latus) entirely composed of new species. The Anthozoa among them 

 are — Caryophyllia Weinlcuvffi,, Stereopsammia granulosa, Blasto- 

 cyatlius indiisiatus, and Map] oheUa gracilis; the last two being repre- 

 sentatives of new genera. The Caryophyllia much resembles the 

 younger Tertiary Sicilian species — C. elegans and C. arcuata. Only 

 one species of the extinct genus Stereopsammia has been described 

 before ; it is from the London Clay. 



The Corals of the Marine Sand of Mayence number at present 10 

 species: b Eupsaimnida', 4 Caryophyllidece, and 1 Acutinidea ; the 

 Astrceidea — so abundant in other localities — seem completely want- 

 ing there. The CaryophyJlia, Coenoryathus, and BalanopdiyUia bear 

 a decidedly Mediterranean facics. The extinct genera, as IlaplohcJia, 

 Blastoci/athns, Stereojtsammia, and J^lacopsammia, occurring all in 

 small-sized individuals, it maj- be inferred tbat the sea in which 

 they lived was rather of a subtropical than of tropical temperature ; 



