A systematic Synopsis of the species described. 



Fam. Heliolitidae. 



The corals appertaining to this family as well as the nearly connected one, the 

 Coccoseridaj, are chiefly distinguished by their twelve regular septa, bj^ the individual 

 polypierites composed of an interiör area enclosed within an inner theca and of an exteriör 

 area without any separating wall for each polypierite and forming a differently shaped 

 coenenchyma 



Of systematic essays published in the latest years upon the Heliolitida? may be 

 mentioned first that of Sardeson in his inemoir »Beziehungen der fossilen Tabulaten zu 

 den Alcyonarien» p. 353. His Suborder Helioporidaj embraces the families Heliolitidaj, 

 Plasmoporidas and Halysitidse. Of these the first corresponds with my Heliolitinje if 

 Polytremacis, Heliopora and Sarcophyton be excluded. With my Plasmoporin» his Plas- 

 raopoi'ida3 agree in so far as the genera Plasmopora and Propora are concerned. Lyellia, 

 Pinacopora and Houghtonia are to be removed as they partly are synonyms with other 

 genera and partly belong to other farailies. His third family has certain features resem- 

 bling those of the Heliolitida? but the homology is not ascertained. 



The latest attempt towards a systematic arrangement of this group is by Prof. 

 Frech in »Neues Jahrbuch fiir Mineralogie» etc. 1897 p. 214. We thei'e have the order 

 Heliolithoidea with the families Heliolitidfe, Plasmoporidae and Fistuliporidas. 



I propose to subdivide the Heliolitidas and the Coccoseridae in the following mannar. 



Tribus I. HeliolitinaB. 

 Septa thin, coherent lamells, coenenchyma of polygonal tubes. 



Genus 1. Heliolites. Dana. 

 Coenenchyma monomorph. 

 Species 1. interstinctus L. 



1 a. var. decipiens Mac Coy. 



2. porosus GOLDFUSS. 



3. Barrandei Penecke. 



4. var. spön godes n. 



5. parvistella Ferd. Roemer. 



6. var. intricatus n. 



7. hirsutus n. 



8. fasciatus n. 



