38 G. LINDSTRÖM, HELIOLITID^. 



Descriptions of Genera and Species. 



Tribus I. Heliolitinae. 



This tribe comprises those genera which as a rule have twelve septa in the cali- 

 cular area, being coherent lainella;, more or less spiny on their margin. Regular tabulte 

 in the calicular tubes as well as in the tubes of the coenenchyma, which latter have a 

 polygonal shape. According to the structure of this coenench3ana joint with other diffe- 

 rences, as closer indicated in the descriptions further down, three genera may be discerned. 



1. HelioUtes, Dana, with monomorphous coenenchyma or all its tubes equalsized 

 and polygonal. 



2. Cosmiolithus nov. gen. with dimorphous coenenchyma or tubes of two difife- 

 rent kinds. 



3. Proheliolites, Kimb., with very scarce coenenchyma, septal spines, unlike all 

 others in this family, bent downwards. Coenenchymal gemmation from single tubes. 



Genus HelioUtes, Dana. 



Synonyms. 



1745. Millepora p. p. L. Cor. balt. p. 30. 



1767. Madrepora p. p. L. S. N. ed. XII p. 1276. 



1826. Astrtea p. p. GOLDFUSS. Petref. Germ. p. 64. 



1833. Heliopora p. p. Steininger. Mém. Soc. Géol. do Frauce p. 346. 



1839. Porites p. p. LONSDALE. Sil. Syst. p. 686. 



1845. Pixplanai-ia Gbinitz. Grnndriss d. Verstein. p. 568. 



1846. HelioUtes Dana. Zoophyta, Un. St. Expl. Exp. p. 541. 



1849. Lonsdalia D'Orb.^ Note sur les polyp. foss. p. 12. 



1850. Fistulipora p. p. Mac Coy. An. Mag. N. H. Ser. 2, vol. 6, p. 285. 

 1850. Palseopora p. p. MAC COY. Ibid. 285. 



1850. Geoporites D'OEBlGNy. ^ Prodrorae, p. 49. 



1895. Stelliporella Wbntzel. Zur Kenntuiss der Zoantharia tabnlata p. 27. 



1895. Pachycanalioula Id. Ibid. p. 27. 



Dana is the real author of this genus, but the name had been used long before 

 by GuETTARD. This author, however, in his »heliolithe» joined a great number of dissi- 

 milar and not at all congeneric forms. The conception Avhich Dana gave of the genus 

 is the only true one. 



Of the name Heliolites, from which also that of the family has been formed, as 

 from the longest known and the most typical of all its congeners, I cannot lind any 

 earlier notice before Guettard employed it in 1770 in his »Mémoires sur différentes 

 parties des Sciences et Arts», vol. 2 p. 284, where he says that he has »adopté le mot 

 d' heliolithe» for such stones which have »des rayons comme le soleil». He evidently 

 therewith meant to say, that he had adopted an earlier name, the more so as he in 



' Accurdi)ig to Milne Edwards & Haime. r)'ORBiGNY's descriptions are too iusnfficient to find what 

 he inteiided. 



