KONGL. SV. VKT. AKADEMIENS HANDLINGAE. BAND 32. N:0 I. 67 



I dedicate this remarkable species to Herr Georg Liljevall, who through his great 

 and renowned skill as a draughtsman and the keen perception of his eye has rendered 

 the science so many valuable services. 



Besides the above described species of Heliolites and their synonyms enumerated, 

 there are severaJ other names inentioned, as belonging to that genus. Some of these, as 

 »Hel.» dubius and Hel. Grayi will be met with again as synonyms in other genera. Some 

 others may be independant species, but I cannot describe thein in particular, as I have 

 not seen specimens. 



Such are: Heliol. Daintreei Etheridge and Nicholson, Ann. Mag. N. Hist., v ser., 

 vol. IV, p. 224. 



Heliol. lAasmoporoides E. & N. 1. c. p. 225, both from N. Queensland, Australia. 



Hel.f parasitica Nich. & Etheridge, Girvan, p. 259. 



Hel. foliacea Nich. & Eth. 1. c. p. 261. 



Hel. macrostylus and H. pyriformis J. Hall, Pal. N. York vol. ii, p. 135, i, are 

 probably identical with some of the Silurian species described above, but I have not been 

 able to identify them. 



Heliolites placenta has been described by M. Edw. & Haime as a Devonian species. 

 Its synonymy is the following: 



1826. Coscinopora placenta GOLDF. Petref. Germanice p. 31, pl. 9, fig. 18. 



1850. Geoporites placenta d'Oebigny. Prodrome, I, p. 108. 



1851. Hel. placenta Edw. & H. Pol. pal. p. 219. 

 1860. » * IiD. Hist. N. Cor. III, p. 237. 



1866. Eeceptaculites Neptuni Perd. EoeMEU apud (illEBEL, Repertorium zu GOLDFDSS' Petrefakten Deutsch- 



lands p. 6. 



Professor Cl. Schluter in Bonn has kindly coramunicated, that Goldfuss himself 

 already gave this fossil a new naine in his museum as Receptaculites placenta and he 

 adds that it actually is a Receptaculites and no Heliolites. 



Porites discoidea Lonsdale Sil. Syst. vol. ii, p. 688, pl. 16, fig. 1, låter in Silui'ia, 

 4*'' Ed., p. 510, called Heliolithes discoideus, has long ago been shown to be one of the 

 Stromatoporidte, in 1870 by me in a paper on the »Anthozoa Perforata of Gotland» p. 11 

 (Svenska Vetenskaps-Akademiens Handlingar. Band 9. N:o 6) and in 1886 by Nicholson 

 in his Monograph of the British Stromatoporoids, p. 6 (Palajontogr. Society) who identified 

 it as Stromatopora discoidea. 



According to Gosselet^ a species of Heliolites has been found in the upper division 

 of the Devonian formation at Engis, which locality by the Belgian geologists is placed in 

 the group of the »Calcaire de Fresne», forming the lowermost beds of the Upper Devonian. 

 To judge by the short description annexed by M. Gosselet it is not quite certain that 

 the fossil mentioned is a genuine Heliolites, but it may belong to an allied genus. 



A few other names of Heliolites recur in the list of synonyms amongst species of 

 the Plasmoporina3. 



^ Le Calcaire de Givet, Ann. de la Soc. Géol. du Nord. Torne vi, p. 11. 



