COASTS VISITED BY THE AKCTIO EXPEDITION. 581 



has a wide range in time as well as in space ; it is found in the Lower 

 and Upper Silurian series, ranging from the Caradoc to the Ludlow 

 rocks inclusive, not only in the British Islands, but in Bohemia, 

 Scandinavia, and Bussia. It is now recorded from the Washington- 

 Irving beds (lat. 79° 34'). 



Favosites, sp. 



One specimen of a globose mass resembling an Alveolites is among 

 the other difficult things in the collection to determine ; but the 

 walls of the coraliites are much thicker and the calices more regular 

 than in Alveolites. The tabula? are remote and faintly developed, 

 and the walls perforated apparently in a single row. 



Sp. char. Corallum massive, convex, growing in layers concen- 

 trically arranged ; base concentrically rugose ; calices small, poly- 

 gonal or apparently six-sided ; walls of coraliites thick ; mural 

 foramina or perforations in single lines ; no septa visible. Tabulae 

 thin, distant, and alternating with those of the adjoining coraliites. 



Loc. Cape Louis Napoleon, lat. 79° 38', 



Genus Heliolites, Dana, 1846. 



Heliolites megastojjtjs (M'Coy). 



Palceopora megastoma, M'Coy, Brit. Pal. Foss. p. 16, t. 1 c. f. 4. 



Parties megastoma, IPCoy, Sil. Foss. Irel. p. 62, t. 4. f. 9. 



Heliolites macrostylus, Hall, Pal. N. Y. vol. ii. p. 135, t. 36 a. f. 2. 



H. megastoma, Edw. & Hainie, Mon. Brit. Foss. Corals, Pal. Soc. 

 p. 251. t. 58. fig. 2. 



The slight development of the coenenchyma and large closely-set 

 coraliites (as compared with other species of Heliolites) leads me to 

 believe that this is M'Coy's species. The coraliites are separated by 

 reticulate coenenchyma and possess rather thick tabulae. Hall re- 

 cords this species from the Niagara group under the name of He- 

 liolites macrostylus (Pal. N. Y. vol. ii. p. 135, t. 36 a. f. 2), and it 

 appears also to be the coral referred to by M'Coy under the name of 

 Palceopora megastoma (Brit. Pal. Foss. p. 16, 1. 1 c. f. 4). This coral 

 has a wide distribution, ranging from Britain to North America. All 

 the Petermann-Fiord specimens are glacier-borne from the east. 



Unfortunately the two specimens obtained were not found in situ, 

 but were taken by Dr. Coppinger from the south-west shore of 

 Petermann Fiord on No. 1 glacier, occurring in the talus with other 

 fossils. They are portions of a hemispherical mass or corallum. 



A Pentamerus, allied to P. Verneuili, and Favosites gothlandicus 

 were collected at the same spot. These, like the Bessels-Bay and 

 Offley-Island species, are Greenland forms, and derived either from 

 rocks at the sides of glaciers or brought down from the interior of 

 the country on the glaciers. 



Loc. Petermann Fiord, lat. 81°. 



