582 E. ETHEKIDGE ON THE PALAEONTOLOGY OF THE 



Genus Alveolites, Lamk. 1801. 

 Alveolites, sp. 



Two specimens of an Alveolites occur amongst the coral-fauna, 

 one from Cape Erazer and the other from Cape Louis Napoleon, 

 east of Dobbin Bay in Grinnell Land. Considering the number of 

 known species in this genus in the Silurian and Devonian rocks of 

 America and Europe (about thirty), it is singular that we have no 

 better representatives than the two recorded. 



I cannot refer them to any British species, owing to their bad 

 state of preservation. 



Loc. Cape Erazer, lat. 79° 45', and Cape Louis Napoleon, lat. 79° 38'. 



Genus Halysites, Fischer, 1813. 

 Catenipora, Lamarck, 1816. 

 Haltsites catenttlattjs (Linn.). 



Tubipora catenularia, Linn. Syst. Nat. 12th ed. vol. i. p. 1270. 



Halysites catenularia, M.-Edw. & Haime, Mon. Brit. Eoss. Corals, 

 Pal. Soc. p. 270, t. 64. f. 1. 



Catenipora escharoides, Lamk. Hist. Nat. vol. ii. p. 207. 



Our specimens are, without doubt, the true well-known " chain- 

 coral" whose distribution through the Lower Palaeozoic rocks is 

 universal both in time and space (Llandeilo to the Ludlow rocks). 

 The specimens resemble those of the Upper Silurian of Britain, and 

 probably belong to the Wenlock group, and are associated with forms 

 whose facies are of that series. The specimens collected by Mr. Hart 

 from Dobbin Bay and Cape Hilgard appear to be true H. catenu- 

 latus. 



There seems, however, to be considerable difference in some of 

 the forms of Halysites brought home by the naturalists of the 'Alert' 

 and * Discovery ; ' if not specifically different, they should be noticed 

 and recorded as varieties. The form Catenipora labyrinthica, 

 Goldf., Petr. Germ. vol. i. p. 75, t. 25. f. 5, would answer to those 

 having large interspaces or reticulations between the vertical coral- 

 lites. I know it is scarcely possible to separate the extreme varie- 

 ties O. escharoides, De Blainville, and 0. labyrinthica, Goldfuss, as 

 recorded and figured by Goldfuss ; but as we appear to have them 

 in the collection, it is necessary to draw attention to their extreme 

 variation. No less than six species are recorded by the American 

 and Canadian palaeontologists. 



Loc. Cape Hilgard, lat. 79° 41' ; Cape Erazer, lat. 79° 45' ; and 

 Dobbin Bay, lat. 79° 40'. Upper Silurian. 



Halysites catenulattjs, var. Eetldeni, Eth. (PI. XXVIII. fig. 1.) 

 Corallum massive ; base concentrically and irregularly rugose ; 

 the corallites radiate horizontally from the centre of the base (re- 

 sembling in habit those of Favosites), and then assume the vertical 

 growth when at or near the outer edge of the corallum ; tabulae 



