SALTER, ARCTIC GEOLOGY. 533 



land. The rest are new to me either as occurring in Europe or 

 America. 



The general resemblance with the fossils of our own Upper- 

 Silurian rocks is very considerable, and, in the absence of many 

 characteristic Lower- Silurian genera, the identity of several 

 species with Upper-Silurian forms, and the great prevalence of 

 Corals, I think we are quite warranted in placing these strata in 

 the upper division of the Silurian system.* 



The shores at the entrance of Wellington Strait, at Cape Riley, 

 Beechey Island, and Cornwallis and Griffiths' Islands, contain the 

 following fossils, most of which are figured in the work above 

 quoted : — 



Crustacea. 



1. Encrinurus laevis, Angelm'i (Sutherland's ** Journal," 



Appendix, pi. 5, f. 14). 



2. Proetus, sp. (/. c, pi. 5, f. 15). 



3. Leperditia (baltica, Hisinger^ sp., var.) arctica, Jones, I. c, 



pi. 5, f. 13. 



MOLLUSCA. 



4. Lituites, n. sp. Allied to L, articulatus, Sow., but with 



more numerous whorls. 



5. Orthoceras Ommanneyi, n. sp. (/. <?., pi. 5, f. 16, 17). 



6. species, with distant septa and central siphuncle. 



7. species, imperfect, but distinct from both the preceding. 



8. Murchisonia, sp. (/. c«, pi. 5, f. 18). Like M. gracilis, Hall. 



9. larger species, with numerous whorls {I.e., pi. 5, f. 19). 



10. Euomphalus, a small species. 



11. Modolia (or Modiolopsis). An oval and flattish form. 



12. Strophomena Donneti, n. sp. (/. c, pi. 5, f. 11, 12). 



13. , sp. The same as at Leopold's Island. 



14. Ortliis, large flat species. Griffiths' Island. 



15. Spirifer crispus, Linn ? (/. c, pi. 5, f. 8). 



16. , sp., very like S. elevatus, Dalm. 



17. Chonetes lata, Voii Buck ? 



18. Pentamerus conchidium, Dalm. (/. c, pi. 5, f. 9, 10). Coarse- 



ribbed and fine-ribbed varieties. 



19. Rhyuchonella phoca, n. sp. (/. c, pi. 5, f. 1-3). 



20. _~, sp. (/. c, pi. 5, f. 5). 



Radiata. 



Encrinites are so abundant at Cape Riley that in several places 

 the rock is composed entirely of their detritus. A species of 

 Actinocrinus is the only fragment at all recognisable. 



Corals are very abundant ; twenty or more species having been 

 observed. Among them there are : — 



21. Ptychophyllum. 



22. Cystiphyllum. 



* These researches by Mr. Salter are referred to and verified in Murchi- 

 son's " Siluria." last edit., 1867, pp. 440-441. — Editor. 



