414 NOTES ON A COLLECTION OF SILURIAN FOSSILS — AMI. 



10. Rhynchonella FORMOSA, Hall. — Possibly this species, or 

 else a very closely related one. The specimen in question, though 

 imperfectly preserved, presents such characters as make it agree 

 well with the descriptions and figures given by Prof James Hall 

 in his " Palaeontology of New York State," vol. III., p. 236, figs. 

 6, a-y, on plate XXXV. 



LAMELLIBRANCHIATA. 



11. Orthonota equilatera, Hall. sp. Tellinomya ? equi- 

 latera, Hall, and Tellinites afftnis, McCoy, are very closely 

 related to each other. One form abounds in the Lower Helder- 

 berg rocks of America, whilst the other is not unfrequent in the 

 Ludlow rocks of Britain. The characters of both species agree 

 very well, and the Cape George specimens resemble the figure of 

 Tellonoviya ? equilatera, Hall, so much that they. have been pro- 

 visionally^ referred to this. The Canadian specimens are some- 

 what smaller than the New York specimens. 



12. MoDiOLOPSis ex ILLS ? Billings. A form which agrees 

 tolerably well with Mr. Billings's species from the Arisaig 

 Silurian rocks. 



13. Nuculites (Clidophorus) erectus, Hall. 



14. Nuculites, sp. indt. This form is most probably a 

 Nuculites ; but is too imperfectly preserved for specific identifi- 

 cation. 



GASTEROPODA. 



15. Bucania sp. A species of Bucania referable to £itca Tim 

 profunda, Hall, seems to be present in the collection. 



16. HoLOPEA reversa. Hall. 



CEPHALOOPODA. 



17. Orthoceras sp., cf. O. annulatum. Sow. This is a well- 

 known Wenlock limestone species in Britain, and a Silurian 

 form in America 



18. Orthoceras sp. indt. An imperfectly preserved speci- 

 men which cannot be referred with certainty to any species 

 already described. Nor is it sufficiently well preserved to wai-- 

 rant describing as new. The septa however appear to be closely 



