GtRabau — Faunas of the Hamilton Group. 



249 



28. Pleurotomaria. Lucixa, var. perfasciata, Hall. 



1879, Hall, Pal. N. Y.. vol. 5. pt. 2, p. 83, pi. 21. 



A single fragment showing the form and surface markings of this variety 

 was found in the middle Pleurodictyum layer at Avery's creek. 



29. Pleurotomaria Itys, Hall. 



1879, Hall, Pal. N. Y., vol. 5, pt. 2, p. 70, pi. 20. 



This species occurs in the Pleurodictyum beds, but is rare, being chiefly rep- 

 resented by casts. In the Nautilus bed occurs a variety which approaches P. 

 itys, var. tmuispira, in having six volutions, strong revolving stria3, and coarse 

 crenulations. The medial band however is bounded by strong revolving 

 carina?, as in the typical forms of the species. 



30. Pleurotomaria capillaria, Conrad. 



1879, Hall, Pal. N. Y., vol. 5, pt. 2, p. 77, pi. 20. 



A number of crushed specimens from the Strophalosia bed along the 

 lake shore, present the features of this species, especially in the revolving 

 carina?. 



Genus Loxonema ; Philips. 



31. Loxonema Hamiltonle, Hall. 



1879, Hall, Pal. N. Y., vol. 5, pt. 2, p. 45, pi. 13. 



This species occurs only in the Strophalosia bed. It is a common 

 form and usually shows the surface stria?. It is often loosely coiled. 



32. LoXONEMA DELPIIICOLA, Hall. 



1879, Hall, Pal. N. Y., vol. 5, pt. 2, p. 47, pi. 13. 



This species, like the preceding, is restricted to the Strophalosia bed. 

 The specimens are all crushed, but show the suture band, and there is little 

 doubt of their identity. 



Genus Bellerophon, Montfort. 



33. Belleropiiox Leda, Hall. 



187J), Hall, Pal. N. Y., vol. 5, pt, 2, p. 110, pi. 23. 



I have found this species only below the Trilobite beds. It occurs 

 sparingly in the shale below them and in the Pleurodictyum beds. In the 

 Strophalosia bed it is a common form, being Avell preserved and of good 



