168 THE CAMBRIAN. [bull. 81. 



Ptychoparia (?) (Solenopleura) (?) breviceps, p. 49. 



(?) pernasutus, p. 49. 



(Euloma?) dissimilis p. 51. 



occidental is, p 51. 



similis, p. 52. 



similis, var. robustus, p. 53. 



(Euloraa?) affinis, p. 54. 



lseviceps, p. 54. 



(Pterocephalus) oceideos, p. 58. 

 Anomoeare ? parvum, p. 59. 

 Agraulos? globoane, p. 61. 

 Arethusina americana, p. 62. 

 Ogygia? spinosa, p. 63. 



(?) problematica, p. 63. 



The following genera and species are mentioned and illustrated: 



Protospongia fenestrata, p. 11. 

 Lingulepis maera, p. 12. 



? minuta, p. 13. 

 Lingula? raanticnla, p. 13. 

 Obolella discoidea, H. & W., p. 14. 

 Acrotreta gemma, Billings, p. 17. 



Under this species are also included Acrotreta subconica and A. attenuata, 

 Meek, 1873, and Acrotreta pyxidicula, White, 1874. 

 Kutorgina scnlptilis, Meek, p. 20. 



The synonymy of this species includes Iphidea(ft) sculptilis, 1873, and 

 Kutorgina minutissirna, H. & W., 1877. 

 Leptaena melita, H. & W., p. 22. 

 Kyolithes primordialis, Hall, p. 23. 

 Agnostus bidens, Meek, p. 26. 

 communis, H. & W., p. 27. 

 neon, H. & W., p. 27. 

 prolongus, H. & W., p. 28. 

 Olenellus gilberti, Meek, p. 29. 



howelli, Meek, p. 30. 

 Dikelocephalus bilobatus, H. & W., p. 40. 

 osceola, Hall, p. 40. 

 ? quadriceps, H. & W., p. 45. 

 Ptychoparia oweni, M. & H., p. 55. 



Under this species are placed as synonyms Conocoryphe (Ptychoparia) 

 gallatinensis, Meek, 1873, Crepicephalus (Loganellm) centralis, Whit- 

 field, 1877. 

 anytus, H. & W., p. 56. 

 granulosus, P. haguei and P. nitidus, H. & W., p. 57. 



Under the latter species Crepicephalus (Loganellus) simulator, H . & 



W., 1877, is placed as a synonym, 

 unisulcatus, H. & W., p. 38. 

 (Pterocephalus) laticeps, H. & W., p. 59. 

 Ptychaspis minuta, Whitfield (?) p. 60. 

 Chariocephalus (?) tumifrons, H. & W., p. 61. 



Notes on the genus Acrotreta of Kutorga are given on page 16 ; and 

 observations on Olenellus howelli on pages 32-39. 



