386 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



Two specimens, which Mr. Schuchert says " differ somewhat from Iowa 

 specimens of G. Iveviuscula " in having faint indications of plications along 

 the middle of the anterior margin, were collected by him at Thedford, in 

 the "Middle third of the section" in 1895. They are labelled. United 

 States National Museum Catalogue of Invertebrate Fossils, No. 26,509. 

 A few typical examples of this species have since been collected at the 

 same locality by Mr. Kernahan. 



Camarotcechia Sappho, Hall. 



Bhynchonella Sappho, Hall. 1860. Thirtepnth Rep. N. York St. Cab. Nat. Hist., p. 87. 

 Rhynchondla (Stenocimm) Sappho, Hall. 1807. Pal. N. York, vol. IV., p. 340, pi. 54, figs. 



33-43. 

 Bhynchonella Sappho, Herrick. 1888. Bull. Denison Univ., vol. III., p. 40, pi. 5, fig. 1; 



and pi. 7, fig. 25. 

 CamarotOichia Sappho, Hall and Clarke. 1893. Pal. N. York, vol. VIII., pt. 2, p.l92, pi. 



57, figs. 10-14. 



Thedford, in the " Middle third of the section," C. Schuchert, 1895 : one 

 crushed and distorted specimen, which is identified with this species by 

 Mr. Schuchert. It is No. 26,564 of the Catalogue of Invertebrate Fos- 

 sils in the United States National Mu.seum. 



Camarotcechia Horsfordi, Hall. 



Rhynchondla Horsfordi, Hall. 1860. Thirteenth Rep. N. York St. Cab. Nat. Hist., p. 



87. 

 Bhynchonella (Stenocisma) Horsfordi, B.a.W. 1867. Pal N. York, vol. IV., p. 339, pi. 54, 



figs. 24-32. 

 Camarotcechia Horsfordi, Hall and Clarke. 1894. Pal. N. York, vol. VIII., pt. 2, p. 192, 



pi. 57, figs. 7-9. 



A few specimens of this shell have been collected at Thedford and 

 Ravenswood by the Rev. Hector Currie, and at Thedford by Mr. Kerna- 

 han, but the species seems to have been first recognized in Canada by 

 Mr. Schuchert. 



Camarotcechia Thedfordensis. (Nom. prov.) 



Plate 48, figs. 11, 11 a and 11 6. 



Perhaps a diminutive stratigraphical variety of Camarotcechia 

 BiUingst, Hall. 



Cfr. Bhynchonella Thalia, Billings. 1800. Canad. .Journ., vol V., p. 272, figs. 23-25. 



But not B. Thalia, d'Orbigny, 1847. 

 !■ .r „ 1863. Geol. Canada, p. 370, fig. 386. 



Bhynchonella (Stenocisma) Billingsi, Hall. 1807. Pal. N. York, vol. IV., p. 336, 



pi. 54, figs. 9-13. 

 Oamarotachia Billinr/si, Hall and Clarke. 1893. Ibid., vol. VIII., pt. 2, p. 192, 

 pi. 57, fig. 3. 



