160 G. C Crick — Fossil Cephalopoda from N. Cornirall. 



present specimen cannot be specifically determined its affinities 

 seem to indicate that it came from rocks of Lower Middle 

 Devonian age. 



Notwithstanding the fragmentary character of the specimens- 

 described above, their affinities seem to show that they are all 

 certainly of Devonian and most probably of Eifelian or Lower 

 Middle Devonian age. 



In addition to the specimens described above, Mr. Howard Fox 

 has submitted to me for examination some very imperfect fossils 

 from other localities in North Cornwall. 



Of the two specimens which are marked " E. of Dinham Creek,"^ 

 one seems to be referable to the fairly common species in the Wissen- 

 bach Slates that was described as Orthoceras longicameratum by 

 Foord' (= Orthoceras commutntnm, C. G. Giebel -). The other, nearly 

 70 mm. long, is a rather rapidly tapering Orthoceras, intermediate 

 in this respect between Roemer's Orthoceras rapceforme ^ and his 

 0. suhconicum,* but having shallower chambers than either of these 

 species. Both Roemei-'s species occur in the Wissenbach Slates. 



Among some specimens labelled "Ti-ewornan" are probably 

 Orthoceras vassoviense, Foord (= 0. commutatum, C. G. Giebel), 

 0. gracile, Blumenbach,'' and a fragment of a Bactrites. These 

 species of Orthoceras are rather common in the Wissenbach Slates, 

 from which two or three species of Bactrites have also been 

 recorded. 



There are two rock fragments labelled " Gravel Caverns." Of 

 these one contains an obliquely-septated fragment of possibly 

 a Bactrites, or more probably an Orthoceras, a little more than 

 10 mm. long; the other a small water-worn Goniatite 2'5 mm. in 

 diameter, with very indistinct suture-lines, belonging to the genus 

 Tornoceras. 



EXPLANATION OF PLATE Y, Fias. 6-S. 



Fig. 6. — Orthoceras cf. hercynicum, E. Kayser. a, entire specimen reduced to 

 two-tliii'ds of the natural size ; h, anterior aspect of last septal surface, showing 

 the position of the siphuncle, dva-\vTi of the natural size. E. of Cant Cove. 



,, 7. — Phra ffmoceras ('f) f-ii. Nat. size. Cant Hill, St. Minrer, Cornwall. 



,, 8. — Cophinoceras sp. a, lateral aspect of entire specimen, reduced to two- 

 thirds of the natural size ; b, a portion of the markings on the body-chamber 

 enlarged. Cant Hill, St. Minver, Cornwall. 



(For Figs. 1-5 of this Plate, see Dr. H. "Woodward's " Notes on Trilobites fi'om 

 Cornwall," pp 151-154.) 



1 See a»tea, p. 155, footnote. 



2 C. G. Giebel : Fauna der Vorwelt, Bd. iii (1852), p. 233. 



3 F. A. Eoemer : Pahxsontographica, Bd. iii, Lief. 1 (1850), p. 16, pi. iii, fig. IS. 

 * F. A. Roemer : ibid., p. 17, pL iii, fig. 20. 



5 Blumenbach : Specimen Archa3ologia3 Tellmis, 1803, p. 21, pi. ii, fig. 6. 



