Vol.67.] OF SOUTH DEVON : EXETER DISTRICT. 399 



In 1902 Mr. Arber l suggested that it would be well 



'if possible, to drop tbe term Culm Measures altogether in speak'ng of 

 the Devon Carboniferous rocks, and to apply the nomenclature adopted with 

 regard to other British areas of similar age.' 



I venture to hope that the present paper brings such a change one 

 step nearer. 



A series of the specimens referred to in this paper will be placed 

 in the British and in the Exeter Museums. 



My warmest thanks are due to Mr. Arber and to Mr. Crick, both 

 of whom have spent much time and taken infinite trouble over my 

 often fragmentary material. I am also indebted for kind assistance 

 to Mr. J. Allen Howe, Dr. Hind, Mr. E. B. Rowley, Curator of the 

 Exeter Museum ; and to Mr. T. H. Withers, who kindly named the 

 trilobites. 



To Mr. W. P. Studholme I am indebted for kind permission to 

 work at Eordlands, and to Messrs. Saunders for allowing me to 

 collect at the Pinhoe Brickfields. Last, but not least, I must 

 thank Mr. C. Davies Sherborn, who has been with me over the 

 ground described in this paper, and who not only suggested the 

 work but has helped me at every turn. 



VI. Notes on Carboniferous Cephalopoda from the Neighbour- 

 hood of Exeter. 2 By George C. Crick, Assoc.B.S.M., E.Gr.S. 



The following notes refer chiefly to specimens which have been 

 collected by Mr. E. G. Collins. A few of the fossils examined are 

 in the Exeter Museum, while some, which formed part of the 

 Ticary Bequest, are in the British Museum. The specimens gene- 

 rally are not well preserved, and the Ammonoids but rarely exhibit 

 the suture-lines. 3 



Dimorphoceras (?discrepans Brown, sp.). 



1849. Goniatites discrepans T. Brown, ' Illustrations of the Fossil Conchology 

 of Great Britain & Ireland ' p. 28 & pi. xxi, figs. 8 & 15. 4 



The genus Dimorphoceras appears to be represented by a much 

 compressed, poorly-preserved, imperfect specimen, about 10 mm. 

 in diameter, exposed on the surface of a piece of a nodule from 

 Pinhoe. About half of the outer whorl seems to have belonged 

 to the body-chamber : the rest of the outer whorl is septate, and 

 near the umbilicus exhibits portions of several septa, but these are 

 too incomplete for the definite determination of the species. The 

 fossil is possibly referable to Dimorphoceras discrepans (Brown). 



Two specimens in the Exeter Museum, labelled 'Exeter' and 



i 'The Fossil Flora of the Culm Measures of North-West Devon, &c.' 

 Phil. Trans. Roy. Soc. ser. B, vol. cxcvii (1905) p. 320. 



2 Communicated by permission of the Trustees of the British Museum. 



3 In the following notes a record of the complete distribution of each species 

 is not attempted. 



4 For references and synonymy, see A H. Foord & Gr. C. Crick, Catal. Foss. 

 Ceph. Brit. Mus. pt. 3 (i897)"p. 222. 



