28 DEVONIAN FAUNA. 



• 



Locality. — A specimen from Kingdon's, Shirwell, is in the Barnstaple Athengeum. 



BemarJcs. — This is evidently a species of either Poterioceras or possibly 

 GompJwceras. Its more central siphuncle (which is situated at a point 10 : 16 on 

 the transverse diameter) distinguishes it from the various species found in South 

 Devon ; but the only specimen of it is unfortunately far too imperfect for 

 identification. 



2. PoTERiocEEAs ? sp. Plate IV, fig. 5. 



1841. Okthoceeas imbeicatttm, Phillips (not Hisinger). Pal. Foss., p. Ill, 



pi. xlii, fig. 207. 

 not 1890. — Champeenowni, Whidb. Mon. Devon. Faun., vol. i, p. 142, 



pi. XV, figs. 11, 12. 



8ize of fragmentary specimen : width 36 mm. by 21 mm. 



Locality. — Phillips's figured specimen from Marwood is in the Museum of 

 Practical Geology. 



Bemarks. — This specimen is as poor as well could be, — consisting of eight 

 crushed chambers from which the external parts are gone. It affords us little 

 knowledge of the shell, except that it shows that there is a distinct wide shallow 

 sinus or bay in the front margins of the septa, which I had not observed in the 

 South Devon specimens, and hence that one point of difference in Phillips' shell 

 from Actinoceras Soiverbyi, M'Ooy, is removed, though on the other hand the 

 almost exactly central position of the siphuncle is confirmed. 



From the apparent rapidity of tapering in the above specimen, it seems to me 

 most probable that it will, after all, prove to be distinct from the South Devon 

 0. Gharripernowni, and to belong to Poterioceras or Gomphoceras. 



III. Family. — ORTHOCEEATiDiE, Broderip, 1839. 

 1. Genus. — Oethooeeas, Breyn, 1732. 



1. Orthoceras, sp. 



cf. 1839. Oethoceras Ltjdense, Sowerhy. In Murchison's Silurian Researches, 



p. 619, pi. ix, fig. 1. 

 1841. — — Phillips. Pal. Foss., p. 110, pi. xlii, figs. 206 a—c. 



1855. — STEiATFM, M'Coy. Brit. Pal. Foss., p. 405. 



? 1888. AcTiNOCEBAS STBiATUM ? Foord. Catal. Foss. Cephal., p. 187. 



