94 DEVONIAN FAUNA. 



3. Gyrocekas ornatum, Goldf. MS., sp. PI. VIII a, figs. 1, 1 a. 



. Cyetocebatites oenattis, Goldfuss MS. Bonn Museum. 

 1842. — — D'Arch.&ndideVern.i-aot Phillips). Geol. Trans., 



ser. 2, vol. vi, p. 349, pi. xxviii, figs. 5, 5 a, h. 

 1853. LiTTTiTES OENATTTS, Steininger. Geogn. Besch. Eifel, p. 42. 

 1865 ? Gyeoceras NUDtrM, Barrande. Syst. Sil. Boheme, vol. ii, p. 165, pi. xliii, 



figs. 8—12, Et. G. 

 1889. Ctetoceeas majesticum, Whidborne. Geol. Mag., dee. 3, vol. vi, p. 29. 



Description. — Shell large, much recurved, consisting of about one and a half 

 volutions. Yolutions slightly spiral, free. Apex apparently blunt. Apical por- 

 tion touching but not indenting the outer whorl, the portion near the body- 

 chamber becoming straighter, separated, and distant from the interior whorl. 

 Section of whorls a regular depressed oval, narrowed laterally, the transverse 

 diameter being to the ventro-dorsal diameter in the ratio of 23 : 15. Shell 

 increasing very slowly. Siphuncle moderately large, circular, not inflated, situated 

 close to the centre of the ventral margin. Septa very narrow, about twenty-eight 

 to a volution, very concave. Sutural line slightly advancing from the dorsal 

 region to the elbow, over which it passes in a shallow saddle, and then, after a 

 very shallow lobe on each side of the back, forms another slight sinus over 

 the siphuncle. Ventral surface showing indistinct signs on the cast of parallel 

 lineations (about seventeen or eighteen). Shell apparently very thin. 



Size. — Length, 145 mm. ; width, 113 mm. ; depth, 71 mm. Width of section 

 at or near the apex, 14 mm. ; height, 10 mm. 



Locality. — A single specimen in the Godwin-Austen Collection in the Museum 

 of Practical Geology is said to be from Newton, but it evidently is not an English 

 specimen. 



Remarks. — This fine specimen bears the name of Newton Bushel upon its label 

 in the Museum, but the matrix is most unusual for that place, being of a coarse 

 and rather crumbly nature, tinged with yellow, tending towards an oolitic structure, 

 and showing occasionally ferruginous deposits on its surface. The surface has 

 almost entirely disappeared, but there are upon it one or two small patches of 

 Alveolites or some kindred Zoophytes. The body-chamber is entirely absent, 

 but apparently it must have been hardly recurved in that portion. The apical 

 surface is gone, but evidently closed immediately over the last chamber present. 

 The ornamentation appears to have been in the form of low longitudinal threads, 

 but the indications of it are too indistinct to be displayed by the draughtsman on 

 the figure. 



The spiral is not quite symmetrical, the central plane dividing the shell 

 unequally, and though the shell has been broken in the extraction, and then 



