118 DEVONIAN FAUNA. 



seems about the same length as the septal part, but the specimen is probably 

 somewhat defective both at the oral and apical ends. The outside shell remains 

 and appears rather thin, but no ornamentation can be distinguished upon it. 



There is no definite sign in either specimen of any closing in round the 

 aperture. On the other hand it would appear at first sight (vide Figs. 2, 2 a, 3) as 

 though the aperture was low, wide, and simple. This appearance, however, is 

 deceptive. The horizontal lines in the figures do not really represent the margin 

 of the shell but only a line of ornament or of weakness where the specimens have 

 been broken off ; the shell was continued above it, and there are indications that 

 then it became almost horizontal. A very similar appearance would be given by G. 

 consohrinum, Barrande,^ if the upper part of it were removed. 



Affinities. — Cyrtoceras superstes, Barrande,^ is very similar to it, but the body- 

 whorl is wider below, and the shoulder is less defined. In section, and in the 

 depth of the segment it agrees ; and, as far as can be seen, in general shape. 



Orthoceratites suhfusiformis, Miinst.,^ and 0. suhpyriformis, Miinst.,* seem more 

 elongate forms, and have their outlines arched instead of nearly straight. 0. sub- 

 fusiformis, d'Arch. and de Vern., on the other hand, approaches it more nearly, and 

 if the drawing, which shows some sign of idealism, be inaccurate, may be of the 

 same species. Its section, however, is circular, and there is no sign or mention of 

 any constriction in the body-chamber. It is moreover stated to be covered with 

 fine strise like those seen in Phragmoceras ? ungidatum, Plate XI, fig. 6. It is, how- 

 ever, quite possible that the smoothness of our specimens is due to surface oblitera- 

 tion during fossilization. 



2. GoMPHocERAS, sp., PL XI, figs. 4, 4 a. 



Description. — Shell rather large, straight, rapidly tapering. Profiles of the 

 sides almost straight, very slightly convex on the body -chamber (as far as known) 

 and very slightly concave on the septal part ; the dorsal profile much more oblique 

 than the ventral. Chambers rather deep, the distance between the septa being 

 4 mm. Section elliptic. Siphuncle small, close to the margin on the longer axis. 

 Septa concave. Apex small. 



Size. — About 60 mm. long. 



Locatity. — A single specimen from Wolborough is in Mr. Vicary's Collection. 



Remarks. — The fossil upon which the above description is founded is very 



' 1865, Barr., ' Syst. Sil. Bohem.,' vol. ii, p. 281, pi. Ixix, figs. 6—10, Et. E. 



•■* 1866, Ibid., p. 568, pi. cliv, figs. 11—13, Et. G. 



3 1840, Miinst., ' Beitr.,' pt. 3, p. 103, pi. xx, figs. 6—9. 



1 Ibid., p. 103, pi. XX, fig. 10. 



