GONIATITES. 63 



F. A. Romer's earliest figure^ of G. hicaiialicnlatus differs (if it is accurately 

 drawn) from Sandberger's species in being more definitely oval in the front view 

 and in having no central lobe (but a deep saddle instead) in the suture-line. His 

 later figure^ more nearly approaches it, having, however, a decidedly smaller 

 umbilicus. I am inclined to regard this, however, as a variety more nearly allied to 

 G. obliquus, though apparently separated from it by its more convex back and less 

 oblique suture-lines. It may be compared with the Brit. Mus. specimen (Plate V, 

 fig. 7). 



4. GoNiATiTBS INCONSTANS, PMlUps. PI. V, figs. 5, 5 a, 6, 6 a, 6 h. 



1841. GoNiATiTES INCONSTANS, Fhil. Pal. Foss., p. 123, pi. li, fig. 238. 



1842. — cosTULATUs, d'Archiac and de Verneuil. Greol. Trans., ser. 2, 



vol. vi, pt. 2, p. 341, pi. xxvi, figs. 3 a, h. 

 1885. — WiLDUNGENSis, Waldsmidt. Uber Devon. Sch. Gegend Wil- 



dungen, p. 921, pi. xl, fig. 1. 

 1888. — INCONSTANS, Mh. Toss. Brit., pt. 1, Pal., p. 167. 



Description. — Shell small, discoidal, of about four whorls, hardly involute. 

 Umbilicus very large, shallow, displaying the greatest part of the interior whorls. 

 Nucleus large, globose. Sides of the whorls rising steeply from the whorl below, and 

 after rounding rapidly over the dorsal part sloping obliquely to the ventral region, 

 where they bend over to form the broad and slightly convex back or keel. Surface 

 ornamented with numerous coarse threads or small ridges, which arch forward 

 toward the ventral part, where they become much finer. An obscure spiral con- 

 striction on the sides near the ventral region. 



Size. — Height about 20 mm., depth about 10 mm. 



Localities. — One imperfect but well-preserved specimen is in Mr. Vicary's 

 cabinet from Wolborough, and two others in a more obscure state of preservation 

 are in the Godwin-Austen collection in the Museum of Practical Geology. 



The original specimens described by Phillips were from the neighbourhood of 

 Exeter. 



BeniarJcs. — The specimens from Wolborough are not so large as some of those 

 figured by Phillips, and vary from them in several particidars. Their whorls are 

 rather more numerous, their ornamentation is less prominent, and the depressions 

 by the sides of the keel are less deep. There can, however, be little doubt that 

 they belong to the same species, which that author describes as being exceedingly 



1 1850, F. A. E5m., ' Beitr.,' pt. 1, p. 19, p). iii, figs. 29 a, h. 



2 1860, F. A. Eom., ' Beitr.,' pt. 4, p. 157, pi. xxiv, fig. 1. 



