NO. 2.] DESCRIPTION OF THE FOSSILS. 71 



Only a little of the sculpturing has been preserved. Up to a size of about 

 50 mm. in diameter the whorls are ornamented with strong ribs extending 

 over the flanks in broad curves, open towards the front. The outside is 

 crossed by the ribs in broad curves, convex towards the front. The ribs that 

 have been preserved fork at about half the height of the whorls. Upon the 

 umbilical surface the ribs are scarcely indicated; upon the lower half of the 

 whorl they are rather distinct, and comparatively narrow. After bifurcating, 

 the ribs become lower, broader, and have a more rounded cross-section. 

 The ribs, as before mentioned, are only found to a size of 50 mm. in dia- 

 meter. Subsequently their place is taken by perfectly flat, scarcely perceptible 

 lines. The whorls become quite smooth, or nearly so, as we see on the 

 anterior of the specimen before us, which is partly covered with the shell. 

 Only a very small fragment of the body-chamber was preserved. 



The lobe-line was only to some extent distinctly 

 visible. Lobes and saddles are much and deeply cleft. 

 The siphonal lobe is deep; its slender branches run 

 parallel. The tripartite first lateral lobe is only slightly 

 Fig. 12. Macrocephalites deeper than the siphonal lobe, and the second lateral 



Kcettlitei n. sp. i o b e a jj u i e shorter. The deeply cleft external saddle 



Lobe-line as far as to the 



2nd lateral lobe ; the first is divided by a very deep secondary lobe into two 

 lateral saddle is somewhat , t Qne fa d t d 



weathered. Nat. size. 



narrower inner part. The first lateral saddle is lower 



than the external saddle, and the succeeding, badly preserved saddles are low, 

 broad, and bipartite. The auxiliary lobes (3) are narrow and short. 



To judge from the substance filling the body chamber and the umbilicus, 

 the piece evidently originated in the hard, gray-brown, phosphoritic clay, 

 found on July 14th, 400 feet above the sea-level; Windy Gully north-east of 

 Elmwood. 



Remarks. The very narrow umbilicus, the form and curvature of the 

 ribs and the lobe-line mark Macrocephalites Kcetttitzi n. sp. as being allied 

 to Macrocephalites Ishmae Keys, sp. 1 



1 A. Graf Keyserling (and P. von Krusenstern), 'Wissenschaftliche Beobaehtungen auf 

 einer Reise in das Petschora Land im Jahre 1843', St. Petersburg, 1846, p. 331, pi. 

 XX. figs. 8-10, pi. XXII. fig. 15. 



