80 DEVONIAN FAUNA. 



Remarhs. — I liave not seen Phillips's figured example of this shell, nor have I 

 met with any other Goniatites that could be referred to it ; I can therefore only re- 

 produce his description, observing that he appears to be in some doubt of the 

 proper locality of his fossil. 



Judging from the figure, it would appear to belong to Beyrich's group 

 -^quales. 



SuB-OEDER.— NAUTILOIDBA. 



I. Family. — Nautilidji. 



1. Genus. — Temnocheilus, M'Coy, 1844. 



This sub-genus of Nautilus is defined by M'Coy as discoid, involute, umbilicate ; 

 a deep sinus in the middle of the upper lip ; septa simple ; siphuncle central. It 

 is further defined by Meek and Worthen as having a trapezoidal section, a very 

 broad back, and a tuberculated elbow. The suture-line is said to have a broad 

 outer lobe, and the siphuncle to be central or external. It extends from the 

 Devonian to the Trias. 



It difiers from Hercoceras by its uncontracted aperture, from Gyroceras by its 

 united whorls, from Nautilus proper by the sinus on the lip, and by its trapezoidal 

 and generally tuberculated whorls. 



Mr. Foord informs me that he refers Nautilus suhtuherculatus, Sandberger, to 

 this genus ; and the species described below evidently belongs to the same genus 

 as that shell, although in it the tubercles are absent. 



1. Temnocheilus inoenatus, Whidborne. PI. VII, figs. 3, 3 a. 



1889. Hebcoceeas inoenattjm, Whidb. Geol. Mag., dec. 3, vol. vi, p. 29. 



Description. — Shell large, nearly, if not quite, equilateral, hardly involute. 

 Umbilicus very wide, with the inner whorls wholly exposed. Sides of the whorl 

 rising from the back of the inner whorls slightly outside their highest lateral 

 point, thence continuing in a gentle curve upwards and slightly outwards, till the 

 greatest height is nearly reached, when they arch round with an almost semi- 

 circular curvature to the back, which is very broad and very slightly convex. 

 Section of the whorls transversely oval, except that the inner margins are slightly 



