24 DEVONIAN FAUNA. 



Beyrichia devonica, Jones and Woodward,^ is very much larger and longer, and 

 has more confluent lobes. 



MOLLUSCA, Cuvier, 1812. 



Class— CEPHALOPODA, Cuvier, 1798. 



Order— TETEABRANCHIATA, Owen, 1832. 



Sub-order— AMMONOIDE A, UOrUgny, 1840. 



I. Family — Gonfatitid^, Gray, 1840. 



1. Genus — Goniatites, de Haan, 1825. 



Sub-genus — Agoniatites, Meek, 1877. 



1. Agoniatites, sp. Plate IV, fig. 2. 



Description. — Shell of moderate size, discoid, flattish. Umbilicus rather small, 

 shallow, open. Whorls rising steeply from the umbilicus, turning immediately 

 through nearly a right angle to form a sub-angular elbow, and then spreading out 

 flatly towards the back, and bearing on the elbow (or margin of umbilicus) a few 

 slight undefined radiating nodules. Suture arching backwards from the elbow or 

 umbilical margin in a simple lateral saddle for more than half the width of the 

 whorl. 



Size. — Diameter about 30 mm. 



Locality. — A single imperfect specimen from Kingdon's, Shirwell, is in the 

 Barnstaple Athenaeum. 



Bemarlis. — Though a portion only of this shell is visible in the matrix, 

 Mr. Crick points out to me that it evidently, from what is seen of its suture-line, 

 belongs to the group or genus Agoniatites, and is closely allied to Agoniatites 

 transitorius, Phillips, sp. There are also slight signs of transverse lineations as in 

 that species, but it differs from it by having nodules or swellings on the margins 

 of the whorls just round the umbilicus. 



Affinities. — G. Boemeri, Holzapfel,^ has a smaller umbilicus, more sloping 

 sides, and no nodulations. 



1 1889, Jones and Woodward, ' Geo!. Mag.,' dec. 3, vol. vi, p. 386, pi. ix, figs. 3—5. 



2 1882, Holzapfel, ' Palseontographica,' vol. xxviii, p. 234, pi. xlv, figs. 1 — 1 I. 



