158 G. C. Crick — Fossil Cei^halopoda 



Middle Devonian of the Eifel, but occurring also in the Devonian 

 of Mudstone Bay, South Devon,^ and to this species the present 

 specimen appears to be allied. Other examples of this genus 

 v*rere figured by Phillips in his work on the Palasozoic fossils 

 of Cornwall, Devon, and West Somerset, and by Whidborne 

 in his Monograph on the Devonian Fauna of the South of 

 England, but the fossil under consideration cannot be definitely 

 referred to any of these, nor indeed to any of the forms described 

 by Holzapfel in his work entitled " Das obere Mitteldevon 

 (Schichten mit Stringoceplmlus Bnrtini und Maeneceras terebratum) 

 im Rheinischen Gebirge." ^ The specimen appears to have been 

 originally somewhat laterally compressed, but it has doubtless 

 suffered considerable additional compi'ession during fossilization. 

 We have not ventured to name this fossil, the afiinities of which, 

 however, indicate that it is of Middle Devonian age. 



Phragmoceras (?) sp. (PL V, Fig. 7.) 



The specimen doubtfully referred to this genus is the small 

 natural internal cast figured in PI. V, Fig. 7. It is the posterior 

 portion of the septate part of a rapidly expanding shell. It is 

 15 mm. long, its anterior and posterior diameters being 12 and 

 6*5 mm. respectively, five ^ chambers being obscurely visible. It is 

 slightly curved, and seems therefore to have been the posterior 

 portion of a Phragmoceras rather than of a Gomphoceras or Poterioceras, 

 but it is too imperfect for accurate determination. 



Agoniatites sp. (Text-figures 2, 2a.) 



The genus Agoniatites is represented by a laterally compressed 

 and very much distorted example (see accompanying figures). The 

 specimen consists of the natural internal cast of the greater part of 

 the body-chamber, and of the two preceding chambers, but is so 

 much crushed that its original dimensions cannot be ascertained. It 

 was evidently a rather rapidly expanding shell. The greatest 

 height at the anterior part of the body-chamber is 42 mm. At the 

 base of the body-chamber (see Fig. 2a) the height of the whorl from 

 the margin of the umbilicus to the small median lobe of the suture- 

 line is 27 mm., the greatest width of this part of the shell being 

 16-5 mm. The periphery appears not to have been acute, but 

 a little flattened, there being indications of such a flattening near 

 the base of the body-chamber, the flattened portion being apparently 

 about 2-5 mm. wide. The curve on the inner edge of the body- 

 chamber (see Fig. 2) shows that the fossil was not very widely 

 umbilicated. Although crushed and considerably distorted, the 

 form of the septal surface shows clearly that the specimen is 



1 Described and figured as Cyrtoceras (?) hdellaites by J. Phillips, Pal. Foss. 

 Cornwall, Devon, and West Somerset, 1841, p. 117, pi. xlvii, figs. 223a, b, and 

 referred to D'Ai'chiac & De Verneuil's species by A. H. Foord, Cat. Foss. Ceph. 

 Brit. Mas., pt. ii (1891), p. 58. 



- Abbaudl. d. k. Preuss. geolog. Landesanst., Neue Folge, Heft 16 (1895). 



2 Six chambers are indicated in the figure. 



