156 



G. C. Crick — Fos-iil Cephalopoda 



Hasselfelde in the Hartz, a locality which also yields the previously- 

 mentioned species, Orthoceras hercynicum. 



Fig. 1. — Orthoceras cf. commutatum, C. G. Giebel, sliowing mternal casts of three 

 chambers, and of part of a fourth. \a, anterior end of the same specimen. 

 Cant Hill, St. Miuver, Cornwall. Drawn of two-thirds of the natural size. 

 (The reduction of the ligure causes the chambers to appear shallower than they 

 really are.) 



COPHINOCERAS Sp. (PI. V, FigS. 8rt, 86.) 



The fossil which is here referred to this genus consists of a natural 

 internal cast of a (probably the greater) part of the body-chamber 

 and of the six preceding chambers of a slightly curved shell. It 

 ineasures on the outer or convex curve about 140 mm., of which the 

 body-chamber occupies about 82 mm. Only one side and a small 

 portion of the other are exposed. The specimen is much flattened, 

 its greatest thickness being only about 28 mm. The greatest width of 

 the fossil is at about the middle of the portion of its septate part, and 

 is about 78 mm., but the boundary of tlie concave surface of the 

 specimen is not exposed. Of the chambers that are preserved the 

 oldest is the deepest, being at the middle of the lateral area 12-5 mm. 

 deep ; in a similar position the two next are each about 10 mm., 

 the next about 8 mm., the two last being each about 6 mm. deep. 

 Near the anterior end of the specimen there is a very broad, ill- 

 defined, shallow constriction, so that the anterior boundary of the 

 fossil, at least the right-hand side of it, probably represents the 



