180 
THE LIAS AMMONITES. 
8. IPamily Clymenid^, Edwards, 1849. — Shell discoidal, more or less involute ; septa 
simple or slightly lobed ; siphuncle internal or coluraellar. 
Genus. — Clymenia, Jiwws^^f, 1832. Endosiphonites, ^^'^^^et/, 1840. Shell spiral, 
discoidal, with contiguous whorls, more or less involute ; septa form a distinct lobe on 
the sides, with angles more or less acute ; siphon small, internal, situated against the 
turns of the spire. Species numerous in the Devonian of Europe and N. America. 
Ex. Clymenia Sedyioicldi, Miinster (fig. 33) ; C. striata, Miinst. (fig. 33). 
Fig. Z2.— Clymenia Sedgwickii, Miinst. Fig. 33. — Clymenia striata, Miinst. 
Suh-order 5.— AMMONOIDA, WriyJd, 1880. 
Shell spiral, bent, or straight, with a capacious dwelling-chamber. Margins of the 
septa angular, digitate, or much ramified, forming large lobes. Siphuncle marginal, 
external with regard to the shell, or anti-columellar. This section is divided into three 
Eamilies, the Goniatites, the Ceratites, and the Ammonites. 
1. Family Goniatitid^e, Wright, 1880, — Shell rolled into a close spiral; septa with 
angular margins. 
Genus.-— {yomKiYi^^, Be Ilaan, 1825. Aganides, Montfort, 1808. Shell spiral, regu- 
larly rolled on the same plane, with convolute contiguous whorls. Septa transverse, 
Fig. 34. — Goniatites Hoeninghaiisi, Fig. 35. — Gonin/ifes Orbignyanus, Fig. 36. — Goniatites rotalorius, 
Bronn. d'Archiac. de Ko-'i'mk 
