AMMONITID®. 65 
CLYMENIA, Munster, 1854. 
Etym.— Clymene, a sea-nymph. 
Syn.—Endosiphonites, Ansted, 1840; Planulites, Munst., 1832. 
Distr —37 sp. Devonian; Germany, England. C. undulata, 
Miinst. (xxxi, 11). Fichtelgebirge. 
GonratTites, DeHaan, 1825. 
Etym.—G@onia, angles. Syn.—Aganides, Montfort, 1810. 
Distr.—About 320 sp. U. Silurian to Carboniferous ; Kurope, 
America, Australia. G. Henslowi, Sowb. (xxxii, 19). Carb. 
limestone; Isle of Man. 
Shell spiral, discoidal; sutures of septa lobed; siphuncle 
dorsal, its tubes directed backwards; septa concave; margin of 
the aperture sinuous. Aptychus a single corneous plate. The 
genus reached its maximum development in the Devonian period. 
The shell of Goniatites being very variable in form and the 
species numerous, Beyrich, Sandberger and others have divided 
them into sections, which will probably, as in the case of Ammo- 
nites, form distinct genera hereafter. Sandberger uses the 
characters of the sutural line for his groups, as follows : 
1. Linguati. Lobes and saddles linguiform, rounded. 
2. Lanceolati. Lobes narrow, lanceolate; saddles rounded, 
claviform. 
3. Genufracti. Second lateral saddle greatly developed, 
forming nearly a right-angle with the second lateral lobe; 
ventral lobe small. 
4. Serrati. Lobes and saddles narrow, sharp, like the teeth 
of a saw. 
5. Crenati. Ventral lobe very small; lateral saddle very large, 
rounded, separated from the rounded ventral saddle by a sharp 
lobe. 
6. Acutolaterales. Ventral lobe simple, a lobe and sharp 
saddle on each side. 
7. Magnosellares. Lateral saddle short and wide, lateral lobe 
rounded, ventral lobe thin. 
8. Nautilini. Ventral lobe narrow; sutural lines simply 
arcuated on the sides. 
In some of the Goniatites the first whorls are not in contact, 
recalling the shell of Spirula. 
Arceste, 
Shell smooth or with transverse folds, ribs or strie ; wrinkled 
layer consisting mostly of linear, interrupted strie ; impressions 
of the mantle attachment without or with a but slightly con- 
tracted opening always visible on the body-chamber. Anaptychus 
apparently horny in Arcestes. 
