to the ventral; smaller suborbicular. Foot impression (!) 4 — 
little behind the hinge margin, and very small.”* The genene 
character is, of course, mainly depending on the muscular 
impressions. 
Relations and Differences.—Shells of this kind, certain species 
of which attain large dimensions in their general shape and om — 
mentation, resemble Jnoceramus, but they are distinguished by 
their muscular impressions and hinge area same characters 
hing mae 
these forms.” See also Clarke’s Sedimentary Formations, 
_ and near the border; one oval, 3 centimétres In its gree 
—— 
k. Brussels, 1876. In which 
* Abridged from Recherches sur les Fossiles paléozoiques de la xX. ee 
- Sud. Australie, par L. G. De Konine: n oe 
of all these fossils are given on beautifully executed lithographs. 
‘ 
