For example, some Cuttle-fishes or Cephalopoda have eight arms or tentacles and others ten.

The Mollusks were also represented then, as now, by their three classes,-Acephala ,Gasteropoda ,andCephalopoda.

Therefore, we may infer that the simplest forms of the Cephalopoda took precedence of the more complex in time.

The third and highest class of Mollusks has been called Cephalopoda, in reference again to a special feature of their structure.

French fishermen give them the name "cuckoldfish," and they belong to the class Cephalopoda, family Dibranchiata, consisting of themselves together with cuttlefish and argonauts.

"Squid, ordinary squid from the class Cephalopoda?"