The term "cephalopoda" refers to these 2 body parts
These fins, therefore, are at the "terminal" or posterior end of the body and 
are... [DOC] [TLE] Cephalopod | Define Cephalopod at Dictionary.com [PAR] Cephalopod definition, any mollusk of the class Cephalopoda, having ... and 
here is a tail, and the rest of the body is probably under the railroad track.