The Collaborative International Dictionary of English v.0.48:

Tube-nosed \Tube"-nosed`\, a. (Zool.)
   (a) Having the nostrils prolonged in the form of horny tubes
       along the sides of the beak; -- said of certain sea
       birds.
   (b) Belonging to the Tubinares.
       [1913 Webster]

WordNet (r) 3.0 (2006):

tube-nosed
    adj 1: having a tubular nose