procephalic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or located on or near the front of the head.

from The Century Dictionary.

• Of or pertaining to the fore part of the head.
• In Crustacea, specifically noting certain lobes or processes which form an anterior part of the wall of the head. See the quotation.
• In ancient prosody, same as macrocephalic.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Zoöl.) Pertaining to, or forming, the front of the head.
• adjective (Zoöl.) that part of the head of an invertebrate animal which is in front of the mouth.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective zoology Relating to, or forming, the front of the head.