Lavine, the Barbados opener and fast bowler, and batting off-spinner Jack, of St Vincent and the Grenadines (SVG), are among a flurry of all-rounders included in the squad.
Experienced wicket-keeper Stephanie Power, who has appeared in two previous World Cup tournaments-1993 in England and 1997 India-has been retained as captain.
Nelly Williams is vice-captain of the team and is one of seven players from Trinidad and Tobago in the squad.
The selection of the squad was made at the end of a week-long training camp in Trinidad, the second of three warm-up camps held as part of preparation of the national side for the showpiece event.
The final camp will be held on February 19 over two weeks in Trinidad and Tobago and Barbados.
The West Indies women will play New Zealand in their opening World Cup match on March 22 at Harlequins, and the other participating teams in the tournament are Australia, England, India, South Africa, Sri Lanka, and Ireland.
West Indies failed to qualify for the 2000 tournament but, along with Ireland, came through a qualifying tournament in Holland in 2003.
Squad-Stephanie Power (captain), Nelly Williams (vice-captain), Philippa Thomas, Cordell Jack, Debbie-Ann Lewis, Envis Williams, Felicia Cummings, Indomatie Goordial, Juliana Nero, Kirbyina Alexander, Nadine George, Pamela Lavine, Anisa Mohammed, Shane de Silva, Verena Felicien.