From the outset, Somerset found themselves behind the eight-ball, and, once again, their much-vaunted top-order let them down as the top three were back in the changerooms for only 28 runs.
Zander de Bruyn (43 not out) tried in vain to keep the belief going, but with wickets tumbling at the other end, there was never any doubt about the outcome, and when Alfonso Thomas came to the crease at the fall of the seventh wicket, it was much too late to hope for a heroic act similar to the one that kept Deccan at bay in the first match.
Dwayne Bravo bagged two wickets in the final over to take his tally to four for the match.
Earlier, Trinidad & Tobago managed a challenging 150 for nine.
Having elected to bat, the West Indian batsmen attacked from the start, and none of their batsmen went down wondering.
Even though they lost wickets at regular intervals, the batsmen never let up the intensity, and put paid to any shoddy delivery.
Denesh Ramdin scored a run-a-ball 39, keeping the lower order together, and Sherwin Ganga had a late flurry with the willow.
Charl Willoughby claimed three scalps but was rewarded for his efforts by being taken for 35 runs off his four overs.
Teams:
Somerset: JL Langer (capt), ME Trescothick, Z de Bruyn, C Kieswetter (wk), AV Suppiah, PD Trego, JC Hildreth, BJ Phillips, AC Thomas, MTC Waller, CM Willoughby Trinidad & Tobago: LMP Simmons, WKD Perkins, DJ Bravo, D Ganga (capt), DM Bravo, KA Pollard, D Ramdin (wk), S Ganga, D Mohammed, R Rampaul, S Badree