Steve Mullaney top scored with 75 as Nottinghamshire were made to scrap for every run by a determined Somerset attack on the opening day of the LV= County Championship match at Taunton.
After winning the toss, the visitors fought their way to 327 for eight with David Hussey contributing 68, but their progress was checked by left-arm spinner George Dockrell claiming 3-99.
Somerset appeared to have edged the day when they reduces Notts to 270 for eight, but a spirited late stand by Luke Fletcher and Ajmal Shahzad put the visitors in a good position.
Openers Mullaney and Alex Hales put on 31 runs before the latter edged Peter Trego behind in the ninth over and wicketkeeper Craig Kieswetter pounced brilliantly with a diving catch to his right.
It was 65 for two when Michael Lumb fell for 16 due to equally good work in the field by Marcus Trescothick, flying one handed to his left.
An absorbing morning ended with the visitors 93 for two at lunch and, soon after the interval, Mullaney reached a chanceless half-century off 107 balls with nine fours.
He and James Taylor looked to be putting Notts in a strong position, but with the score on 130, Taylor got a touch to a leg-side delivery from Jamie Overton and Kieswetter took his second catch.
Somerset kept plugging away and Mullaney fell seven runs later, edging behind to Overton. The opener had batted for more than three hours and added two sixes his boundary count.
Dockrell claimed his first wicket with the total on 165 as Samit Patel edged a turning delivery and was taken by Trescothick at slip.
It was 186 for five at tea, with Hussey looking a threat on 32. In the evening session Chris Read was dropped on seven by Meschede at fine-leg, pulling a ball from Steve Kirby, who was unlucky to go wicketless.
Hussey moved to fifty off 73 balls, with nine fours and a six, as the pair added 64 in 16 overs before Read carelessly drove Dockrell in the air to cover where Nick Compton took a sharp catch above his head.
Hussey offered a return catch to Dockrell and Andre Adams gave away his wicket by lofting Trego to long-on in the first full over with the second new ball as Notts were reduced to 270 for eight.
But Fletcher and Shahzad then produced an unbeaten partnership of 57 that took some of the gloss off Somerset's day.