I've didn't find this Nehemiah Smith line in the "Smith Number" of TAG (apparently Jacobus covered this family earlier, in the Bourne appendix to vol. 1 of The Waterman Family in 1939), but I did find a couple of relevant genealogical publications. [I've sent you a private message about this.]
According to the article John and Elizabeth (Smith) Fenner in TAG v. 46 (1970), page 21, Jacobus said that an 1895 genealogy (I'm not sure which) mistakenly gave the immigrant Nehemiah Smith 9 children, but he had only 4 children. Those 4 children seem to be Elizabeth (married Joshua Raymond), Mary (married Samuel Raymond), Nehemiah (married Lydia Winchester), and Mehitabel (married Joshua Abell).
Children of Samuel Smith and Elizabeth (?Ely?) Smith identified in the 1970 article (based on a deed of 20 March 1734/5) were: Nehemiah Smith of Lyme, Samuel, Simon, and Lydia Smith of New London, and Elizabeth (Smith) Fenner of Saybrook (married John Fenner of Saybrook). A deed in 1739 identifies Lydia as the wife of Elijah Beckwith.