Help applying the Lycanthropy template.

[henebry]

No. You apply your Con bonus, whatever that may be at the time to all your hit dice. All the line "To calculate total hit points, apply Constitution modifiers according to the score the lycanthrope has in each form," means is that a 10 HD werewolf with Con 16 in human form and Con 20 in wolf form has +30 bonus hit points in human form and +50 bonus hit points in wolf form. At any given time you only apply one Con modifier.

That would make sense to me also, Shhalahr Windrider, and it would match the way other transformations work in D&D: as your form changes, your Con changes, and your HP rise and fall. But for some reason it's not how they calculate Lycanthrope hit points. Go look at the stat boxes for the werewolf or werebear on the d20srd:

Werebear, Human Form, Hit Dice: 1d8+1 plus 6d8+30 (62 hp)
Werebear, Bear Form, Hit Dice:1d8+1 plus 6d8+30 (62 hp)
Werebear, Hybrid Form, Hit Dice: 1d8+1 plus 6d8+30 (62 hp)