Seems like the USS Holland was a Hybrid...
Looking at the old navy photos of the Holland on a marine railway and in dry dock gives you a better idea of how streamlined it was..
On the outside, the Holland seems like a pretty advanced design.
Only 25 HP could get the Holland up to 7 knots. That's pretty good for the weight and the considerable 'wetted' surface. And it was 1900..
If you were to strip away the upper deck forward section and look at the basic profile, you will find it's got a lot in common with today's attack subs.
