Answer: 176 ticks! They are all Ixodes scapularis in various stages of engorgement, although I didn't show you enough detail to identify them.
The winner is Olivier Levoux who has an interesting website devoted to ectoparasites. Go check it out and encourage him to keep up the great work. His count was 153; only 23 less than the actual number, and not bad given that some of the ticks were probably clumped together in my photos. BKS is the runner up, with his guess of 203; only 27 ticks more than the actual number. (Olivier and BKS, as the winner and runner up, I would be happy to send you some ticks if you write to me with your address).
I hope you all had a great lab week.