unknown Spring flowering bulbs

I have an unknown bulb that has multiplied like mad!  I dug up 79 bulbs from a one foot square area  [910 cm?], of which 32 are fingernail size!!  And some have 5 or 6 necks!

They look like daffodil bulbs, but the sides, and sometimes the neck, of many of them are a fluorescent lime green!

Daffodil bulbs were once buried in this area, so some may actually be daffodils.  But my hazy memory says daffodils did not bloom there last Spring.  Something else did.

 

Any ideas?

Vicky Eicher