unknown objects

unknown objects

Observation - unknown objects - UK and Ireland. Description: hundreds of small dark coloured blobs found on stones in a valley stream, but only in a six foot stretch of water rather than throughout its length. Each blob was about 4 to 6 mm in length and medium soft to the touch. Could these be egg cases of some sor

hundreds of small dark coloured blobs found on stones in a valley stream, but only in a six foot stretch of water rather than throughout its length. Each blob was about 4 to 6 mm in length and medium soft to the touch. Could these be egg cases of some sort?