大乘起信論別記 1.113

1.113

言「轉識」者，是能見相，緣境而轉，名為轉識。然轉識有二：若說無明所動能見名為轉識者，是在阿梨耶識；如其境界所動能見名轉識者，是謂七識。二義不同，不可相濫。又有處說，諸是能見，通名轉識，則通八識。今此中轉相，是緣初義也。

As for "evolving consciousness" (pravṛttivijñāna): this is the characteristic of the perceiver, evolving by taking objects as its condition, hence called "evolving consciousness." However, evolving consciousness has two senses: if one speaks of the perceiver set in motion by avidyā as evolving consciousness, it resides in the ālayavijñāna; if one speaks of the perceiver set in motion by external objects as evolving consciousness, this refers to the seven consciousnesses. The two meanings are not the same and must not be confused. Furthermore, other places state that all perceivers are generically named evolving consciousness, which then applies to all eight consciousnesses. Now, the evolving characteristic here refers to the first meaning.