Present Participle

Hi
In Lesson 11 of the Pali Primer it has on the "present
participle" >Present participles are formed by adding -nta / maana to
the verbal base.

In Charles Duroiselle's A practical Grammar of the Pali it has -nta
for "Active Present participle" and has -maana for the "Reflextive
Present participle",while the Primer makes no distinction between the
2. Do I have this correct?

If so could someone please explain the differance between a "active"
and a "reflextive" present participle.

Thankyou