There are two types of pendant ocarina. Peruvian, and English.
Peruvian Pendants (8–9 holes) were used as instruments for festivals, rituals, and ceremonies. They can be complex art pieces or smooth and round. These ancient instruments are the forefathers of the Itialian style Ocarina.
English Pendant (4–6 holes) are very small and very portable. The use of the English-style hole system gives these small instruments the range of a full chromatic scale with a minimum of holes. Mathmatician John Taylor brought this instument full circle by combining the ancient design with the modern Western scale.
Referanced from Sound Essentials