These are various large round or bilobular skulls which are very different from a normal human skull. Some of them have been found among the South-American elongated skulls. I think it is another example of DNA mutations some people were born with.
The following two skulls were photographed by Robert Connolly on his trip around the world during which he was collecting materials about ancient civilizations. The discovery of unusual skulls was thus an unintended “spinoff” of his efforts. Robert Connolly published his photographs on a CD-ROM, titled “The Search For Ancient Wisdom”, Cambrix, 1-800-992-8781, in 1995.
1. A bilobular skull, of unknown origin, also photographed by Robert Connolly, has a cranial capacity that can be estimated safely above 3000 ccm mark.
What is noticeable about the remnants of the facial portion is that the characteristics are entirely within the range of a normal human skull. The two protruding “lobes” are highly anomalous.
2. The next skull has eye sockets which are about 15% larger than that of a normal human. More significant is the enormity of the cranial vault. The estimated cranial capacity ranges between minimum of 2600 cm3 to 3200 cm3.
Another one, two different views:
The National Museum of Archaeology,
Anthropology, and History of Peru:
Museum in Huaraz, Peru:
In 2011, 2 km from the Teotihuacan Archaeological Zone, more than 30 human burials were found, which were about 1,450 years old. There were four children between 4 and 10 years of age, which had a bulbous skulls. The picture shows one of them.
A bilobal skull without any reference:
A large bulbous skull from Paracas, tucked away in a box: