In addition, the free models are included: nautilus and lambis truncata shells:
https://www.cgtrader.com/free-3d-models/animals/other/realistic-shells-low-poly
TOPOLOGY
UVMAP AND TEXTURES
Image textures included:
PREVIEWS
The FBX and OBJ files are been exported from Blender 2.78 (-Z Forward, Y Up) and may need some adjustment (textures). In the .obj version there are 7 files for the 7 types of textures.