Studies on the ontogeny of Streptopelia senegalensis aegyptiaca (Latham, 1790) 3-Description of the optimum stage of the chondrocarnium: Total body length of embryo: 53 mm

The lordosis of the basal plate, previously observed in the younger stages, is no more evident. The anterior enlargement of the basicranial fenestra has restricted the acrochordal cartilage. The tectum in the present study is called the tectum posterius since it is purely of occipital origin. The metotic cartilage is provided by antero-ventral and posterior processes. Resorption of the antero-dorsal border of the acrochordal plate enlarges the size of the hypophyseal fenestra. The parietotectal cartilage of the anterior half of the nasal capsule is continuous laterally as the paries lateralis nasi. The atrioturbinal cartilage is an outgrowth from the parietotectal cartilage. The maxilloturbinal cartilage develops from the ventro-lateral border of the posterior half of the parietotectal cartilage. The concha nasalis is deep and well formed.