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¹ Mustafa Kemal Üniversitesi Deniz Bilimleri ve Teknolojisi Fakültesi, 31200 İskenderun, Hatay DOI : 10.17693/yunusae.v2014i21953.235710 Viewed : 2900 - Downloaded : 2579 In this study, the shells tructure of Anodonta pseudodopsis (Locard, 1883) and Unio terminalis (Lea, 1863) found in Gölbaþý are examined at macro and micro level and the fitness to productýon of pearl is searched. At macro level; thetickness, brightness, colour of theshell, the form and colour of periostracum layer, the layer of the nacre are examined and the measure of the shell is made by length, hightness and widht. In thesearch at micro level; the surface layers morphology at periostacum, nacre and vertical of shell is examined in scanning electronmicroscope. At the end of these examinations, it is measured that the tickness of periostracum A. pseudodopsis is 1.83±0.83 mm, it lenght is 125.74±9.7 mm, width is 43.44±5.03 mm and height is 82.18±4.57 mm. It is identified that the form of the shell is swollen from the sides and the top wiev is like oval egg. It is found that the layer of periostracum is light and darkbrown, nacre is palecopper and brigh tsilver, the platetickness of nacre is 1±0.5 μm. It is measured that the shell tickness of U. terminalis is 2.87±0.34 mm, the lenght is 82.96±3.93, width is 28.90±1,66 mm and height is 46.49±1.62 mm. The platetickness of nacre is 1.5±0.6 μm and is colour is cream-silver. It is identified that the shell colour is dark and red tones brown, flottened from sides, longitudinal oval from top. It is determined that the form of nacre plate, in A. pseudodopsis, is mostly quadrilateral or pentagonal, sometimes hexagon while U. terminalis is pentagonal or mostly hexagon. Keywords : Anodonta pseudodopsis, Unio terminalis, nacre, shell structure and prysmatic structure