Amphiroa anceps (lamk.) Decsne and A. fragilissima (L) Lamour collected from port Okha and Porbandar are studied in detail for their free and combined amino acid composition. Though protein content and quantity of individual compound was similar in both algae, the former species is richer in phenylalanine, and latter in serine. A. fragilissima was richer of the two in total peptides. Moreover, almost all the compounds are more concentrated and only phenylalanine occur in large amounts in this alga. Non-fruiting A. anceps is rich in free amino acids. In this sample aspartic acid, glutamic acid and histidine occur in fairly large amounts while in the fruiting plants proline is predominant. Calcareous algal proteins seems to be distinctly poor in ∞ -alanine, glutamic acid and proline compared to other algae.