160 96. Sailendri, D. and Vr. Muthukkaruppan. 1975. Morphology of lymphoid organs in a cuchlid teleost, Tilapia mossambica (Peters). J_. Morph. 147:109. 97. Sailendri, K. and Vr. Muthukkaruppan. 1975. The immune response of the teleost, Tilapia mossambica, to soluble and cellular antigens. J. Exp. Biol. 191:371. 98. Schmidtke, J. R. and S. Hatfield. 1976. Activation of purified human thymus-deprived (T) cells by mitogens II. Monocyte-macrophage potentiation of mitogen-induced DNA synthesis. J. Immunol. 116:357. 99. Sebesin, S. M. 1965. Lymphocytes of small mammals: Spontaneous transformation in culture to blastoids. Science, 149:1385. 100. Shiigi, S. M. and R. I. Mishell. 1975. Sera and the in vitro * induction of immune responses I. Bacterial contamination and the generation of good fetal calf serum. J_. Immunol. 115:741. 101. Shiigi, S. M., L. S. Fujikawa and R. I. Mishell. 1975. Sera and the in vitro induction of immune responses II. Inhibitory effects of newborn calf sera on primary humoral responses. J. Immunol. 99:876. 102. Smith, A. M., M. Potter and E. B. Merchant. 1967. Antibody forming cells in the pronephros fo the teleost Lepomis macrochirus. J. Immunol. 99;876. 103. Snedecor, G. W. and W. G. Cocharan. 1967. Statistical Methods. The Iowa State University Press, Ames, Iowa. 104. Snieszko, S. F. (ed.). 1970. A Symposium on Disease of Fishes and Shellfishes. American Fisheries Society. Special Publication No. 5, Washington, D. C. 105. Stobo, J. D., A. S. Rosenthal and W. E. Paul. 1973. Murine lympho cytes without detectable theta or immunoglobulin determinates. J. Exp. Med. 138:71. 106. Stolen, J. S. and 0. Makela. 1975. Carrier preimmunization in the anti-hapten response of a marine fish. Nature. 245:718. 107. Strong, D. M., A. A. Ahmed, G. B. Thurman and K. W. Sell. 1973. In vitro stimulation of murine spleen cells using a microculture system and a multiple automated sample harvester. J. Immunol. Methods. 2:279. 108. Swarts, W. P. 1967. System for blood sampling in fish. Turtox News. 45:317. 109. Todd, J. C. and A. H. Sanford. 1948. Clinical Diagnosis by Labora tory Methods. W. B. Sanders Company, Philadelphia.