Fulica americana 577 Aug 29. Univ. Celf. Campres, Alameda Co., Calif. - dated 1-30-50 Bird 30 - A very great amount of spermatid debris present - no meiotic figures apparent - interstitial cells quite abundant - shield enlarged but not greatly enlarged - broadened but not greatly filled out. Bird 56 - Some spermal debris, interstitial cells quite numerous, and prominent, little indication of meiotic activity - shield semi-swollen - only callus is swollen. Bird 63 - Many enlarged follicles, ovary generally active - shield no more than 55. Dated 2-2-50 Bird 77 - About same condition as #63 - but some large cells present in #63 are not present here - this shield is flat - having been maintained so by estrogen - dated 3-17-50 Bird 78 - Interstitial cells abundant, meiotic figures abundant, but all seem to be prophase or metaphase gonial cells - one group of tids (sema) and a few possible cytes, no sperm or spermal debris - shield large SS. Bird 79 - The shield on this bird is a good example of a coat shield. Working from the callus inward are the following layers - The callus itself is composed of a distinct pigmented stratum cornuum. This