. Bulletin. Science; Natural history; Natural history. PC. Fig. 5. Single large posterior granular cell (PC) in larva of Clathrina coriacea. Scale, 10 /xm. Fig. 6. Two large posterior granular cells (PC) in larva of Clathrina blanca. Scale, 10 Fig. 7. Larvae of Clathrina blanca; note the varying stages of migration of the blastomeres into the blastocoel (B). Scale, 50 jitm. The oocyte in C. coriacea and C. blanca becomes very granular as it reaches sexual maturity. Similar observations were made by Tuzet (1947) for C. coriacea. Oogenesis is asynchronous in the breeding population of the


. Bulletin. Science; Natural history; Natural history. PC. Fig. 5. Single large posterior granular cell (PC) in larva of Clathrina coriacea. Scale, 10 /xm. Fig. 6. Two large posterior granular cells (PC) in larva of Clathrina blanca. Scale, 10 Fig. 7. Larvae of Clathrina blanca; note the varying stages of migration of the blastomeres into the blastocoel (B). Scale, 50 jitm. The oocyte in C. coriacea and C. blanca becomes very granular as it reaches sexual maturity. Similar observations were made by Tuzet (1947) for C. coriacea. Oogenesis is asynchronous in the breeding population of the two California sponges. Some specimens contain developing oocytes, embryos or larvae, where-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy


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