. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Figure 6. PLATE 16 Figure T Figure 4. Drawings of nodule 3686. a. Outside of nodule, b. Face of larger piece showing female mayfly and cluster of eggs. c. Face of smaller piece showing eggs and cavity occupied by female. Figure 5. Mayfly from nodule 3686: sketch of female cavity, and prox- imity of eggs. Figure 6. Stone fly, specimen 2597: a. First larva, length mm.; b. Enlargement of antenna. Figure 7. Miotroctes roiisei, new species, type. Size mm. Robert W. Pennak (1953, Fresh Water
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Figure 6. PLATE 16 Figure T Figure 4. Drawings of nodule 3686. a. Outside of nodule, b. Face of larger piece showing female mayfly and cluster of eggs. c. Face of smaller piece showing eggs and cavity occupied by female. Figure 5. Mayfly from nodule 3686: sketch of female cavity, and prox- imity of eggs. Figure 6. Stone fly, specimen 2597: a. First larva, length mm.; b. Enlargement of antenna. Figure 7. Miotroctes roiisei, new species, type. Size mm. Robert W. Pennak (1953, Fresh Water Invertebrates of the United States. Ephemeroptera (Mayflies), pp. 509-521) states: "In some species the female actually crawls below the surface and deposits on submerged objects. . The eggs are produced in great numbers . . exceedingly small . . sometimes imbedded in a gelatinous ; He further says that mayfly nymphs browse in the substrate, feeding with a grinding action of the mandibles, on algae, or the tissues of higher aquatic plants. Mayflies, after emergence as adults, seldom live over a day (in which they mate and oviposit). The finding of the female and her egg cluster presents the event of one day perpetuated by the catastrophe that involved the lake. 44. 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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