. Biology in America. Biology. Invertebrate Types 1, Hydra; 2, earthworm; 3, a troehopliore larva; 4, a rotifer; 5, Ba- lanoglossus; 6, Trochosphara; 7, Aiiipliioxus; 8, a tunicate; 9, Bonellia; 10, a fresh water annelid reproducing by fission. Fig. 3, from Korsehelt and Heider after Hatsehek; 4, from K. & H. after A. Agassiz; 6, from K. & H. after .Semper; 9, from Doncaster; the others are original, 9 from a preparation by Powers. Fig. 1, i, intestine; m, mouth; t, ten- tacles. Fig. 2, c, crop; ce, coelome; g, gizzard; i, intestine; m, mouth; n, nerve cord; np, nephridium (kidney) ; s
. Biology in America. Biology. Invertebrate Types 1, Hydra; 2, earthworm; 3, a troehopliore larva; 4, a rotifer; 5, Ba- lanoglossus; 6, Trochosphara; 7, Aiiipliioxus; 8, a tunicate; 9, Bonellia; 10, a fresh water annelid reproducing by fission. Fig. 3, from Korsehelt and Heider after Hatsehek; 4, from K. & H. after A. Agassiz; 6, from K. & H. after .Semper; 9, from Doncaster; the others are original, 9 from a preparation by Powers. Fig. 1, i, intestine; m, mouth; t, ten- tacles. Fig. 2, c, crop; ce, coelome; g, gizzard; i, intestine; m, mouth; n, nerve cord; np, nephridium (kidney) ; sv, seminal vesicles; sr, seminal receptacles; ph, pharynx. Figs. 3 & 4, a, anus; ev, contractile vesicle or bladder; e, excretory duct; i, intestine; m, mouth; mx, niastax (grind- ing pharynx) ; pr, pre-oral, and po, post-oral ciliated rings; pg, pharyn- geal glands; s, stomach; o, ovary. Fig. 6, c, cloaca; e, excretory duct; m, mouth; mu, muscle; pr, pre-oral, and po, post-oral ciliated rings; o, ovary; pg, pharyngeal gland. 102. 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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