. Fresh-water biology. Freshwater biology. 338 FRESH-WATER BIOLOGY 23 (22) Without eyes Microstomum caiidatum Leidy. cp-m-i -ph Length to 3 mm. Commonly in chains of 2 to 8 zooids. Nematocysts in place of rhabdites. Color of integument white, in- testine yellow. Ciliated pits directly dorsal to mouth. Pre-oral portion of intestine short. Anterior end bluntly rounded. Poste- rior end narrower, bluntly pointed, tail-like, elevated. In standing water and small brooks, Monroe Co., N. Y.; near Philadelphia, and in West Twin Lake, Charlevoix, Mich. Fig. 5<jg. Microstomum caudatum. b, brain; p
. Fresh-water biology. Freshwater biology. 338 FRESH-WATER BIOLOGY 23 (22) Without eyes Microstomum caiidatum Leidy. cp-m-i -ph Length to 3 mm. Commonly in chains of 2 to 8 zooids. Nematocysts in place of rhabdites. Color of integument white, in- testine yellow. Ciliated pits directly dorsal to mouth. Pre-oral portion of intestine short. Anterior end bluntly rounded. Poste- rior end narrower, bluntly pointed, tail-like, elevated. In standing water and small brooks, Monroe Co., N. Y.; near Philadelphia, and in West Twin Lake, Charlevoix, Mich. Fig. 5<jg. Microstomum caudatum. b, brain; ph, pharynx; cp, ciliated pit. (After SUliman.) 24 (21) 25 (26) Pharynx opens into anterior end of the intestine, which has short lateral diverticula Subfamily Macrostominae. Only one genus Macrostomum . 25 Chitinous portion of copulatory organ a broad straight funnel with the slender point bent at a right angle or nearly so and bearing on its convex side the small opening. Vesicula seminaUs and vesicula granulorum connected by a narrow tube. Macrostomum appendiculatum (O. Fabricius) ..^â f" \ This is the form known as M. kysirix Oersted 1843. Length 2 mm. Unpigmented, transparent. Body flattened especially at the ends. The spatulate posterior end set with adhesive papillae. Rhabdoids and long sensory hairs conspicuous. Two eyes, black. Protonephridial tubes open on median dorsal side back of the sUt-like mouth. Testes and ovary both paired. Asexual reproduction not known. In running and standing water. Monroe Co., N. Y.; Lin- coln, Neb. Fig. 600. Macrostomum appendiculatum. (A) Entire worm: b, brain; e, eye; ph, pharynx; di, diverticulum of intestine; *, intestine; te, testes; vd, vas deferens; vg, ductus seminaUs; vs, seminal vesicle; vg, vesicula granu- lorum; ch, chitinous spicule of cirrus; ^ and $, male and female genital pores; ow, ovary. X35. (After von Graff.) (B) Chitinous spicule eolaiged. X 350, (After Luther.). Please note that these images are extracte
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
