. Fresh-water biology. Freshwater biology. THE FREE-LIVING FLATWORMS (TURBELLARIA) 359 ,---^v. â V ^ ! end. Eye spots elongated, crescentic, facing outward and forward at an angle of 43° to the chief axis of the worm. Intestine of the simple triclad type; no fusion or anastomoses of posterior stems. This description is from a single immature alcohohc specimen. (It is quite possible that the apparent lack of cephalic appendages is due to the effect of the killing fluid.) Collected off N. Y. Point, Lake Mich. â «""?v â V .âiui^ Fig. 637. Planaria simplex. From preserved material. X 1
. Fresh-water biology. Freshwater biology. THE FREE-LIVING FLATWORMS (TURBELLARIA) 359 ,---^v. â V ^ ! end. Eye spots elongated, crescentic, facing outward and forward at an angle of 43° to the chief axis of the worm. Intestine of the simple triclad type; no fusion or anastomoses of posterior stems. This description is from a single immature alcohohc specimen. (It is quite possible that the apparent lack of cephalic appendages is due to the effect of the killing fluid.) Collected off N. Y. Point, Lake Mich. â «""?v â V .âiui^ Fig. 637. Planaria simplex. From preserved material. X 10. (After Woodworth.) 101(84) Without eyes Planaria fuliginosus Leidy 1&51. Length about 5 mm., breadth 4 mm. Body oval, dilated; interiorly flat, superiorly mod- erately convex, fuliginous. Eyes none; in their ordinary position a slightly greater accu- mulation of black pigment upon the upper surface. Mouth a little posterior to the center- Esophagus simple. Rancocas Creek near Pemberton, New Jersey. 102 (83) Normal eyes many, arranged so as to suggest a coronet near the margin of truncated head and extending back near the lateral margins to a somewhat variable distance. Folycelis. Only one species known in this country. Polycelis coronata (Girard) 1891. Length 8 mm., breadth 2 mm. Color fuliginous or sooty, uniform, somewhat darker on the median dorsal region than on margins. Elongated lanceolate. Anterior margin truncated, weakly bilobed or undulating. The numerous eyes are arranged as a coronet or as an arc of a circle, the arrangement being dependent to some extent on size. Pharynx elongated, central. Collected near Fort Bridger, Wyoming. It is quite possible, as Hallez notes, that this is a synonym of the European Polycelis nigra. Fig. 638. Polycelis coronata. From life. X 5. (After Girard.) 103 (80) Pharynges numerous. Phagocata. Only one species known in this country. Phagocata gracilis (Haldeman) 1840. This species was found and recorded by Haldeman; it was
Size: 2815px × 888px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
