. Fresh-water biology. Freshwater biology. THE FREE-LIVING FLATWORMS (TURBELLARIA) 363 Dalyellia bilineata (Woodworth) Length mm., breadth imn. Anterior end truncated, posterior end pointed. Pharynx dolioUform, in anterior third of body, traversed by two prominent, lateral, nearly lon- gitudinal bands of light chocolate-brown, and numerous other pale indistinct longitudinal lines. Zoochlorellae in central part of the body, posterior fifth free from them, trans- parent-brown. Egg dark chocolate, 120 ^ X 8o*i. _ The figures given here are those which were in possession of W
. Fresh-water biology. Freshwater biology. THE FREE-LIVING FLATWORMS (TURBELLARIA) 363 Dalyellia bilineata (Woodworth) Length mm., breadth imn. Anterior end truncated, posterior end pointed. Pharynx dolioUform, in anterior third of body, traversed by two prominent, lateral, nearly lon- gitudinal bands of light chocolate-brown, and numerous other pale indistinct longitudinal lines. Zoochlorellae in central part of the body, posterior fifth free from them, trans- parent-brown. Egg dark chocolate, 120 ^ X 8o*i. _ The figures given here are those which were in possession of Woodworth with the material when the description was written and the species named. Fig. 64s. Dalyellia bilineata. 4, compressed. X about 50. 7/(i,vas deferens; y5, vesiculaseminalis; 0, ovary; of cirrus; e, egg; be, bursa copulatrix; ys, yolk gland. B, chitinous piece. X about 200. (Unpublished sketch by Ward.) Dalyellia marginatum (Leidy) 1847. Blackish, narrow lanceolate, anteriorly truncate; marginate margin deUcately striate; mouth large; pharynx large and oblong; eyes two, anterior, distant, each consisting of two round masses of black pigment in contact with each other and of which one is larger than the other; generative orifice one-fourth the length of the body from the posterior extremity. Length 2 mm. A single specimen found in ditches near Philadelphia, Pa. Digestive cavity consists of a large capacious sac extending as far back as the posterior third of the body and having a cecum upon each side of the proboscis. The cirrus has a yellow color and consists of a round granu- lar mass with a moderately long and bent spiculum pro- jecting from its posterior part. This is the form de- scribed by Leidy under the name Prostoma marginatum. Fig. 646. Dalyellia marginatum. X about 20. (After Girard.) Derostoma elongatum Schmarda 1859. Fig. 647. Derostoma elongatum. X about 25. (After Schmarda.) The body is long, ribbon-shaped, flattened. Posteriorly uniform
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
