THE FREE-LIVING FLATWORMS (TURBELLARIA) 



363 



Dalyellia bilineata (Wood worth) 1896. 



Length 0.96 mm., breadth 0.24-0.52 mm. 

 Anterior end truncated, posterior end fKjinted. 

 Pharynx dolioliform, in anterior third of b(xiy, 

 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 m X 

 80 M- 



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. 645. Dalyellia bilineata. i4, compressed. X 

 about 50. z)d,vas deferens; j)x, vesiculaseminalis; 0, 

 ovary; c,chitinous portion of cirrus; e, egg; be, bursa 

 copulatrix; yg, yolk gland. B, chitinous piece. X 

 about 200. (Unpublished sketch by Ward.) 



Dalyellia marginatum (Leidy) 1847. 



Blackish, narrow lanceolate, anteriorly truncate; marginate margin delicately 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 mar fiinatum. X about 20. (.^fter Girard.) 



Derostoma elongatum Schmarda 1859. 



Fig. 647. Derostoma elongatum. X about 25. 

 (After Schmarda.) 



The body is long, ribbon-shaped, flattened. 



Posteriorly uniformly tapering. Color red- 

 dish-gray. Length 2 mm. Without eyes. 

 Mouth opening elliptical. Pharynx long, cask- 

 shaped. From brackish water in swamp, New 

 Orleans, La. 



Rhynchoproholus papillosus Schmarda 1859. 



n\Uil-lJill-LU.IJiUfUll.'.U.ujj^ 



tP^S^fei 



^^miifnjn'Tnmiwlmmmm^ 



Fig. 648. Rhynchoprobolus papillosus. X about 

 9. (After Schmarda.) 



Body somewhat compressed, anteriorly 

 rounded, posteriorly gradually tapering. Color 

 clear yellow. Length 5 mm. Without eyes. 

 Proboscis short, round, externally set with 

 small papillae. Mouth oF>cning central. Phar- 

 ynx rosette-shaped. From brackish water, 

 Hoboken, N. J. 



Vortex (?) cavicolens Packard 1883. 



Found in X cave, one of the Carter caves, Kentucky. Body flat, elongated, narrow lan- 

 ceolate-oval, contracting in width much more than is usual in Vortex (Dalyellia). Phar>-nx 

 is situated much farther back from anterior end of body than is usual in Vortex, being placed 

 a little in front of the middle of the body; it is moderately long, being oval in outline. The 

 body behind suddenly contracts just before the somewhat pointed end. The genital outlet 



