THE FREE-LIVING FLATWORMS (TURBELLARIA) 



363 



Ddyellia bilineata (Woodworth) 1896. 



Length 0.96 mm., breadth 0.24-0.32 mm. 

 Anterior end truncated, posterior end pointed. 

 Pharynx dolioliform, 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 p X 

 80 . 



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. ^.compressed. X 

 about 50. wf,vasdeferens; vs, vesiculaseminalis; o, 

 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 (Unpublished sketch by Ward.)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 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 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. 



Rhynchoprobolus papillosus Schmarda 1859. 



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 opening central. Phar- 

 Fic.6 4 8. Rkynchoprobolus papittosus. X about ynx rosette-shaped. From brackish water, 

 9. (After Schmarda.) 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). Pharynx 

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

 a little hi 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 



