THE FREE-LIVING FLATWORMS (TURBELLARIA) 



343 



43 (42) With a crown of 8 spines, thickened near the middle and tapering 

 to fine points at both ends. 



Dalyellia blodgetti (Silliman) 1885. 



Length 0.6 mm. Color light brown. 

 A number of sensory hairs on anterior 

 end. Basal piece of the tube which 

 encloses the spines is not chitinous but 

 membranous and placed in the male 

 genital canal which opens into the 

 atrium. Erie canal, Rochester, and 

 Monroe Co., N. Y. 



FIG. 608. Dalyellia blodgetti. (A) En- 

 tire: b, brain; vi, yolk gland; g, cirrus; e, 

 eye; ov, ovary; be, bursa copulatrix; ph. 

 pharynx; 5, salivary gland. X 90. (After 

 Silliman.) (B) Crown of spines from chitin- 

 ous portion of male copulatory organ with 

 opening (o) into the genital canal. From 

 a strongly compressed preparation. Very 

 much enlarged. (After von Graff.) 



Chitinous portion of cirrus bears two longitudinally placed stalks 

 on one end of which either one or two longitudinal terminal 

 branches are set. The terminal branches may be set with 



spines -i;vk 45 



45 (46) Each chitinous stalk bears two terminal branches, one set with 

 spines and one with no spines. 



Dalyellia fairchildi von Graff 1911. 



eae-' 



Similar in size and color to D. rheesi but more 

 slender, with a longer tail and the uterus lies pos- 

 terior to the sexual pore. The egg is round to oval 

 in shape and measures 108 to 140^. Yolk glands 

 open as in D. rheesi through a common yolk duct 

 but are not lobed, barely notched. 



8 FIG. 609. Dalyellia fairchildi. (A ) Male copulatory 

 apparatus. X 430. (B) Chitinous piece enlarged. X 

 850. ds, ductus seminalis; eae, outer branch with spines 

 folded; eat, inner branch with no spines; mv, median 

 projection; pd, opening of cirrus sheath; pp, cirrus pa- 

 pillae; 5, double row of spines; st, stalk; vg, vesicula gran- 

 ulorum; vs, vesicula seminalis; q, transverse bar; qs, 

 transverse spines. (After von Graff.) 



