342 



FRESH-WATER BIOLOGY 



40 (41) Spines of unequal size and shape set in a basal piece. 



Dalyellia dodgei von Graff 191 1. 



Length rarely more than i mm Integument colorless. Intestine greenish from contained 

 algae. Mesenchyma mottled with sepia-brown pigment. Eyes black. Found very commonly. 

 Rochester, N. Y. 





Fig. 606. Dalyellia dodgei. (.1) Ventral view slightly compressed. X 65. (B) Male copulatory organ 

 strongly compressed. Explanation of figures: be, bursa copulatrix; cli. chitmous organ; cp. adhesive 

 papillae; i intestine; e, egg; 6, brain; ois ovary; go genital pore; g/», graspmg papillae of pharynx; vg, 

 vesicula granulorum; vi, mouth; mgc, male genital canal; ph, phary^nx; pe, cirrus: pi, mesenchyma pig- 

 ment; rs, receptaculum seminalis; sp, sperm masses; te, testes; vi, yolk gland, vs, vesicula seminalis. Much 

 enlarged. (After von Graff.) 



41 (40) Spines of same size and shape, arranged loosely in a ring without a 



basal piece 42 



42 (43) With a crown of about 16 spines, tapering from base to the point. 



Dalyellia eastmani von Graff 191 1. 



Length 0.3 to 0.5 mm. Color of me- 

 senchymatous fluid pale yellow with 

 spherical bodies which contain cinnamon- 

 brown granules in a clear brown fluid. 

 Rhabdites short and relatively thick and 

 rounded at both ends. Rochester, N. Y. 



Fig. 607. Dalyellia eastmani. {A) Ventral 

 view uncompressed. X loo. (B) Malecopula- 

 tory apparatus. X 600. Explanation of figures: 

 he, bursa copulatrix; be,, blind sack of burs.i; 

 be,,, opening of blind sac; e, egg; g, brain; m, 

 mouth; ge, ovary; go, genital pore; rs, recepta- 

 culum seminis; vs, vesicula seminalis; te, testes; 

 vi, yolk gland; ag, common atrium; 0, opening 

 of the male copulatory organs into genital canal; 

 vg, vesicula granulorum; sp, sperm mass; eh, 

 chitinous crown of spines; da, intestine; pit, 

 pharynx; sb, granules of secretion. (After von 

 Graff.) 



