72 



EISEN 



ENCHYTR^US CITRINUS sp. nov. 

 Text-fig. 42. 

 Defijtition. — Length 17 mm., width .5 mm. Somites 50. Pro- 

 stomimn bkmt. Set£E : laterals, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2 (for 11 

 somites) ,3,3, etc. ; ventrals, the same as the laterals, except o in XII. 

 Clitellum XII-XIII. No sexual papillae exteriorly. Brain slightly- 

 longer than broad, posteriorly convex. Dorsal vessel rises posteriorly 

 (probably in XVI) . Blood deep lemon-yellow. Intestine narrower 

 in somites VIII to X. Spermathec^ with large and thick apical 



ampulla and a 

 distinct and 

 strong duct. 

 Sperm -ducts 

 about three 

 times as long as 

 the funnel. The 

 funnels rather 

 short, sigmoid. 

 Two very min- 

 ute internal pe- 

 nial papillas 

 close to and a 

 little ventral to 

 the spermiducal 



pore. Lymphocytes of medium size, ovoid, tapering toward one end. 

 Nephridia similar to those of E. saxicola. Color deep lemon-yellow. 

 Locality. — Lowe Inlet, British Columbia, Prof. Trevor Kincaid, 

 June 3, 1899. 



Characteristics. — There is considerable doubt whether this form 

 should be arranged as a distinct species or considered a variety under 

 E. saxicola. While it is true that the spermatheca are somewhat larger 

 and slightly different in shape, the main distinction between the two 

 species lies in the shape of the brain and in the color of the blood. 

 The specimens of both M. saxicola and E. citrinus were transmitted 

 to ine in the same bottle and had been collected at the same place and 

 preserved in formalin in the same manner. Still in E. citrinus the 

 blood was deep yellow, while in E. saxicola it was white or uncolored. 

 The brain in the two species is distinct in shape. 



Spermiducal apparatus. — Funnels smaller than in E. saxicola.^ the 

 two small inner papillae close to the spermiducal pore more minute 



Fig. 42. Enchytraus citritiiis. 



