4a 



Canadian Arctic Expedition, 1913-18 



somites. Ovaries and oviducts usually paired in one or two somites next 

 posterior to one with atria, sometimes otherwise arranged. Spermathecae 

 usually three to five pairs, number highly variable; commonly in somites 

 posterior to those containing the atria. 



Lumbriculus variegatus (0. F. Miiller.) 



Length, 40-80 mm. Diameter, 1-1 • 5 mm. Number of somites, 140-200, 

 or more. Colour in life, reddish to dark brown, anteriorly greenish. Prosto- 

 mium rounded conical, length about one and one-half times the basal width. 

 Spermiducal pores usually on 8, less frequently on 7, rarely on 6, 9, 10, or 11. 

 Oviducal pores, one to three pairs, often asymmetrically arranged, more com- 

 monly one pair on 9. Spermathecal pores highly variable in number and 

 position, nearly always posterior to spermiducal pores and on three or more 

 somites. Spermaries and spermiducal funnels variable in number and position, 

 usually associated with tl;ie atria and more commonly a pair of spermaries and 

 one or a pair of funnels in 8. Ovaries and oviducts variable in number and 

 position, more commonly a pair of each in somite next posterior to atrial somite. 

 Spermathecae highly variable in number and position, more commonly three 

 to five pairs in 9-13. 



This species is represented in collections from the following localities, 

 mentioned in order of distribution from west to east; the accompanying data 

 are given as supplied by the collector: Konganevik Point (Camden bay), 

 Alaska, June 25-26, 1914, in mud at margin of lake. Collinson point (in Camden 

 bay), Alaska, June 13, 1914, in mud in tundra pond (margin). Herschel island, 

 Yukon Territory, July 30-31, 1916, pond in tundra swamp at east end. Cape 

 Bathurst, Northwest Territories, July 26, 1916, waterhole in brook, swamp 

 (tundra). Bernard harbour, Northwest Territories, June 28, 1915, in mud at 

 margin of tundra pond; July 13, 1915, from green algae in streaming water 

 (tundra); September 30, 1915, in bottom mud of big lake, one fathom water; 

 June 6, 1916, in mud of tundra pond (shallow). 



Fig. 1. Fio. 2. 



Diagrams showing distribution of reproductive organs in two specimens of Lumbriculus 

 variegatus. Numerals designate ihe somites; a,, atrium; of, oviducal funnel; oy, ovary; sf, 

 spermiducal funnel; st, spermatheca; sy, spermary. 



. Seven specimens of L. variegatus, among a total of about twenty, have at 

 least traces of atria, and in each case they are paired in 8 and spermaries are 

 paired in the same somite. Spermiducal funnels are found in but four of these 

 and are also paired in somite 8. In each of the seven specimens having atria, 

 paired ovaries and oviducts are contained in 9; an additional pair of well- 



