So THE LEECHES OF MINNESOTA 



some localities a second brood is raised in late summer. As in most 

 closely related forms the eggs are not attached directly to the body 

 but are contained several together in small mucoid sacs, of which 

 mature individuals bear from eight to twelve or fifteen attached to 

 the posterior ventral surface. When bearing eggs or young the 

 rhythmic oscillating respiratory movements become much more 

 frequent and vigorous than at other times. When disturbed the 

 brood is protected by enveloping it in the margins of the body folded 

 toward the middle line and by rolling into a ball. 



Glossiphonia fusca Castle. 



(Plate I, fig. 3) 



Clepsinc papillifera var. lineata Yerr. (1874) 

 not Hirudo lineata Midler (1774) 

 Glossiphonia lineata Moore (1898) 

 Glossiphonia fusca "Castle (1900) 



Description — The form is rather short and thick and relatively 

 broader than the other small Glossiphonicc described in this paper. 

 In size it is about equal to G. stagnalis but lacks the great power of 

 extension of that species. Typically the back bears three longitu- 

 dinal series of small but prominent sharp conical papilla;, an irregu- 

 lar median series, really formed of a pair of closely approximated 

 series reduced to one by fusion or loss of some of the members, 

 and two dorso-lateral series situated half-way between the middle 

 and the margins. Sometimes two more are added external to the 

 latter, one on each side, but these latter are always very incomplete. 

 There is a single pair of remarkably large eyes situated as in G. 

 stagnalis. No nuchal gland is present. 



Somites I and II are uniannulate or completely united; III and 

 IV are biannulate, the larger annulus of the latter partly divided 

 by an incomplete furrow ai/a.2; V is generally triannulate dorsally, 

 but biannulate ventrally. Somites VI to XXIV are fully trian- 

 nulate, XXV and XXVI biannulate. the latter incompletely in most 

 cases, and XXVII uniannulate. The postanal annulus is very large. 



The mouth is situated as in G. stagnalis but is rather larger and 

 the proboscis wider than in that species. There are six pairs of 

 gastric caeca, strictly simple or slightly lobed, and the first is some- 

 times wanting; the last refiexed as usual. The salivary glands are 

 diffuse but much more extensively developed than in the preceeding 

 species. 



