no THE LEECHES OF MINNESOTA 



latory glands at the same time coiling somewhat about each other. 

 Cocoons are formed and deposited in the mud by the side of the pond, 

 and there left to hatch. 



Genus Haemopis Savigny. 



Size large to very large. Dorsum plain or marked by a median 

 stripe or by irregular non-metameric spots and blotches. Jaws small 

 and bearing a few large double teeth, or absent ; one pair of posterior 

 gastric caeca only. Genital pores separated by five rings ; no copulatory 

 glands ; penis filiform ; atrium and vagina both much elongated. Food 

 chiefly worms, insect larvae, etc., not normally blood-suckers. 



Haemopis marmoratis (Say) Moore. 



(Plate IV, fig. 32) 



Jlirudo mannorata Say (1824) 

 Anlastomum lacustre Leidy (1868) 

 Haemopis marmoratis Moore (1901). 



Description — The size is medium, seldom exceeding six inches in 

 length and one-third of an inch in diameter, though larger specimens 

 are sometimes met with. Owing to the extensive development of 

 botryoidal tissue the body is exceedingly soft and limp and conse- 

 quently varies greatly in shape. Compared with the other species of 

 Hcemopis described in this paper the form is rounder and less flattened 

 than they, except in swimming, when this species also becomes flat- 

 tened. , 



Although the anterior sucker is relatively large and the lips broad, 

 the unsegmented margin is very narrow and there are no distinct in- 

 ferior sulci as in Macrobdella. Of the five pairs of eyes the first three 

 pairs are conspicuous and are arranged in a regular arc on the first 

 three annuli ; the fourth and fifth are on the sixth and ninth annuli 

 respectively and are much more obscure, being deeply placed. All 

 of the eyes are smaller than the corresponding ones of Macrobdella. 

 In mature individuals the clitellum is very distinct and equally well 

 developed dorsally and ventrally and often is the widest region of 

 the body. It extends over fifteen annuli, from X &5 to XIII a J in- 

 clusive. The posterior sucker is relatively small, circular and broadly 

 attached; about one-third of it projects beyond the body posteriorly 

 and its anterior margin reaches to XXV o2. 



Somite I can seldom be distinguished from II which again is im- 

 perfectly separated from III; IV is biannulate, as is V also, but the 



