Lake Maxinkuckee, Physical and Biological Survey 93 



attached to the skin, and the habit of carrying the eggs and young 

 are very interesting but have been frequently described. This is 

 the largest of the Glossiphonids of the United States, the giants 

 of the species attaining a length of four inches and a width of one 

 inch. 



Abundantly represented in the collection from the following 

 stations : 



"July 18, '00, B. W. E.," one specimen ; "Nov. 30, '00, picked 

 from a snapping turtle." numerous specimens presenting much 

 variation in color pattern, some of them bearing young or attached 

 spermatophores ;" "musk turtles, April 10, '01," two small ; "Outlet 

 Bay, under board, June 12, '01, " four specimens with P. rugosa; 

 "Outlet Bay, Nov. 26, 1904 (13-2)," 1 specimen; "on painted turtle, 

 between Lakes Lagoon, Dec. 19, '04," five specimens, one of which 

 bears young; "near Inlet, in Chara, 4-5 ft., Dec. 24. 1904," 1 speci- 

 men ; "back of snapping turtle, Aug. 28, 1906," one large and three 

 smaller examples; "Outlet, Aug. 10, 1906," one; "Oct. 29, 1906", 

 three specimens "on shore on dead turtle and shrew." 



6. PLACOBDELLA RUGOSA (Verrill) 



This large species is readily distinguished in its ordinary 

 phases from the preceding by its very rough and translucent in- 

 teguments and its much broken, mixed color pattern in which 

 brown usually predominates. Although sometimes associated with 

 P. parasitica on turtles it is usually free-living and inhabits the 

 muddy shallows of warm streams and ponds where it is found 

 abundantly attached to the under surface of driftwood or stones. 

 The ordinary food consists of worms, insect larva? and other 

 aquatic invertebrates but blood will also be freely taken. The eggs 

 are carried in early spring in a layer attached to the underside 

 of the leech and covered by a delicate membrane. When with eggs 

 the parent usually attaches itself firmly by both suckers to the 

 under surface of a stone or other firm object and resists removal 

 vigorously. When removed the eggs will frequently be found ad- 

 hering to the foreign object. 



"Nov. 30, '00," four specimens ; "Outlet Bay, under board, June 

 12. '01", four specimens with P. parasitica; "leeches from Kinoster- 

 non odoratum, Apr. 19, 1901," 2 small; "E. Long Pt., by Hol- 

 brunner's Oct. 29, '04," one small specimen with G. fusca and G. 

 complanata; "Long Pt., Nov. 1, 1904". three with attached sper- 

 matophores; "snapping turtle's back, July 28, 1906", two small 

 specimens; "III, 1 H. W. C. 19," one; "III, 1 H. W. C. 19-7," 2 

 small. 



