The Hirudinca of Illinois. 493 



Glossiphonia Johnson. 

 Glossiphonia complanata (Linnaeus) Johnson. 



Hirudo complanata Linnaeus (1758). 

 Clepsine elegans Verrill ('74). 



Diagnosis. — Somites I to IV each uniannulate, II and III 

 often imperfectly separated and IV sometimes faintly subdi- 

 vided ; three separate pairs of pigmented eyes in somites II, 

 III, and IV, the first pair commonly crossed by the furrow 

 I-I/III ; V is biannulate ; male pore at XI/XII, female pore at 

 XII a 2/ a 3 ; dorsal cutaneous papilla? low and inconspicuous, 

 principally in four series, no median series; epididymis 

 folded into a long loop which reaches into somite XVIII or 

 XIX; nine pairs of testes (XIV to XXI). 



This is a species well known in Europe, of which figures 

 may be found in Moquin-Tandon ('46, Plate XII.), and dia- 

 grams of the annulation and a description in Blanchard ('96), 

 while Verrill describes the colors of American specimens. 

 It abounds in certain localities under stones in running water, 

 is very active but rolls itself into a ball when disturbed, and 

 feeds chiefly on small snails and annelids. 



Glossiphonia lineata (Verrill). 



Clepsine papillifera, var. lineata Verrill ('74). 

 ? Glossiphonia triseriaUs E. Blanchard ('49). 

 ? Helobdella triseriaUs R. Blanchard ('96). 



This species is almost certainly G. triseriaUs, and I hesitate 

 to give it that name only because E. Blanchard ('96) has 

 stated that the male pore of his specimens is situated at 

 23/24 (XI/XII) instead of one annulus further caudad as in 

 the form here described. 



Diagnosis. — Somites I and II uniannulate, III and IV bian- 

 nulate, and V triannulate ; the single pair of very large eyes 

 situated in IV; male pore at XII al/a2, female pore at XII 

 a%/a 3 ; dorsal cutaneous papilla? conspicuous (owing to black 

 color), generally in three (sometimes in five) longitudinal 



