8 



The Canadian Field-Naturalist 



[Vol. XXXVI. 



8. Body very much depressed; dorsal 

 papillae numerous, pointed and rough; 

 integuments translucent; deeply pig- 

 mented in an irregular mixed pattern 

 in which brown predominates. Pla- 

 cobdella rugosa. 

 AA. Body more or less distinctly divided into an 

 anterior narrower and a posterior broader 

 region, little depressed; eyes when present 

 usually well separated; complete somites us- 

 ually with more than three (six to fourteen) 

 annuli; stomach usually with only a posterior 

 pair of caeca which are more or less 

 coalesced. 



Family Ichthyobdellidae. 



Unrepresented by any species in this collec- 

 tion. 

 II. Mouth large, occupying entire cavity of sucker; 

 pharynx not forming a protrusible proboscis; 

 jaws often present. Gnathobdellae. 

 B. Eyes five pairs, arranged in a regular arch 

 on somites II-VI; complete somites five- 

 ringed; m.uscular jaws usually with teeth 

 present; genital organs highly complex; 

 testes strictly paired (usually nine or ten); 

 stomach with at least one pair of spacious 

 caeca; size large. Family Hirudinidae. 

 e. Jaws prominent; teeth numerous, in one 

 series; caeca along entire length of 

 stomach. 



9. Teeth about sixty-five on each jaw; 

 genital orifices separated by five annuli; 

 copulatory gland pores on somites 

 XIII and XIV; penis short and conical; 

 color dark green above, orange below, 

 the dorsum with metameric median 

 bright red and lateral black spots. 

 Macrobdella decora. 



ee. Jaws rather small and retractile into 

 pits or obsolete; teeth when present few 

 and coarse and in double series; caeca 

 limited to a posterior large pair, the others 

 vestigeal; genital orifices separated by 

 five annuli; no copulatory glands; 

 penis filamentous. 



10. Jaws well developed, each bearing 

 twelve to sixteen pairs of coarse teeth; 

 color variable, green or brown and 

 marked more or less thickly with very 

 irregular non-metameric, usually con- 

 fluent dark blotches. Haemopis mar- 

 moratis. 



11. Jaws vestigeal, no teeth; color simi- 

 lar to 10 but the venter pale and the 

 spotting generally sparser, coarser, 

 more angular and less confluent; very 

 large. Haemopis grandis. 



BB. Eyes three or four pairs (rarely absent), 

 usually one or two pairs on II and two pairs 

 at the sides of the mouth on IV; complete 

 somites five-ringed or more; no jaws; no 

 gastric caeca; genital organs relatively simple; 

 testes numerous, small, unpaired; size medium. 

 Family Erpobdellidae. 



f. Somites five-ringed; none of the annuli 

 conspicuously enlarged or subdivided. 



12. Genital orifices separated by two 

 annuli; atrial cornua simply curved; 

 vasa deferentia reaching forward to 

 ganglion XI; eyes three pairs, the first 

 largest; color pattern generally con- 

 spicuously longitudinally striped. 

 Erpobdella punctata. 



13. Like 12 but color pattern more or 

 less strongly annular. Erpobdella 

 punctata annulata. 



ff. Last annulus (/. 6) of complete somites 

 obviously enlarged and subdivided; eyes 

 usually four pairs. 



g. Atrial cornua spirally coiled. 



14. Genital orifices separated by two 

 annuli; vasa deferentia reaching for- 

 ward to ganglion XI; color pattern 

 plain or irregularly blotched with 

 black. I\[ephelopsis obscura. 



gg. Atrial cornua not spirally coiled but short 

 and simply curved. 



15. Vasa deferentia with loops reaching 

 forward to ganglion XI; genital ori- 

 fices separated by three and one-half 

 annuli; eyes four pairs; nearly pig- 

 mentless. Dina parva. 



16. Vasa deferentia not extending an- 

 terior to atrium; genital pores se- 

 parated by two annuli; eyes three or 

 four pairs; pigment absent or in 

 scattered flecks. Dina feroida. 



GLOSSIPHONIDAE 

 Glossiphonia complanata (Linnaeus) 



"Alexandria Bay, Thousand Islands, N.Y., 

 September 1, 1919. F. Johansen." One speci- 

 men. 



"On stones in Fairy Lake, Hull, Quebec, May 5, 

 1918. F. Johansen." Two specimens. Besides 

 the usual three series of marginal, intermediate 

 and paramedian dorsal white spots there are a 

 few scattered white spo*ts. 



"Ottawa River, near Hull, Quebec, October 13, 

 1918. F. Johansen." Four specimens with Dina 

 parva and Erpobdella punctata. Dorsally these 

 specimens are curiously mottled and sometimes 

 reticulated with brown and white, and the brown 

 lines broken into segments by regular white spots. 

 Ventrally they have a greenish hue. 



