AUG 29 1900 
No. 2.— Some North American Fresh-Water Rhynchobdellide, 
and their Parasites.1 By W. E. CASTLE 
CONTENTS. 
PAGE 
I. Introduction. ; 18 e. Nervous System . 
ieeeWethodsigaies. ss ks 18 4. Glossiphonia heteroclita L. 
Ill. Classification 20 a. Habitat, Form, Size, 
Key to Species 20 Color . See eon 
IV. Description of Species 21 6. Rings, Somites, Eyes, 
1. Glossiphonia stagnalis Li 21 Suckers, etc. 
a. Habitat, Form, Size, c. Reproductive Organs . 
Color . é = PAL d. Digestive Tract . 
b. Rings, Somites, Eyes . 22 e. Nervous System . 
c. Dorsal Gland, Suckers 238 5. Glossiphonia elegans Ver- 
d. Reproductive Organs . 24 Tyee ne ; 
e. Digestive Tract . 26 a. Habitat, Size, Colors 
f. Nephridia 27 6. Surface, Rings, Somites, 
g. Nervous System . 28 Eyes, Suckers . 
h. Metamerism 28 c. Reproductive Organs . 
(1) Number of Somtes 28 d. Digestive Tract . 
a. Structure of a Typ- e. Nephropores, Nervous 
ical Ganglion . 29 System Soa 
8. Fused Ganglia . 29 6. Glossiphonia parasitica 
(2) Somite Limits 31 Saye a ces. © 
2. Glossiphonia fusca, sp. nov. 34 a. Habitat, Form, Shee 
a. Habitat, Form, Size, b. Rings and Somites . 
Color . Se tes BE ce. Eyes, Mouth, Oral 
b. Rings, Somites, Eyes, Sucker 
Suckers SG d. Reproductive Organs : 
ce. Reproductive Organs eS: e. Digestive Tract . 
d. Digestive Tract . 37 f. Nephropores, Nervous 
e. Nervous System . 38 System 
8. Glossiphonia i sp. g. Papille, Coloration . 
nov. : 39 (1) Var. plana . 
a. Habitat, Hara sire (2) Var. rugosa 
Color . 39| V. Mutual Relationships of the 
b. Rings, Somites, yer Species Described . 
Suckers 40} VI. Parasites . 
ce. Reproductive Organs : 
d. Digestive Tract . 
41 | Bibliography she 
41 | Explanation of Plates 
1 Contributions from the Zodlogical Laboratory of the Museum of Comparative 
Zodlogy at Harvard College, E. L. Mark, Director, No. 112. 
VOL. XXxvI. — No. 2. 
