RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 7 1 



2. RhyncJiodemiis f Terrestris, lycidy. 



t'asciola terrestris, M tiller. 



Planaria terrestris, Graelin, Syst. Nat., 3092 ; Diiges, An. Sc. Nat., 

 21, 82, pi. 2, fig. 18; Oersted, Entw. d. Plattw.; Diesing, Syst. 

 Helm., i, 206. 



Bdelloura, Leidy. Proc. a. N. vS., v, 242. 



Bod}' dilated, plano-convex ; posteriorly dilated, constricted, trun- 

 cated. Head continuous with the body ; tentacular appendages 

 none. Mouth inferior, sub-central ; oesophagus protractile, cylin- 

 drical. Eyes two. Marine. 



1. BdeUoura Parasitica, Leidy. lb. 



2. BdeUoiira Rustica, Eeidy. lb., 243. 



3. BdeUoura f Longiceps, Eeidy. 



Planaria longiceps, Duges, An. Sc. Nat., 21, 83, pi. 2, fig. 21 ; 

 Diesing, Syst. Helm., i, 207. 



Planaria, Muller. 



I. Planaria Macnlata, Leidy: Pr. A. N. S., iii, 251 ; v, 225. 

 Dugesia maculala, Girard : Keller and Tiedemann, Nordam. Monatsb. , 

 ii, 23. 



Body thin, .spatulate, with sharp, nearly parallel, lateral margins ; 

 anteriorly thin trapezoidal, the latter angles formed by an acute, 

 angular, erectile tentacular appendage ; posteriorly sub-acute ; su- 

 periorly a little convex, irregularly maculated with black, in the 

 young sometimes with brown ; inferiorly translucent whitish. Eyes 

 two, reniform, proximate, .situated at the inner side of an oval trans- 

 lucent space. 



Length from 2 to 8 lines. 



Habitation. — In ditches and ponds in the neighborhood of Phila- 

 delphia ; upon the under side of stones in the Delaware and Schuyl- 

 kill rivers, abundant. 



Variety a. — Brownish, indistinctly maculated. 



Length 8 lines. 



Variety b. — Maculations grayish, indi-stinct, with the intestine 

 blackish, brownish, or greenish, frequently with a lighter stripe 

 down the back. 



Length 6 lines. 



Habitation. — Schuylkill river, under stones. 



