1851.J 



289 



RHYNCHODEMUS, Genus noviim. 



Body cylindroid, ob-fusiform. Head continuous with the body, proboscidiform, 

 recurvatile, without tentacular appendages. Eyes two, lateral. Interior struc- 

 ture planaroid. Terrestrial. 



1. Rhynchodemus sylvaticus, Leidy: Pr. A. N. S. v, 241. 



2. Rhynchodemus ? TERRESTRis, Leidy. 

 Fasciola terrestris, Miiller. 



Planaria terrestris, Gmelin: 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. S. v, 242. 

 Body dilated, plano-convex; posteriorly, dilated, constricted, truncated. Head 

 continuous with the body; tentacular appendages none. Mouth inferior, sub- 

 central ; oesophagus protractile, cylindrical. Eyes two. Marine. 



1. Bdelloura PAKASiTiCA, Leidy: ib. 



2. Bdellouka eustica, Leidy: ib. 243. 



3. Bdelloura ? longiceps, Leidy. 



Planaria longiceps, Duges: An. Sc. Nat. 21, 83, PI. 2, fig. 21 ; Diesing: Syst. 

 Helm, i, 207. 



PLANARIA, Miiller. 



1. Planaria maculata, Leidy: Pr. A. N. S. iii, 251 ; v, 225. 

 Dugesia maculata, Girard: Keller and Tiedemann, Nordam. Monatsb. ii, 23. 



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

 thin trapezoidal, the lateral angles formed by an acute, angular, erectile tentacu- 

 lar appendage ; posteriorly sub-acute ; superiorly a little convex, irregularly 

 maculated with black, in the young sometimes with brown ; inferiorly translu- 

 cent whitish. Eyes two, reniform, proximate, situated at the inner side of an 

 oval translucent space. 



Length from 2 to 8 lines. 



Habitation. In ditches and ponds in the neighborhood of Philadelphia ; upon 

 the under side of stones in the Delaware and Schuylkill Rivers, abundant. 



Variety a. Brownish, indistinctly maculated. 



Length 8 lines. 



Variety b. Maculations greyish, indistinct, with the intestine blackish, brown- 

 ish or greenish, frequently with a lighter stripe down the back. 



Length 6 lines. 



Habitation. Schuylkill River, under stones. 



CATESTHIA,* GewM ?iom<OT. 



Body very soft, cylindroid. Head continuous with the body. Mouth infero- 

 terminal; cesophagus amphoraform. Eyes two, deeply seated in the interior of 

 an oval translucent space of the integument. 



Kafto^twi devoro. 



