A LAND PLANARIAN WITH AN ABNORMAL NUMBER 
OF EYES. 
L. B. Walton. 
The land planarians which are relatively common in the 
tropical regions have few representatives in the temperate zones, 
only two species thus far being known from America north of 
Mexico, with the exception of the introduced form, Placoceplialus 
kewense (Moseley) occurring in the hot houses. These are Rhyn- 
chodemus sylvaticus (Leidv) and Rhynchodemus atrocyaneus Wal¬ 
ton, the latter represented by only two specimens and the former 
by ten specimens all belonging to the collection of the Department 
of Biology, Kenyon College. It is therefore of interest to record 
a specimen belonging to the former species which possesses two 
Fig 1. Rhynchodemus sylvaticus (Leidy). A Land Planarian from Ohio 
with an abnormal pair of eyes. A. Entire individual slightly contracted 
(xlO). B. Head showing relative size of eyes (x25). 
pairs of eyes instead of the normal single pair. The individual 
was among five collected July 4, 1904 under the partially decayed 
stem of a Virginia Creeper —Ampelopsis quinquefolia, and the 
peculiarity was not noted until someti ne later when cleared in 
cedar oil preparatory to sectioning. 
The two pairs of eyes are nearly normal in position, the anterior 
pair being 0.26 mm. and the posterior pair 0.33 mm. from the tip 
of the head in the preserved specimen fixed in hot sublimate 
alcohol (Apathy) and somewhat contracted. The anterior pair 
49S 
