10 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Van Duyne (1896) experimented with a form which he states “ war die Pla- 
naria torva von Wood’s Holl.” A study of his figures leads me to believe that 
the species used by him was P. maculata. 1 have found P. maculata to be 
very common at Wood's Holl and elsewhere on Cape Cod, where I have col- 
lected and where I have never met with a species that resembles in any way 
the P. torva of Europe ; nor has that species ever been described from the 
United States. In P. torva the head is not defined from the body by lateral 
cephalic appendages, the anterior end of the animal is simply rounded. The 
contrary is true of the species shown in Van Duyne’s figures, where there is 
indicated a sharply marked angular head and well marked projecting cephalic 
appendages. 
Many of the specimens showed dark spheroidal bodies scattered through the 
parenchyma, as many as fifteen of the bodies occurring in a single individual. 
In sections they proved to be small encysted Trematodes. The cysts measured 
from 0.025 to 1.1 mm. in diameter. I have also met with Tremaiodes in the 
mesenchyma of Bdelloura parasitica. 
Borelli (1895) has called attention to the resemblance of his Paraguayan 
P. dubia to our P. maculata as described by Girard, and has named a variety 
of it P. dubia var. maculata. 
Planaria unionicola, sp. nov. 
Figure &. 
It is with considerable reserve that I offer a new species upon the meagre 
evidence at my disposal, but such data as there are cannot be reconciled with 
descriptions of any known species, There was but one specimen (13,646), 
which was much contracted and shrivelled. It was found creeping on the 
mantle of Unio alatus, dredged from deep water in the Illinois River near 
Havana, August 30, 1895. According to the collector’s notes the general color 
of the animal was “ brownish red... mottled with purplish dots.” On an out- 
line drawing evidently made from the living animal, and which is reproduced 
in Figure 8, the color is also indicated as “light brick red” and the “purple 
dots” as occurring “all over the surface in masses, except at the margins,” the 
dotted line in the figure no doubt representing the limits. The red color is 
also noted as being absent over an elongated posterior median area extending 
nearly to the posterior end of the animal (Fig. 8). The head end has a sinuous 
outline, producing three lobes or rounded projections, a median anterior one 
and two lateral cephalic appendages. There are two eyes occupying the inner 
margins of large circular periocular spaces. The sides are nearly parallel, and 
the posterior end is abruptly rounded, so blunt, indeed, as to suggest an injury 
or that transverse division had taken place. If the clear median elongated 
space indicates the position of the pharynx, its extreme posterior position is 
also indicative of an injury or a division. The color of the alcoholic specimen 
was adeep rusty red. Owing to the crumpled condition of the specimen nothing 
of any internal organs could be recognized, even when subjected to the most 
