10 bulletin: museum of compakative zoology. 



Van DujTie (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. I have found P.' viaculuta 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 F. 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 

 parenchj'ma, 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 Trematodes in the 

 mesenchyma of Bdelloura 2Mrasitica. 



Borelli (1895) has called attention to the resemblance of his Paraguayan 

 P. dubia to our P. macidoM as described by Girard, and has named a variety 

 of it P. dubia var. maculata. 



Planaria unionicola, sp. nov. 



Figure 8. 



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 Eiver 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 headend 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 a deep rusty red. Owing to the crumpled condition of the specimen nothing 

 of any internal organs could be recognized, even when subjected to the most 



