674 PROCEEDINGS OF THE ACADEMY OF [Sept., 



and in ponds among aquatic plants at Riverton. New Jersey. It pre- 

 sents no notable peculiarities beyond the characteristics of the lorica. 

 The spines are like those of T. bulla and T. piscatoris, being more sparse 

 and slender than in T. hispida. Its very considerable size, and often- 

 times its well-developed color, would preclude the obvious suspicion 

 that it represents an immature state of some other species. Moreover, 

 intermediate forms have not been observed. 



Trachelomonas piscatoris (Fisher) Stokes. 



Laguncula piscatoris Fisher. 1880. Proc. Amer. Soc. Micros. 

 Trachelomonas piscatoris Stokes. 1886. Jour. Trentou Nat. Hist. Soc. 



"Lorica flask-shaped, cylindrical, less than twice as long as broad, 

 the surface clothed by numerous short, conical spines ; both extremities 

 equally rounded, the anterior aperture produced into a smooth, cylin- 

 drical, neck-like prolongation, about one-seventh the entire length of 

 the lorica, the frontal border denticulate and often bearing a row of 

 short, conical spines similar to those on the general surface " 



The length of lorica is given by Dr. Stokes, from whom the above is 

 quoted, at the equivalent of 25-39 j". It is a beautiful and very distinct 

 species, not at all rare in Delaware Valley. It is present in most gather- 

 ings from Tinicum, and it occurs abundantly in lily-ponds at Riverton, 

 New Jersey. In shaded situations, or where the water is poor in salts 

 of iron, the lorica is sometimes light in color and thin-walled. This 

 is probably the form referred to, but not adequately described nor at all 

 figured, by Archer (ISSO, Annals and Magazine of Natural History), 

 who suggested in a tentative way the name T^ acanthophora. 



Trachelomonas horrida sp- nov. PL XLI, fig. 6. 



Lorica ovoid, brown, the general surface tuberculate, beset with very 

 long, nearly straight, prismatic, abruptly pointed spines, longer on the 

 ends than on the sides. Aperture plane, or produced into a short 

 trumpet-shaped tube with wavy limb. Monad green, pigment-spot 

 obvious. Flagellum long. 



Fresh-water ditches. Length of lorica 40 /j-. 



This species is at once separated from all others by the character of 

 the spines, as well as by their distribution. These spines are nearly 

 as long as those of T. armata, but are not confined to certain areas, and 

 are straight instead of curved, angular instead of round in cross-section, 

 and pointed like a dagger. Those on the ends are 6 m to 7 ij- long, those 

 on the sides one-half as long. It is also distinguished from T. armata 

 by the tuberculate surface and the character of the aperture. Col- 

 lected! in living condition in Tinicum ditches, June and July, 1905. 



