670 PROCEEDINGS OF THE ACADEMY OF [Sept., 



figures of T. rugulosa hitherto pubhshed, but no valid conchisions as 

 to specific relationships are to be drawn from such. 

 Traclielomonas Stokesiana sp. nov. PI. XLI, figs. 4 and 5. 



Lorica spheroidal, thin-walled, one-tenth longer than broad, at 

 maturity dark brown. Surface with conspicuous, mostly distinct, 

 occasionally anastomosing, continuous ridges, obliquely longitudinal 

 on the sides, strongly spiral at the ends. Aperture a round, bluntly 

 conical, short tube, seated in a shallow circular depression. Monad 

 green, with red pigment-spot. Flagellum long. 



Observed maximum length of lorica IS//. Ponds, Penn Valley, 

 Bucks county, Pennsylvania. 



This species differs from T. rugulosa in the thinner vsall of the mature 

 lorica, in its smaller size, in its shape, and in the character and disposi- 

 tion of the markings. It differs from T. torta in size, shape, aperture 

 and markings. 



It was collected in large numbers at Penn Valle}' during the summer 

 and autumn of 1904. With it were smaller numbers of T. armata, 

 volvocina and hispida. I>ater it was found, but sparsely, in Tinicum, 

 where, however, the remarkable constancy of its characters was again in 

 evidence. The monad moves rapidly in an irregular spiral. I\Iany 

 individuals were observed in the naked condition, and the pigment- 

 spot was then seen without difficulty. 



I am glad of the permission to name this species in honor of Dr. A. C. 

 Stokes, of Trenton, New Jersey, whose w^ork in this and other genera 

 of the Protozoa is known to all students. 



Traohelomonas cylindrica Ehr. 



Trachelomonns cylindrica Ehrenberg. 1S33. Abb. Berlhi. Akad. 



Lorica reddish-brown, narrowly cylindrical, ends slightly flattened, 

 smooth. Aperture plane or produced into a short, straight or oblique 

 tube with smooth limb. Length 25 n. 



Only a few specimens of this have been seen by the writer, all of them 

 coming from Tinicum. They accompanied the following species, 

 which they resembled in a general way, really differing therefrom in 

 loricate characters only in being very much narrower, and mostly of a 

 deeper color. 



Traohelomonas euchlora (Ehr.) comb. nov. 



Lagenella euchlora Ehrenberg. 1833. Abb. BerUn. Akad. 

 Traohelomonas lagenella Stein. 1878. Infusionstbiere, IIL 



Lorica light-brown, elliptical or somewhat C|uadrate, surface smooth. 

 Aperture generally produced into a short oblique tube. Length about 

 33 fj-. 



