794 PROCEEDINGS OF THE ACADEMY OF [DeC, 



vermiform ridges. Aperture quite sinal], ^vithout crater-like area, 

 the edge slightly raised, smooth and rounded. 



Diameter of sphere, 23 a^. 



Height of surface ridges, 2 //. 



Diameter of aperture at top, 2.5 //.. 



Bogs, Ancora, N.J . 



Mounted in air the lorica has a purplish tinge with transmitted 

 light, is purple to yellow with spot-lens, and sometimes violet with 

 top illumination. In Canada balsam, colorless. 

 Trachelomonas spinosa n sp. PI. XXXV, fig. G. 



Lorica spherical, with long, slim neck. Walls transparent, some- 

 what granulate ; spines about 10, hollow, nearly straight, slender, 

 evenly tapering, distributed symmetrically. Neck with a strength- 

 ening ring of silica near the top. Aperture small. 



Diameter of sphere, 13 fi. 



Length of neck, 7 /j'-. 



Greatest length of spines, 12 /*. 



Bogs, Ancora, N. J. 



Mounted in air, the lorica is nearly colorless by transmitted light, 

 shining purple to violet with spot-lens and with top illumination on 

 dark background. In Canada balsam, colorless and very faint. 

 Traclielomonas minor n. sp. PI. XXXV, fig. 5. 



Lorica spherical, with long, slim neck and one very long caudal 

 spine. Walls transparent, surface showing a few isolated granules. 

 Neck cylindrical, with capillary tube. Caudal spine nearly 

 straight, or somewhat bent or spirally twisted, hollow. 



Diameter of sphere, 9 /x. 



Length of neck, 5 //. 



Length of spine, 17 m- 



Bogs, Ancora, N. J, 



Mounted in air or in Canada balsam the lorica gives color- 

 effects like those of T. spinosa. 



Of the above, T. spiculifera and T. spinosa are fairly plentiful 

 in the Ancora diatomaceous gathering, while T. vestita is not so 

 abundant and T. minor may be called scarce. T. vermiculosa is 

 about as plentiful as T. vestita. All five, however, are represented 

 by numerous specimens, and a great many of each were studied 

 with care. No wide variations from the types, as above given. 



