1902.] NATURAL SCIENCES OF PHILADELPHIA. 793 



Trachelomonas vestita u- sp. Pi. XXXV, figs, i and 2. 



Lorica a sphere, opaque in air, with a prolonged, neck-like aper- 

 ture. Walls of sphere complex, greatly thickened by a complete 

 layer of radiating, closely compacted silicious rods or spicules. 

 General surface of spicular coating showing numerous rounded and 

 confluent terminations, with often a few more prolonged and some- 

 what spine-like. Neck transparent, finely striated longitudinally, 

 flaring, with rounded, everted and somewhat reverted, finely fluted 

 lip. 



Diameter, including spicules, 25 fi. 



Length of spicules, 2.5 fi. 



Length of neck beyond spicules, 6.5 jj.. 



Diameter of lip, 7 fi. 



Bogs, Ancora, N. J 



Mounted in air the lorica shows yellowish-brown by transmitted 

 light, bluish-green with a broAvn edge with spot-lens, and white on 

 dark background with reflected light. In Canada balsam, colorless* 

 and with a conspicuous spicular halo. 



Trachelomonas spiculifera n. sp PI. XXXV, fig. 4. 



Lorica spherical. Wall thickened by a layer of radiating, 

 compacted silicious spicules, less long than in 1\ vestita. Surface 

 of spicular coating showing round, evenly sown, mostly isolated 

 grains, the terminations of spiculse. Aperture small, situated in a 

 hyaline, nearly flat, crater-like area, with an upward -sloping, 

 hyaline edge, which is circular or generally irregularly polygonal. 



Diameter of sphere, 25 fj.. 



Diameter of crater, 7 At. 



Length of spicules, 1.25 fi. 



Bogs, Ancora, N. J. 



Mounted in air the lorica is slightly tinted with chocolate by 

 transmitted light, light bluish-green with spot-lens, and nearJy 

 white on dark background with reflected light. In Canada balsam, 

 colorless and with a spicular halo. 

 Trachelomonas vermiculosa n. sp. PI. XXXV, fig. 3. 



Lorica nearly spherical. Walls somewhat thin, general surface 

 nearly smooth, at maturity adorned with high, rounded, isolated 



' Color-eflfects with these silicious loricse are no doubt due to refraction, 

 interference, etc., and are serviceable or signilicant in specific diagnosis 

 only to a very limited extent. 



