272 FRESH- WATER EHIZOPODS OF NORTH AMERICA. 



Size. — From 0.04 mm. to 0.08 mm. in diameter; the central body from 

 0.048 mm. to 0.064 mm in diameter. 



Locality. — Absecom pond, New Jersey. 



Hyalolampe fenestrata is a remarkable Heliozoan, with spherical 

 body composed of a granular basis of protoplasm, enclosed in a thick 

 envelope consisting of minute transparent globules, which, according to 

 Professor Greeff, are silicious in constitution. The globules are loosely 

 coherent, and usualty lie three layers deep, and would appear to correspond 

 with the silicious latticed capsule of Clathrulina. 



The protoplasmic body, according to Hertwig and Lesser, is colored 

 yellowish green, orange, red, or reddish brown. A central nucleus is com- 

 monly obscured from view, and contractile vesicles are absent. 



The pseudopodal rays are simple and straight, like those of Actino- 

 phrys, but commonly few in number. 



I have rarely had an opportunity of observing Hyalolampe fenestrata, 

 having seen but three individuals. These were obtained in Absecom pond, 

 New Jersey, in June and October, 1877. The specimens were larger than 

 the dimensions given by Archer, Greeff, and others, measuring from 0.064 

 mm. to 0.08 mm. in diameter. In none were pseudopodal rays to be 

 detected, though the creatures were evidently alive, as indicated by their 

 feeble gliding motion, and in one individual by a slight change in the shape 

 of the outline. The protoplasmic body was of a pale yellowish color, and 

 contained a variable number of large balls, either vacuoles or food or per- 

 haps both, as seen in fig. 9, pi. XLV. One of the specimens contained 

 several brown, biseptate fungus spores. The silicious globules of the 

 exterior envelope measured about 0.004 mm. 



CLATHRULINA. 



Latin, dalhrus, a lattice. 

 Clathrulina: Cienkowsld, 1867. Fodosphmra: Archer, 1868. 



Animal provided with a spherical, latticed capsule composed of silex, 

 attached by a long filiform stem to aquatic plants or other objects. Con- 

 tents of the capsule consisting of a soft Actinophrys-like body, with the 

 same kind of pseudopodal rays, which project through the openings of the 

 capsule. 



