ORDERS OF RHIZOPODS— lfAlUOLAKIA. 13 



Ponds, springs, and marshes in the vicinity of Philadelphia, but espe- 

 cially the ditches which traverse the great meadows below the city, in the 

 alluvial triangle called the Neck, between the Delaware River and the 

 mouth of the Schuylkill River. 



Ponds, marshes, etc , along the course of the Delaware River, both in 

 Pennsylvania and New Jersey, from Philadelphia to the Delaware Water 

 Gap. 



Sphagnous bogs, pools, and ponds on the Pokono Mountain, Monroe 

 County, and on Broad Mountain, Schuylkill County, Pennsylvania 



The lower part of the State of New Jersey, along the course of the 

 Camden and Atlantic City Railway, and along the course of the Camden 

 and Cape May Railway. Throughout this broad region materials were col- 

 lected from many localities: ponds and pools, sphagnous bogs, cedar swamps, 

 savannas, and cranberry lands. Also Lake Hattacawana, or Budd's Lake, 

 on Schooley's Mountain, Morris County, New Jersey. 



The vicinity of Noank, on the coast of Connecticut, and of Newport, 

 Rhode Island. 



Bridger Valley, in the southwestern corner of Wyoming Territory, and 

 the Uinta Mountains to the height of 10,000 feet, in the same region. 



Partridge Island, at the head of the Bay of Fundy, Nova Scotia. 



Before entering in detail upon the special subjects of my studies, the 

 Fresh-water Rhizopods, nearly all of which pertain to the orders of the 

 Protoplasta and the Heliozoa, some remarks on the characters of the other 

 orders of the class may not be out of place. 



The Radiolaria (radiolus, a little ray) are the subjects of an ela- 

 borate and magnificent work by Dr. Ernst Haeckel, Professor of Natural 

 History, in Jena.* They are exclusively marine Rhizopods, comprising 

 many wonderfully beautiful forms, living and swimming in vast multitudes 

 in the superficial waters of the ocean. They are generally minute, and are 

 the most complex in their constitution of any of the Rhizopods. They are 

 commonly furnished with a siliceous or flinty skeleton, which, in variety of 

 form, symmetry, and intricacy of construction, is a marvel of beauty. The 

 material of the skeleton is derived from the exceedingly small proportion 



* Die Eadiolaricii (Rhizopoda Radiolaria), Berlin, 1862. 



