154 FRESH-WATER RHIZOPODS OF NORTH AMERICA 



In a specimen from the great sphagnous swamp of Longacoming, 

 Camden County, New Jersey, represented in fig. 14, the sarcode mass was 

 encysted, and the mouth of the shell closed with a laminated epiphragm. 

 The shell was composed mainly of short, narrow, rectangular plates laid 

 together in small patches, and arranged in diagonals, with intervals occupied 

 by round and oval disks. The sarcode ball, about the g- th of an inch in 

 breadth, contained a large and uniformly granular sphere, occupying about 

 three fourths of its capacity, and measuring the ±Ah of an inch in diameter. 

 The material of the ball exterior to the granular sphere appeared to consist 

 of a portion of the original sarcode, retaining a numbei of the brownish 

 food-balls. 



Nebela fldbeUalum I have found most abundantly in the extensive 

 sphagnous swamps of Tobyhanna, Pocono Mountain, Monroe County, 

 Pennsylvania. Here especially I found the oblate spheroidal or neckless 

 variety. The species was associated with N. collaris, Hyalosphenia papilio, 

 H. elegans, etc. In the same swamp grew profusely, at the margin of ponds, 

 the Water Arum, Calla palustris. 



NEBELA CAFJNATA. 



Plate XXIV, figs. 1-10. 



Difflugia carinata. Archer : Proc. Dub. Mic. Club, Dec. 1866, 122. Quart. Jour. Mic. Sc. vi, 1867, 178 ; 



ix, 1869, pi. xx, fig. 12 ; xii, 1872, 195. 

 Nelela carinata. Leidy: Proc. Ac. Nat. Sc. 1876, 118, figs. 10, 11. 



Shell resembling in shape and structure that of Nebela collaris, but 

 provided with a thin keel of chitinoid membrane, commencing above the 

 neck and extending along the lateral borders of the body over the fundus. 

 Sarcode also resembling that of N. collaris in color, arrangement, and con- 

 stitution. 



Size. — Length from 0.144 mm. to 0.24 mm.; breadth from 0.l88 mm. 

 to 0.168 mm.; thickness 0.04 mm. to 0.072 mm.; mouth 0.036 mm. by 

 0.02 mm. to 0.028 mm. by 0.028 mm. ; carina from 0.004 mm. to 0.02 mm. 

 deep. 



Locality. — Moderately frequent in the sphagnous swamp of Absecom, 

 Atlantic County, New Jersey ; occasionally elsewhere in sphagnum. 



Wehela carinata, represented in figs. 1-10, pi. XXIV, is a beautiful 

 species, first discovered by Mr. Archer in Ireland. It is frequent in the 



