160 FEESH- WATER EHIZOPODS OF NOETH AMERICA. 



0.056 mm.; thickness of the same 0.036 mm. to 0.048 mm.; breadth of neck 

 0.014 mm. to 0.024 mm.; thickness of the same 0.012 mm. to 0.02 mm.; 

 mouth 0.016 mm. to 0.024 mm. wide. 



Locality. — Wet sphagnum of the cedar swamp of Absecom, and similar 

 localities, New Jersey. 



Nebela baa-hata, represented in figs. 14-17, pi. XXIV, has a slightly- 

 compressed bottle-shaped shell, with a cylindroid neck, which is about as 

 long as the ovoidal body. In the view of the broader sides, the neck is 

 more abruptly defined from the body, the fundus is broadly convex, and 

 the oral end is slightly expanded and convex downward. In the narrower 

 view, the neck is more gradually produced from the body, the fundus is 

 more sloping from an obtusely angular summit, and the oral end is con- 

 cave downward. 



In composition, the shell accords with that of other species, being 

 colorless and transparent, but I have observed it only composed of circular 

 disks. The surface of the shell is furnished with short rigid cils, projecting 

 straight outwardty, apparently from the intervals of the disks. The cils 

 usually cease within a short distance of the mouth. 



The sarcode and its habits in all respects are like those of Nebela col- 

 laris and other species. 



Nebela barbata approximates in size average specimens of N. collaris. 

 The shell measures from ^th to —th. of an inch in length, with the body 

 B ijth to ith of an inch in breadth and ^- th to 5 ^th of an inch in thickness. 



Nebela barbata is not of unfrequent occurrence in wet sphagnum of 

 the cedar swamp of Absecom and similar places in New Jersey. 



Rarely, I have found specimens of Nebela, in the same locality, which 

 have the form and constitution of N barbata, but are entirely devoid of the 

 cils. They may be regarded as a transitional variety toward Nebela collaris. 



NEBELA CAUDATA. 



Plate XXVI, figs. 21-24. 

 Kebela cauclata. Leidy : Proc. Ac. Nat. Sc. 1876, 58. 



Shell compressed ovoid, with from four to five narrow, blunt, conical or 

 clavate processes projecting from the lateral borders and summit of the fun- 



