tEOM NEW YOKK, SEW JEKSEY;, AND GEOKGIA. l35 



serve no good purpose. I have, therefore, here recorded as iV. amer'icana a 

 species answering to the following description : " Test wedge-shaped in 

 broad view, rounded at the apex in narrow view, with a thickness equal to 

 about two-thirds of the breadth and 120-175 fx in length," as illustrated 

 by Cash & Hopldnson, pi. 31 (10). 



Length 120-168 /z ; breadth 60-90 fi : aperture 20-23 /^ ; thickness 

 40-50 fx,. 



D istributio)!. Ahsecom {Leiclij) and Lakehurst/ N.J. ; Good Ground, 

 Long Island. 



Var. FALCATA, var. nov. 



Many of the curved tests found in Penney's Pond, L.I., agree in size and 

 structure with normal individuals of this species fonnd there, but the specific 

 characters are so modified that general characteristics must be relied on for 

 their identification, and it is possible that the largest of these forms may be 

 derived from N. tubulosa. 



Length 130-170 fx. 



N. ANSATA, Leidy. 



Leidy, pi. 25. figs. 1-8 (30). 

 At Lakehurst not uncommon in submerged sphngnum. 

 Length 217-242 ix ; breadth, of body 94-110 jx, over horns 130-160 jx ; 

 aperture 40-45 yu, by 27-31 [x ; thickness 60-70 /x. 



N. BAKBATA, Leidl/. 



Leidy, pi. 24. figs. 14-17 (30). 



This species is distinguished from all other species of JSehela by the fine 

 cilia scattered over the surface of the test; they are of uniform diameter, 

 terminating in truncate ends, 10-18 //, in length, less than 0*5 ^x in diameter. 

 They are unaffected by cold sulphuric acid aud become invisible in oil of 

 cloves and in Canada balsam. 



Length 112-126 //, ; breadth 40-50 yu,; aperture 12-17 yu \ thickness 

 35-40 yu. At Good Ground one individual measured only, length 80 //,, 

 breadth 35 yu-, aperture 12 /z. 



Distribution. Lakehurst ; Absecom (Leidy), N.J. ; Good Ground, Long 

 Island ; British Isles (3, 10, 45); Sierra Leone (coll. by Major Wailes). 



N. CAUDATA, Leidy. 



Leidy, pi. 26. figs. 21-24 (30). 



Found in sphagnum on the borders of Trout Pond, Good Ground ; it is 

 rare and the proportion of living individuals observed was small ; some have 

 been kept alive in sphagnum during the winter, but up till the time of 

 writing they have refused to become active. 



LINN. JOUEN. ZOOLOGY, VOL. XXXII. 12 



