No. 473] NANTUCKET RHIZOPODS 



373 



I Pond. The specimens of this species differ from those of 

 t of the others in being of at least medium size for the species. 

 :. Euglypha ciliata Ehrenberg. Length 44-65 fx; breadth, 

 20-24 fi; maximum 25-40 ft; aperture, maximum 14.5 fi, 

 10 in. 



This species may be called common. It was found in material 

 from Hummock Pond and in various collections from bog moss. 

 Unlike the preceding species of this genus the specimens as a 

 rule were undersized. 



15. Assulina seminulum Ehrenberg. Length 48 ji; breadth 

 38 /i; thickness 17 /j.. 



Specimens of this species were found in material from the south 

 end of Hummock Pond. They were of small size. 



16. Heleopera sphagni Leidy. Length 145 /i; breadth, max- 



This species was found only once but in that material it was 

 common. It was from sphagnum near the north end of Hum- 

 mock Pond. In size the specimens as a rule were above the 

 average for the species, but were comparatively thin. 



17. Heleopera petricola Leidy. Length 102 breadth 60 »; 

 aperture 39 /x. From sphagnum. 



18. Nebela coUaris Ehrenberg. Length 81-150 /i; breadth 

 58-76 /x; aperture 16-23 From sphagnum. 



19. Nebela caudata Leidy. A single specimen of this rare 

 species was obtained from sphagnum. 



20. Cyphoderia ampulla Ehrenberg. Length 110-112 ><■ 

 breadth 38-46 /i; aperture 10-12 fi. 



In a collection from bog moss near the town this s])e( ies w as 

 abundant, but was not met with elsewhere on the island. Tlu" 

 specimens were of very uniform size and small tor rlic ^i.ct ics. 



21. Trinema enchelys Ehrenberg. Length 2!) TOm; hmulth 



22. Acanthocystis spinifera ( ircf'f. Diann'tiT with spines n. 



