6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



the pores in the last-formed chambers gives a striate appearance to the 

 basal portion of those chambers. 



SPIRILLINA ARCTICA, n. sp. 



Plate 2, figs. I, 2 



Test small, forming a low hollow cone, the proloculum very distinct, 

 in the megalospheric form often projecting above the other coils 

 prominently, second undivided, close coiled, overlapping very slightly 

 on the dorsal side leaving a depressed hollow cone as it revolves ; suture 

 distinct, very slightly depressed ; wall very finely perforate, nearly 

 transparent ; aperture formed by the open end of the tube. Diameter, 

 up to 0.50 mm. 



Holotype. — U.S.N.M. No. 26149, from the Fox Basin, latitude 67° 

 41' N., longitude 79°9' W., in 38 fathoms. 



This peculiar, small, conical species is fairly abundant in the Fox 

 Basin material, but was not found in any of the collections from off 

 the coast of Greenland. It occurs at the following localities: 25-31 

 fathoms, Fox Basin ; 34-37 fathoms, SE. corner of Fox Basin, latitude 

 66°46' N., longitude 69°i5' W. ; and Fox Basin, latitude 66°43' N., 

 longitude 8o°7' W. 



Parker and Jones figured a small Spirill'ma from 60-70 fathoms off 

 the Hunde Islands, Davis Strait, but only one view of this is given and 

 it is important to see whether it belongs to this new species. Their 

 short note on it does not reveal its characters. Brady also records 

 the species from the sounding in y2 fathoms at latitude 83° 19' N., 

 from the British North-Polar Expedition. These records of Parker 

 and Jones and of Brady being so near the Fox Basin area, it would 

 seem that they refer to the same species we have here described. 



DISCORBIS BARTLETTI, n. sp. 



Plate 2, figs. 3-6 



Test plano-convex, the dorsal side very strongly convex, the ventral 

 side flat, periphery subacute, slightly lobulate ; chambers distinct, of 

 rather uniform shape and increasing regularly in size as added, in- 

 creasing in number until in the adult whorl there are about nine or 

 ten chambers ; sutures on the dorsal side distinct, strongly limbate, 

 gently curved, on the ventral side obscured by the peculiar ornamenta- 

 tion of the surface ; wall on the dorsal side smooth and polished, very 

 distinctly but finely perforate, ventral side with a very complex sec- 

 ondary growth of shell material forming a vesicular mass over the 



