660 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



CRISTELLARIA TUMEDO-COSTATA, new species. 



Test very broadly convex, close coiled, chambers comparatively 

 few in the whorl, sutures marked by a series of very strong raised ribs 

 uniting at the umbilicus, remaining surface between the sutures 

 marked by a series of short well-rounded, parallel costae running 

 obUquely to the axis of growth; peripheral portion of the test also 

 marked by a series of costae parallel to the periphery, or nearly so ; 

 apertural face flattened or concave with a broad rim about the margin; 

 aperture radiate, at the peripheral angle of the chamber. 



Diameter up to 3 mm. 



Tyj^e-specimen.— (Cat. No. 9136, U.S.N.M.), from Albatross D5570, 

 in 330 fathoms, north of Tawi Tawi, Philippines. 



CRISTELLARU TUMIDO-COSTATA, new species, var. LABYRINTHICA, new variety. 



Variety differing from the typical in its shape, which is more tumid, 

 the periphery more broadly rounded than in the typical and the orna- 

 mentation which consists of a peripheral series of costae as in the 

 typical, but the costae above the sutures obsolescent and the inter- 

 mediary costae becoming the prominent sculpture and becoming 

 shorter, irregular, making a labyrinth-like net work of raised ridges. 



Type-sjyecimen.— {Cat. No. 9137, U.S.N.M.), from Albatross D5567, 

 in 268 fathoms, north of Tawi Tawi, Philippines. 



CRISTELLARIA PAUCICOSTATA, new species. 



Test much compressed, composed of few chambers, peripheral 

 border with a prominent keel; the earlier portion of the test with 

 two sharp raised costae toward the periphery and parallel to it, 

 becoming obsolete on the later developed chambers; remainder of 

 surface smooth; sutures slightly depressed; aperture radiate, some- 

 what protruded. 



Length up to 2 mm. 



Type-specimen.— {Cat. No. 9138, U.S.N.M.), from Albatross D5586, 

 in 347 fathoms, off Sibuko Bay, Borneo. 



CRISTELLARIA HELICINA, new species. 



Test unequally convex, close coiled, chambers numerous, on one 

 side coming to the umbilicus or nearly so, on the other coming only a 

 Httle farther than the periphery of the previous whorl; in face view 

 subcarinate; apertural face unequal; sutures ornamented by raised 

 areas, obsolescent at the periphery but gradually increasing in size 

 toward the umbilical end, becoming in some cases a distinct boss 

 toward the umbilicus. Those of the earHer whorls fusing into a par- 

 tial ring about the umbilicus; main surface of the chambers smooth 

 and unornamented; aperture radiate and projecting, on the periph- 

 eral margin of the chamber. 



