120 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



Distribution. — Brady described this variet}^ from the northern 

 Atlantic at depths ranging from 130-630 fathoms (238-1,152 meters). 

 The only one definitely placed, so far as I have been able to ascer- 

 tain, is off the West Indies. Flint had this same form from the 

 Gulf of Mexico, off Santa Lucia in the West Indies and perhaps off 

 Cape Fear. Wright ^^ records it from 1,000-1,020 fathoms (1,829- 

 1,866 meters), off the southwest of Ireland. The only other record 

 seems to be that of Chapman, who records it as rare from the Arabian 

 Sea.®® I have had it from four Albatross stations, three of them 

 in the Caribbean, in the general region of Brady's and Flint's records, 

 and the fourth from off the southeastern coast of the United States, 

 where Flint records it. 



This form differs from Cristellaria albatrossi in the clear limbate 

 sutures and in the wing developed at the base of the test which 

 is clear, fairly thick, and yet shows no lines of growth. 



I doubt very much the relationship of this form to Cristellaria 

 obtusata Reuss. As there is already a Cristellaria subalata^ raising 

 this form to specific rank would involve a new name. 



Cristellaria obtusata, var. subalata — material examined. 



CRISTELLARIA ALBATROSSI, new species. 



Plate 19, figs. 4, 5. 



Cristellaria compressa Flint (part) (not D'Orbigny), Rep. U. S. Nat. 

 Mus., 1897 (1899), p. 315, pi. 62, fig. 1 (right-hand specimen). 



Description. — Test composed of two portions, the earlier close- 

 coiled, the later consisting of an uncoiled portion of several cham- 

 bers, the early portion of the test with a thin broad keel, showing 

 very clearly the lines of growth ; chambers fairly distinct but not in- 

 flated except in the latest portion of the uncoiled part; sutures in- 

 distinct, in the early portion, or at least not raised above or de- 

 pressed below the general surface, those of the later portion some- 

 what depressed ; wall smooth ; aperture radiate. 



Length up to 5 mm. 



66 Ann. Mag. Nat. Hist., ser. 6, vol. 4, 1889, p. 449 ; Proc. Roy. Irish Acad., ser. 3, 

 ^vol. 1, 1891, p. 485. 



"« Proc. ZooL Soc. London, 1895, p. 33. • 



