114 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



numerous stations; off the northeastern coast of the United States, 

 up to latitude 41° N., southward into the Gulf of Mexico, the Carib- 

 bean, and one station off southeastern Brazil. 



From a study of the original figures and description of Cristellaria 

 variabilis Keuss, it does not seem to me that our common recent 

 species is the same as that described by Reuss from the Miocene of 

 Central Europe. Our specimens usually have only three chambers 

 in the coiled portion and one or two in the later development, the 

 sutures being straight and the general form of the test peculiar. 

 These characters do not occur in Reuss's figure and his description 

 does not indicate them. Cristellaria peregrina as figured by 

 Schwager is undoubtedly the adult of this species, especially of the 

 form which is common in the Pacific. I have given a series of figures 

 showing the development of the species and allowing for the change 

 from the close-coiled test with three chambers in a whorl to the 

 adult character of a peripheral keel, somewhat inflated chambers, 

 and terminal aperture. The amount of variation outside of the 

 changes in development are not great. There is often a small cham- 

 ber developed in senescent specimens, as is shown in some of the 

 figures. 



Cristellaria peregrina — material examined. 



Locality. 



41 11 SON. 

 40 16 50 N. 

 39 42 50 N. 

 15 24 20 N. 

 9 49 00 N. 

 13 34 45 N. 

 39 38 00 N. 

 39 35 00 N. 

 39 59 30 N. 



39 54 45 N. 

 22 35 00 N. 

 28 51 00 N. 

 28 47 30 N. 

 28 43 00 N. 

 28 38 30 N. 

 28 36 15 N. 

 28 34 00 N. 

 28 45 00 N. 

 28 44 00 N. 

 28 41 00 N. 



40 01 45 N. 

 39 47 07 N. 

 39 43 00 N. 

 32 39 00 N. 



66 12 20 W. 

 07 05 15 W. 

 71 01 20 W. 

 63 31 30 W. 



79 31 30 W. 

 81 21 10 W. 

 71 39 45 W. 

 71 18 45 W. 

 70 30 45 W. 



69 29 45 W . 

 84 23 00 W. 

 88 18 00 W. 

 87 27 00 W. 

 87 14 30 W. 

 87 02 00 W. 

 86 50 00 W. 



80 48 00 W. 

 86 26 00 W. 

 86 18 00 W. 

 86 07 00 W. 



70 24 00 W. 



70 35 00 W. 



71 34 00 W. 

 76 50 30 W. 



Character of 

 bottom. 



gy. m., s 



bu. m., s 



for., s 



yl.m.,fne.s. 



gn.m 



wh. crs. s. . . 



gn.m 



gy. oz 



gn.m 



gn.m., s 



wh. CO 



gy-m 



br. gy. m 



It. gy. m 



gn.m 



gy-m 



gy-m 



gy-m 



gy-m 



gy-m 



gn.s.,bk.sp. 



gy. oz 



gn.m 



gn.m 



Abundance. 



Rare. 



Rare. 



Rare. 



Rare. 



Common. 



Frequent. 



Abundant. 



Rare. 



Abundant. 



Common. 



Rare. 



Rare. 



Few. 



Rare. 



Frequent. 



Abundant. 



Common. 



Rare. 



Few 



Few. 



Few. 



Few. 



Few. 



Rare. 



