FORAMINIFERA OF THE ATLANTIC OCEAN, 



97 



the more common but doos not attain the size that the adult micro- 

 spheric form does. 



In connection with the bottom temperatures and distribution it 

 seems that this species is more abundant under rather cold condi- 

 tions. As a result it is not surprising to find that in the cold area 

 along our eastern coast it is much more frequently met with than in 

 material from farther south. 



Ammodiscus incertus — material examined. 



Cat. 

 No. 



9544 

 9545 

 9546 

 9547 

 9548 

 9549 

 9550 

 9551 

 9552 

 9203 

 9204 

 9205 

 9552 

 9554 

 9556 

 9206 

 9207 

 9208 

 9209 

 9210 

 9211 

 9557 

 9558 

 9559 

 9212 

 9213 

 9214 



Coll. of- 



U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 

 U.S.N.M. 



No. of 

 speci- 

 mens. 



1 

 2 

 1 

 3 

 1 

 2 

 2 

 4 

 1 

 1 

 9 

 2 

 8 

 1 

 5 

 1 

 4 

 10+ 

 2 

 1 

 1 

 1 



Station. 



10+ 

 1 

 1 



D2003. 

 D2036. 

 D204S. 

 02115. 

 D2144. 

 D2171. 

 D2202. 

 D2203. 

 D2213. 

 D2214. 

 D2234. 

 D2237. 

 D2242. 

 D2263. 

 D2385. 

 D2400. 

 D2504. 

 D2547. 

 D2550. 

 D2552. 

 D2581 . 

 r)2677. 

 10 I D2678. 

 8 D2679. 

 D2680. 

 D2729. 



Locality. 



37 16 30 N.; 



38 52 40 N.; 

 40 02 00 N.; 



35 19 30 N.; 

 9 49 00 N.; 



37 59 30 N.; 



39 38 00 N.; 

 39 34 15 N.; 

 39 58 30 N.; 

 39 57 00 N.; 

 39 09 00 N.; 



39 12 17 N.; 



40 15 30 N.; 

 37 08 00 N.; 

 28 51 00 N.; 

 28 41 00 N.; 

 44 23 00 N.; 

 39 54 30 N.; 

 39 44 30 N.; 

 30 47 07 N.; 

 39 43 00 N.; 

 32 .39 00 N.; 

 32 40 00 N.; 

 32 40 00 N.; 

 39 .=50 00 N.; 



36 36 00 N.; 

 Off Wiskon 



Key West 



74 20 36 W. 



69 24 40 W. 

 68 50 30 W. 

 74 34 45 W. 

 79 31 30 W. 



73 48 40 W. 

 71 39 45 W. 



71 41 15 W. 



70 30 00 W. 

 70 32 00 W. 



72 03 15 W. 

 72 09 30 W. 

 70 27 00 W. 



74 33 00 W. 

 88 18 00 W. 

 86 07 00 W. 

 61 22 45 W. 

 70 20 00 W. 

 70 .30 45 W. 



70 35 00 W. 



71 34 00 W. 

 76 50 30 W. 

 76 40 30 W. 

 76 40 30 W. 

 70 26 00 W. 

 74 32 00 W. 



Rocks, off 

 , Fla. 



Depth 



in 

 fath- 

 oms. 



641 



1,735 

 547 

 843 

 896 

 444 

 515 

 705 

 384 

 475 

 810 

 520 

 58 

 430 

 730 

 169 

 82 

 390 i 



1,081 

 721 

 394 

 478 1 

 731 

 782 

 555 I 

 679 1 

 144 ! 



Bot- 

 tom 

 tem- 

 pera- 

 ture. 



'F. 



39.5 

 39.1 

 38.9 

 39.5 

 39.5 

 38.6 

 39.5 

 51.4 



40.1 



'40.' 6 

 39.6 

 38.5 

 39.6 



39.2 

 38.7 

 38.6 



Character of 

 bottom. 



glob. oz... 

 crs. m. g. . 

 m. fne. s... 



gn. m 



gn.m 



gn. ra 



gn. ra. s... 



gn.m 



gn. m 



gn.m 



gn.m 



gn.m 



gn.m 



gy-ni 



gy. m 



bk. m. g... 



gy. oz 



br. m 



gy-oz 



gn.m 



gn.m 



It. gy. oz.. 

 It. gy. oz.. 



d k. gn. m. 



Abundance. 



Rare. 



Few. 



Rare. 



Few. 



Rare. 



Rare. 



Few. 



Few. 



Rare. 



Few. 



Few. 



Rare. 



Few. 



Rare. 



Rare. 



Rare. 



Rare. 



Abundant. 



Few. 



Rare. 



Rare. 



Rare. 



Few. 



Few. 



Frequent. 



Rare. 



Rare. 



Genus AMMODISCOIBES Cushman, 1909. 



Ammodiscoides Cusiim.\n, Pros. U. S. Nat. Mus., vol. 36, 1909, p. 424 (type. 

 Ammodiscoides turbinatus Cushman).— Ruumuler, Forara. Plankton-Exped., 

 pt. 2, 1913, p. 388. 



Descrij^tion. — Test free, spiral, initial chamber followed by a coiled 

 nonseptate tube the microspheric form at least, with the early por- 

 tion forming a hollow cone; later portions becoming broadly flaring 

 usually slightly concave in the opposite direction from that of the 

 early conical portion, wall finely arenaceous, smooth, aperture ter- 

 minal. 



This genus was split off from Ammodiscus, which is planospiral 

 both in the early stages and the later whorls as well while Ammodis- 

 coides has a definite conical young and broadly flaring later de- 

 velopment. 



