92 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



AMMOBACULITES CYLINDRICUS Cushman. 



Rate 17, fig. 5. 



Haplophragmium calcareum (part), H, B. Brady, Rep. Voy. Challenger, Zoologj', 



vol. 9, 1884, pi. 23, fig. 6. 

 Haplophragmium cf^glutinans Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 275, 



pi. 19, fig. 2 {not Spirolina agglutinans d'Orbigny). 

 Ammobaculites cylindricus Cushman, Proc. U. S. Nat. Mus., vol. 38, 1910, p. 



441, figs. 15, 16. 



Description. — Test free, elongate, cylindrical; early chambers 

 planospiral, completely involute, with five to six chambers in each 

 volution; later portion uncoiled, cylindrical, made up of a linear 

 series of chambers; wall coarsely arenaceous, but the surface rather 

 smoothly finished; aperture in the middle of the terminal face in the 

 uncoiled portion simple; color, gray. 



Length 2 mm.; diameter 0.5 to 0.75 mm. 



This species has been foimd to occur at numerous stations thi'ough- 

 out the region, ranging in depth from 18 to 554 fathoms (33 to 

 1,012 meters), most of the stations being between 200 and 400 

 fathoms (366 and 732 meters), bottom temperatures ranging from 

 40.1° to 53.3° F. (3.5° C. to 11.8° C). 



This species differs from the ordinary form of A. calcareus in its 

 cylindrical shape, and from A. agglutinans in the greater proportion 

 of coiled chambers, which are completely involute. 



Ammobaculites cylindricus — Material examined. 



AMMOBACULITES REOPHACIFORMIS Cushman. 



Plate 11, fig. 3; plate 14, fig. 3. 



Ammobaculites reophadformis Cushman, Proc. U. S. Nat. Mus., vol. 38, 1910, p. 

 440, figs. 12-14. 



Description. — Test free, elongate-fusiform; early portion consist- 

 ing of chambers aiTanged in a close-coiled planospiral series, much 

 compressed, later portion straight, Reophaz-like, consisting of a linear 



