FORAMIXIFERA OF THE ATLANTIC OCEAN. 



79 



Length, up to 4 mm.; breadth of the proloculum, about 0.5 mm.; 

 of the tubular chamber, about 0.25 to 0.35 mm. 



Distribution. — T3^pe-specimens from Albatross station D2212, in 

 428 fathoms, south of Georges Bank (latitude 39° 59' 30" N.; lon- 

 gitude 70° 30' 45" W.), bottom temperature 40° F. (Cat. No. 9927, 

 U.S.N.M.). The only other stations for this species are D2171, 

 somewhat farther to the southwest, in 444 fathoms (latitude 37° 59' 

 30" N.; longitude 73° 48' 40" W.), bottom temperature 39.5 F.; 

 D2262, in 250 fathoms, off Nantucket, and D2377, in the Gulf of 

 Mexico. 



The only species of this genus that at all resembles it closely is 

 H. laevigata, from which our species differs in the shape of the pro- 

 loculum and in the closely constricted and tortuous second chamber. 



Hyperammina distorta — material examined. 



Genus PSAMMATODENDRON Norman, 1881. 



Psammatodendron Norman, MSS. in Brady, Denkschr. k. Akad. Wiss. Wien, vol. 



43, 1881, p. 98 (type, P . arborescens Norman); Ann, Mag. Nat. Hist., ser. 5, 



vol. 8, 1881, p. 404. — EiMER and Fickert, Zietschr. Wiss. Zool., vol. 65, 



1899, pp. 670, 673. 

 Hyperammina (part) H. B. Brady, Rep. Voy. Challenger, Zool., vol. 9. 1884, 



p. 262.— Goes, Kongl. Svensk. Vet. Akad. Handl.. vol. 25. No. 9, 1894, 



p. 18.— Rhumbler, Arch. Prot., vol. 3, 1903, p. 260. 



Description, — Test attached by the bulbous proloculum, remainder 

 of test free and erect, dichotomously branching, tubular, of even 

 diameter throughout, wall arenaceous with ferruginous cement, open 

 ends of the tubes serving as apertures. 



psammatodendron ARBORESCENS Norman. 



Plate 30, figs. 1, 2. 



Psammatodendron arborescens Norman, MSS. in H. B. Brady, Denkschr. k 

 Akad. Wiss. Wien, vol. 43, 1881, p. 98; Ann. Mag. Nat. Hist., ser. 5, vol. 8j 

 1881, p. 404.— EiMER and Fickert, Zeitschr. Wiss. Zool., vol. 65, 1899; 

 p. 670. 



Hyperammina arborescens' H. B. Brady, Rep Voy. Challenger, Zoology, vol. 9j 

 1884, p. 262, pi. 28, figs. 12, 13.— Wright, Proc. Belfast Nat. Field Club, 

 1884-85, App. IX, 1886, p. 319, pi. 26, fig. 1.— Goes, Kongl. Svensk. Vet. 

 Akad. Handl., vol. 25, No. 9, 1884, p. 18, pi. 4, figs. 63, 64.— Chapman, 

 Proc. Zool. Soc. London, 1895, p. 13. — Schaudinn, Bergens Mus. Aaborg, 

 1894-95, No. 9, p. 5.— Rhumbler, Arch. Prot., vol. 3, 1903, p. 260, fig. 102 

 (in text). — Awerinzew, Mem. Acad. Imp. Sci. St. Petersburg, eer. 8, vol. 29, 

 No. 3, 1911, p. 11. — IIeron-Allen and Earland, Trans. Linn. Soc. London, 

 vol. 11, pt. 13, 1916, p. 220. 



