7 
specimen represents it. The specimen is of the usual convex form and white 
colour, and shows the central cavity. T. vesicularis was also entirely lacking in 
the collection. 
GENUS PSAMMATODENDRON NORMAN, 1881. 
Psammatodendron arborescens Norman. 
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. 8, 1881, p. 404.—-Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 1899, 
p-o70:— Cushman, Bull. 104, U.S. NatrMus., pt. 1, 1918;-p. 79), pl. 30) 
ines: 1.2. 
Hyperammina arborescens H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 
1884, p. 262; pl. 28, figs. 12, 13.—Wright, Proc. Belfast Nat. Field Club, 
1884-85, App. IX., 1886, p. 319, pl. 26, fig. 1—Goés, Kéngl. Svensk. Vet. 
Akad. Handl., vol. 25, No. 9, 1884, p. 18, pl. 4, figs. 68, 64.—Schaudinn, 
Bergens Mus. Aarbok, 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, ser. 8, vol. 29, No. 3, 1911, p. 11.—Heron-Allen and Earland, 
Trans. Linn. Soc. London, vol. 11, pt. 13, 1916, p. 220.—Cushman, Bull. 
L@4--U-S) Naty Mus., pt. 1; 1918; p.. 79}: pl..30; figs..1, 2. 
This species seems to be characteristic of the colder regions of the North 
Atlantic and Arctic Oceans. It is recorded by Awerinzew from the Siberian 
Arctic. In the North Atlantic it is known from off the coast of Norway and 
Great Britain as well as further north off Greenland, Iceland, Nova Zembla, 
and Franz Joseph Land. 
— Only small branching portions were found in the Hudson Bay collection at 
station 3. 
BAMILY-LEEUOLIDAE. 
GENus REOPHAX MonTrort, 1808. 
Reophax curtus Cushman. 
Reophax scorpiurus Goés (part) (not R..scorpiurus Montfort), Kéngl. Svensk. 
Vet. Akad. Handl., vol. 25, No. 9, 1894, p. 24, pl. 5, figs. 160-163. 
Reophax curtus Cushman, Bull. 104, U. S, Nat. Mus., pt. 2, 1920, p. 8, pl. 2, 
figs. 2,°3. 
Test short and thick, composed typically of three chambers, increasing 
rapidly in size as added, last-formed chamber making up a large proportion of 
the test, fusiform or elliptic, axis of the test straight or more often slightly 
curved; wall composed of angular quartz sand grains, with a considerable 
amount of grey cement between; apertural end slightly tapering, without a 
definite neck, the aperture being an opening between three or more sand grains 
at the end of the chamber. 
Length up to 2 mm. 
The type station for this species is Albatross D2458 in 89 fathoms, north of 
the Grand Banks, in very cold water (29.5°F.). Fine, large, typical specimens 
139 
