6o DISCOVERY REPORTS 



154, it has a rather striking appearance owing to the contrast of the black sand with the 

 copious grey cement used for building purposes. At St. 140 and WS 33 spicules were 

 utilized as well as sand grains, a rather unusual occurrence, those at the latter station 

 being left projecting, perhaps to act as supports, though their irregular disposition does 

 not show much evidence of selection. 



57. Psammosphaera parva (Flint). 



Psammosphaera fiisca, de Folin, 1895, SRR, p. 16, pi. O, figs. 4, 5. 



Psammosphaera parva, Flint, 1899, RFA, p. 268, pi. ix, fig. i. 



Psammosphaera parva, Heron-Allen and Earland, 1912, etc., NSG, 1913, p. 17, pi. ii, figs. 7, 8. 



Psammosphaera parva, Cushman, 1919, RFNZ, p. 594, pi. ixxv, fig. 3. 



Eight stations: 20, 28, 29, 42, 144, 149; WS 33, 46. 



Rare or very rare at all the stations and seldom as neatly constructed as usual. Only 

 a single specimen of the selective form, which is transfixed by a sponge spicule, was 

 found at St. 144. 



58. Psammosphaera rustica, Heron-Allen and Earland (Plate I, fig. 27). 



Psammosphaera rustica, Heron-Allen and Earland, 1912, etc., NSG, 1912, p. 383, pi. v, figs. 3, 



4; pi. vi, figs. 2-4. 



Psammosphaera rustica, Cushman, 1918, etc., FAO, p. 37, pi. i.x, figs. 3, 4; pi. x, figs. 2-4. 



One station: 144. 



A single large specimen. It is not so highly selective as the types from the North 

 Sea, the body of the test being constructed of fine sand and cement, but it possesses the 

 characteristic projecting spicules. 



Genus Pelosphaera, Heron-Allen and Earland, 1932 



Test large, free, roughly spherical, constructed of large and small irregularly shaped 

 mineral grains joined firmly together with copious cement, which externally is soft and 

 friable, but internally firm and smooth. Furnished externally with two or more pro- 

 jecting processes, conical in shape, hollow, formed of fine sand grains and loosely 

 aggregated mud and cement, similar in appearance to the external cement between the 

 sand grains of the test. There is no visible external aperture to either the test or the 

 processes, but the processes extend from, and conceal, large apertures in the test, which 

 are clearly seen from the inside, when the sphere is laid open. 



This is a very distinctive form in the perfect condition, but the conical processes are 

 so friable that few specimens retain them throughout the cleaning process. Devoid of 

 processes, the specimens, except for their abnormal size, would pass for Psammosphaera 

 fiisca, the apertures being usually concealed by mud. Only a few young individuals were 

 found. These bear two processes only, sometimes almost equalling in length the 

 diameter of the sphere, and usually, but not always, built of smaller sand grains than 

 those employed by the adult organism. 



