614 MESSRS. E. HE RON- ALLEN AND A. EARL AND ON 
Common, and attaining large dimensions. Characterized by a thin white 
regular test, deeplj^ ferruginous, and very neatly constructed of fine sand 
with a very considerable proportion of sponge-spicules. 
64. Haplophragmium anceps Brady. 
EafihphrcKjmiuin a>ice2}s Brady, 1884, FC. p. 313, pi. 35. figs. 12-15. 
„ ' „ Millett, 1898, etc., FM. 1899, p. 361, pi. 5. fig. 10. 
„ Heron-Allen & Earland, 1 913, CI. p. 47, pi. 3. fig. 4. 
Two small, but typical specimens. 
Placopsilina tVOrUgnii. 
65. Placopsilina cenomana d'Orhigny. 
Placopsilina cenomana d'Orbigny, 1850, etc., PP. vol. ii. p. 185, no. 758. 
Lituola (Placopsilina) cenomana Carpenter, Parker, & Jones, 1862, ISF. p. 143 
pi. 1] . fig. 14. 
Placopsilina „ „ Brady, 1884, FC. p. 315, pi. 36. figs. 1-3. 
A number of fragments agreeing in structure with this species, but all 
'■' free." It is possible that they may have been originally sessile upon some 
perishable organism. 
DiFFUSiLiNA Heron-Allen 4' Earland. 
Diffusilina^ gen. nov. 
Test sessile, squamous, composed of very finely comminuted sand and mud 
enveloping a tliin labyrinthic layer of chambers. External surface smooth 
and finished, white to grey in colour, furnished with a few sparsely distributed 
pustules of more loosely aggregated material. 
The fragments of calcareous alga furnished many examples of this new 
tj'pe. It is at first very difficult to recognize owing to its colour harmonizing 
with that of its host. Its squamous form and habit of growing only in 
depressions and crevices of the alga add to the difficulty of' detecting it, but 
when once recognized its presence can hardly be overlooked. It may 
possibly be a widely distributed type. 
The affinities of Difusilina are not easily discoverable. The neatly con- 
structed test and high proportion of cement in the finished exterior surface 
indicate the Lituolidas, but it has no close relationship to any previously 
recorded t) pe. We suggest Bdelloidina as its nearest, but still a distant, ally. 
66. DiFFUSiLiNA HUMiLis, sp. nov. (PI. 35. figs. 13-16.) 
Test sessile, of irregular outline, squamous, adapting its growth to 
depressions and crevices on the surface of its host {diffusus = ^o\\veA out, 
spilled). Colour resembling its host, white to grey. External surface 
smoothly finished and flat ; marginal edges thinned out so as to appear 
