78 MK, J. M. BROWN ON SOME NEW AND 



dome, with upturned margin. The margin is more flexible than the rest 

 o£ the test and presents an irregular rim^ generally outwardly and upwardly 

 curved. In the retracted animal the " mouth ^' becomes completely closed. 



The test exhibits a double contour with cross-striations. Under high 

 powers, in surface view it shows numerous dots of different sizes, which take 

 up stains (kresyl-bhiu and neutral-red), while the rest of the test remains 

 unstained. In optical section the cross-:,triations are seen to correspond 

 with the surface dots, which are, in fact, the ends of \he cylindrical or rather 

 double-cone-shaped structures of dense nature traversing a less dense 

 non-staining matrix (PL 9. fig. 1 a). 



Many young minute individuals were observed, identical with the large 

 forms except that the nucleus contained one central chromatin body 

 surrounded by a clear zone. 



Nebela barbata, Le'idy. (Plate 9. figs. 3 & 4.) 



Leidy, in Proc. Aead. Nat. Sci Philad. 187G, p. 119. 

 Leidy, ' Fresliw. Rhizop. N. America,' 1879, p. 159. 

 West, G. S., Journ. Linn. Soc, Zool. xxviii. (1901) p. 323. 

 Compare Cash, ' Brit. Rbizop. and Ileliozoa,' vol. ii. 1909, p. 113. 



Leidy first descriljed this species from examples taken from sphagnum in 

 N. America, and although it possesses very definite characters, it has since 

 frequently been confused with other species, and it is probable that very few 

 naturalists have really seen it. 



Dr. Penard, in ' Faune Phizop.' p. 3G3, regarding the " cilia" or spicules 

 of Leidy's description as prolably })arasitic growths, considers N. harhata 

 as identical with Taranek's N. americana and discards Leidy's name as less 

 suitable. Cash again (p. 113), both in his description and figures (pi. 27. 

 figs. 5 & 6), confuses N. harhata with quite another form, which probably 

 is to be identified with N. tnhulata, Brown, but he gives also, as a text-figure, - 

 a drawing by West, which correctly shows N. harhata, taken in Llyn 

 Llydaw, N. Wales. N. harhata has been found by the present writer in 

 considerable numbers in Blea Tarn, Westmorland, a small tarn receiving- 

 drainage from sphagnum ; and the individuals quite conform to Leidy's 

 description. 



JS\ harhata has a slightly compressed, flask-shaped test, with a cylindrical 

 neck expanding yery slightly at the mouth. This latter is oval, often 

 with an irregular margin, and never possessing thickened lips or lateral 

 notches. The test is transparent and generally covered with circular discs, 

 sometimes slightly overlapping each other, with occasionally a few irr(^gular 

 flakes or sand-grains. The fine needle-like spicules are rigid and sharp- 

 pointed, about 12 yu, long, and project from between the plates. They occur 

 scattered in large numbers on all sides of the test (/. e. they are not restricted 

 to the lateral margins, as in many species of Phizopod). These cils bear no 



