g4 MR. J. M. BROWN ON SOME NEW AND 



This is, indeed, the superficial appearance. When, however, the plates are 

 examined with great care, it is seen that they are not, in fact, hexagonal. 

 They are, in reality, more or less strongly bent, elliptical plates, with long 

 axis lying transversely, and the iipper and lower edges forming almost 

 straight lines. They are overlapped slightly by the very strongly bent oval 

 lateral plates, which cover the margin of the test. The result is the 

 appearance of hexagons. 



The mouth margins are without covering plates and are very flexible, often 

 becoming folded back during manipulation. 



The test is much broader in proportion than that of S. lenta. 



Size : length 27 /x, breadth 20 /x. 



Amphitrema wrightianUxAI, Archer. 



Archer, in Quart. Journ. Micro. Soc. n. s. ix. 1869. 

 Penard, ' Faune rliizopodique ' SiC. p. 539. 



This species occurred in several collections of sphagnum made in Scotland 

 in August and September 1910, e. g. Stranraer (Wigtownshire), Ben Ledi 

 (Perthshire), generally associated with A. steiwstoma, Niisslin, which seems 

 the commoner species. Dr. Penard found it abundantly in the Jura, but 

 states that until that time it liad never been met with since Archer first 

 described it from Ireland. It does not, however, appear to be at all 

 imcommon in Scotland. 



Literature. 



1869. Archer, W. — "On some Freshwater Phizopoda," in Quart. Journ. 



Micro. Sci. n. s. ix. pp. 38G-397, pi. 1^:). figs. 4-5, ct pi. 20. 

 1910. Brow^n, J. M.—" Freshwater Phizopods from the English Lake 



District," in Journ. Linn. Soc, Zool. vol. xxx. pp. 360-3G3, 



pi. 50. 

 1911. — Brown, J. M. — " A Contribution to our Knowledge of ihQ Freshwater 



Rhizopoda and Heliozoa of Scotland/' in Ann. Scot. Nat. Hist. 



1911, pp. 226-232. 

 1909. Cash, J., and J. Hopkinson. — The British Freshwater Phizopoda and 



Heliozoa. Vol. ii. Ray Soc. 

 1879. Leidy, J.— The Freshwater Rhizopods of North America. (Rep. U.S. 



Geol. Surv. Territ. xii.) Washino-ton. 

 1890. Penard, E.— " Etudes sur les Rhizopodes d'eau douce," in Mem. Soc. 



phys. et hist. nat. Geneve, xxxi. no. 2. 



1902. Faune rhizopodique du bassin du Leman. Geneve. 



1905-6. "Notes sur quelques Sarcodines," in Revue Suisse de Zool. 



xiii. pp. 585-616, pis. 13, 14; xiv. pp. 109-141, pi. 4. 

 1909. - — " Sur quelques Rhizopodes des Mousses," in Arch, fiir 



Protistenk. xvii. pp. 258-296 



