DIFFLUGIA UKCEOLATA. 43 



single stone flake of greater width than the spine at 

 its point of attachment. 



17. Biffing ia amphoralis sp. nov.* 

 (Plate XXI, fig. 13.) 



Difflugia amphora LEIDY (pars) in Pr. Acad. Philad. 1874, 

 p. 79 ; LAGEEHEIM ? in Fork Geol. Foren. Stockholm, 

 XXIII (1891), p. 509; AVERINTZEV (pars) in Trudui 

 S.-Peterb. Obshch. XXXVI (1906), 2, p. 184; SCHOU- 

 TEDEN in Ann. Biol. Lacustre, I, 3 (1906), pp. 341, 345, f. 

 15; SCHNEIDER? in Arch. Biontol. II, 1 (1908), p. 58. 



Difflugia ureeolata LEIDY (pars) Freshvv. Rhiz. N. Amer. 

 (1879), p. 106, t. xiv, f. 8 ? ; t. xvi, f. 33. 



Difflugia ureeolata var. amphora LEIDY (pars), Fresh w. 

 Khiz. N. Amer. (1879), t. xvi, f. 34. 



(Non Difflugia amphora EHRENBERG in Abli. Akad. Wiss. 



' Berlin, 1871 (1872), p. 248.) 



Smaller than Difflugia ureeolata, and differing from 

 it in having the crown neither convex nor spined, but 

 pointed like a Gothic arch ; the mouth with an ex- 

 panded but not upturned run below the constricted 

 neck. The test composed of chitinous material, sur- 

 faced with amorphous (? siliceous) scales, but few 

 sand-grains ; semitransparent. The plasma-body not 

 connected with the sides but attached to the fundus 

 by threads of ectoplasm. Nucleus single ; pseudo- 

 podia numerous, simple or digitate. 



Dimensions: Length about 115 /A; greatest width 

 70 /A ; width at constriction of neck 40 /A. 



In marshy places amongst Sphagnum, near Criccieth, 

 Carnarvonshire, August, 1904. 



Difflugia amphoralis is distinct from I), amphora 

 Penard. In the latter (not observed in Britain) the 

 mouth has a peculiar chitinous rim with a wavy and 

 sharply-cut outline. 



[Differing from Difflugia ureeolata in having only a 

 single nucleus, as well as in the nature of the test and 



* [Difflugia ureeolata var. amphora var. nov. : CASH, MS.] 



