HYALOSPilENIA SUBFLAVA. 89 



ovoid, approximating in form to the Lancashire speci- 

 mens. In no case were the corners, at the mouth, 

 sharply angled. 



7. Hyalosphenia elegans Leidy. 



(Plate XXIV, figs. 12-14; Plate XXXI, figs. 13 and 

 14 ; and figs. 81 and 82 in text.) 



Difflugia (Catharia) elegans LEIDY in Pr. Acad. Philad. 

 1874, p. 156 ; and op. cit. 1875, p. 415. 



Hyalosphenia elegans LEIDY in Pr. Acad. Philad. 1875, p'. 

 415 ; op. cit,. 1879, p. 163 ; and Fresliw. Rhiz. N. Amer. 

 (1879), p. 140, t. xx, ff. 19-29; HITCHCOCK Synops. 

 Freshw. Rhiz. (1881), p. 19; TARANEK in Sitzber. bohm. 

 Akad. Wiss. 1881 (1882), p. 229; BLOCHMANN Mikr. 

 Thierw. Susswass. (1886), p. 12; and ed. 2 (1895), p. 15; 

 GREEFF in Sitzber. Ges. Nat. Marburg, 1888, 3, p. 112; 

 HARVEY in Amer. Natur. XXII (1888), p. 73 ; PENARD 

 in Mem. Soc. Geneve, XXXI (1890), 2, p. 165, t. vii, ff. 

 36-39 ; and Faune Rhiz. Leman (1902), p. 339, ff. 1-3 

 (p. 340) ; PEERY in Pr. Amer. Soc. Micr. XII (1891), p. 

 95; ENTZ in Res. vviss. Erforsh. Balatcms. (1897), II, 1, 

 p'. xxiv ; DADAY in Termesz. Fiizetek, XXI (1898), Suppl. 

 pp. 5, 9 ; CASH in Tr. Manch. Micr. Soc. 1891 (1892), p. 49, 

 t. ii, ff. 10, 11 ; AVERINTZEV in Trudui S.-Peterb. Obshch. 

 XXX, 1 (1900), p. 239; op. cit. XXXVI (1906), 2, p. 

 227 ; and in Ber. Susswass. Nat. Ges. St. Petersb. I (1901), 

 p. 211; LAGERHEIM in Forh. Geol. Foren. Stockholm, 

 XXIII (1901), p. 514; LEVANDER in Acta Soc. Fauna 

 Fenn. XVIII (1900), 6, p. 77 etc. ; and op. cit. XX (190]), 

 8, p. 9 ; G. S. WEST in Jrn. Linn. Soc., Zool. XXVIII 

 (1901), p. 325; and in Ann. Scott. Nat. Hist. 1905, p. 

 90; SCHOUTEDEN in Ann. Biol. Lacustre, I, 3 (1906), 

 pp. 351, 352, f. 23; HOOGENRAAD in Tvdschr. Nederl. 

 Dierk. Ver. (2) X (1908), p. 409. 



Hyalosphenia turfacea TARANEK ? in Sitzber. bohm. Ges. 

 Wiss. 1881 (1882), p. 229. 



Test of colourless or pale-yellowish chitinous mem- 

 brane ; in broad view flask-shaped, ovoid, or pyriform 

 with a cylindroid neck, slightly convex at the mouth ; 

 in lateral view narrowly elliptic, the sides tapering 

 downwards to the mouth, which is deeply notched. 

 Elliptic in transverse section. Surface of the test 



