PONTIGULASIA. 59 



constriction of the neck situated a little distance above 

 the mouth, and the possession of an internal transverse 

 loop, or diaphragm, extending from side to side co- 

 extensively Avith the constriction, and of the same sub- 

 stance as the test, or adhering all round its sides, and 

 perforated for the emission of the pseudopodia. 



The organism named and figured by Leidy, first as 

 Diffiugia vas, and afterwards as D. pyrifurmis var. vas 

 {Pontigulasia spectnbilis Penard), may be taken as, 

 typical of the genus. It was, in fact, created to receive 

 that particular form, but others have since been added. 



1. Fontigulasia vas (Leidy) Schouteden.* 

 (Plate XXIII, fig. 1 ; and figs. 70 and 71 in text.) 



Difflttgia las Leidy in Proc. Acad. Philad. 1874, p. 15.5; 



and op. cit. 187-5, p. 307 j Cbrtes in Mission scient. Cap. 



Horn, VI (1889), Zool. 3, p. 13; Cash in Tr. Manch. 



Micr. Soc. 1891 (1892), p. 48. 

 Difflitgia pyriformis var. vas Leidy Freshw. Rhiz. N. Amer. 



(1879), pp. 99, 101, t. xii, e. 2-9; Hitchcock Synops. 



Freshw. Biiz. (1881), p. 12; Penard in Mem. Soc. Geneve, 



XXXI (1890), 2, p. 137, t. iii, fE. 39-41; and in Rev. 



Suisse Zool. VII, 1 (1899), t. ii, f. 9; Schaudinn in 



Deiitsch-Ost- Africa, IV, 2 (1897), 19, p. 9 ; Aveeintzbv in 



Ber. Susswass. Nat. Ges. St. Petersb. I (1901), p. 212; 



Lageeheim in Forh. Gaol. Foren. Stockholm, XXIII, 6 



(1901), p. 503; G. S. West in Jrn. Linn. Soc, Zool. 



XXVIII (1901), p. 318; Thiebaud & Favee in Ann. 



Biol. Lacusfcre, I, 1 (1906), pp. 76, 79. 

 Difflugia Tpyriformis Leidy (pars), Freshw. Rhiz. N. Amer. 



(1879), p. 102, t. xix, ff. 24-26. 

 Fontigulasia spectahilis Penaed Faune Rhiz. Leman (1902), 



p. 318, if. 1-9 (p. 319) ; AvERiNTZEV in Trudui S.-Peterb. 



Obshch. XXXVI (1906), 2, p. 167. 

 Pontigtdasva vas Schouteden in Ann. Biol. Lacustre, I, 3 



(1906), p. 338 (note). 



Test in lateral view round or ovoid, not compressed, 

 the constriction deep and well-marked, sometimes forti- 

 fied by comparativelj^ large quartz-grains ; the neck 



* [^Fontigulasia spectabilis Penard : Cash, MS.] 



