1927] Pulsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 155 
Length, 2.4 mm.; width, 1.75 mm.; height, 0.9 mm. 
The symmetrical basal Jui and the position and form of the 
apex distinguish this species, which has been examined by Bryant Walker 
and pronounced distinct. It is named in his honor. 
Other Species of Burnupia Recorded from the Belgian Congo 
Burnupia trapezoidea (O. Beettger) 
Ancylus trapezoideus O. BaarrcEr, 1907, in Schulze, ‘Aus Namaland und Kala- 
hari,’ p. 708 (without description); 1910, Abh. Soriokionbees: Naturf. Ges., XX XII, 
p. 450, Pl. xxvit1, figs. 15a-b (type locality: subfossil at Witkop, British ie ceitiscmlenid): 
Ancylus (Burnupia) trapezoideus O. Boettger. B. WaLKER, 1912, The Nautilus, 
XXV, p. 141. Connotuy, 1912, Ann. South African Mus. APS ore 
Ancylus caffer AC rlasitin E. v. Martens, 1897, Doibon Ost Afr., IV, Be- 
schalte Weichth.,’ p. 151, Pl. 1, figs. 19a-d. 
Burnupia bates (O. Boettger) B. WALKER, 1924, Espanta of South Africa,’ 
p. 57, Pk. 1, figs. 16 end-17, } 
B. Waller refers to this South African species the specimens from Undussuma in 
the Tararo brook (Stuhlmann Coll.) which E. v. Martens recorded as A. caffer, but 
he does not appear to have seen them. 
Pseudancyline Walker 
Shell capuliform; apex posterior, slightly turned to the right, surface coarsely, 
radiately striate. 
Animal sinistral. Radula having the teeth arranged in horizontal rows, with a 
narrow, unicuspid central tooth, the base slightly wider and rounded below; the 
laterals and marginals with long, narrow bases in close juxtaposition; endocones 
lacking; the laterals with a long unicuspid mesocone and a small ectocone; the laterals 
gradually pass into the marginals, the cusp of the mesocone diminishing in size toward 
the margin, and two cusps are developed representing the ectocone on the marginals. 
The jaw is described by Moquin-Tandon and Lehmann as composed of a central fixed 
portion and two movable side parts, but Gwatkin states that the jaw is “segmented 
in plates like that of Punctum pygmexum.”’ 
PsEUDANCYLUS Walker 
Ancylus of authors generally, but not of O. F. Miller as limited by Children’s 
type selection. , 
Pseudancylus B. WALKER, 1921, The Nautilus, XXXV, p. 58. Type by aoainel 
designation: Ancylus fluviatilis O. F. Miller. 
Shell without spiral apical whorls; other characters those of the subfamily. 
The following two Abyssinian species apparently are true Pseud- 
ancylus: 
Pseudancylus abyssinicus (Jickeli) = Ancylus (Ancylastrum) abyssinicus JICKELI, 
1874, Nova Acta Ac. Nat. Cur. Dresden, XX XVII, 1, p. 223, Pi. 111, figs. 5-6, and PI. 
vil, figs. 27-28. From various localities in Eritrea: on the road between Ghinda and 
Asmara; near Mekerka on the Toquor River; affluents of the Anseba River; Zazega. 
