438 Bulletin American M useum of Natural History [Vol. LIII 
Mutela (Chelidonopsis) hirundo (i. v. Martens) 
Plate XLIII, Figures 1, la, 2 
Spatha (Mutela) hirundo E. v. Martens, 1881, Sitz. Ber. Ges. Naturf. Fr. Berlin, 
p. 122; 1882, Jahrb. Deutsch. Malakoz. Ges., IX, p. 248; 1883, ‘Conchol. Mitth.,’ 
II, 3-4, p. 139, Pl. xxvu, figs. 1-3. 
— Chelidonura hirundo E. v. Martens. A. T. p—E RocHEBRUNE, 1886, Bull. Soc. 
Malacol. France, ITI, Pl. 1, figs. 5-6. 
Chelidonopsis hirundo E. v. Martens. Simpson, 1900, Proc. U.S. Nat. Mus., 
XXII, p. 906. Germain, 1913, Bull. Mus. Hist. Nat. Paris, p. 294. DauTzENBERG 
AND Germain, 1914, Rev. Zool. Afric., IV, 1, p.69. Stmmpson, 1914, ‘Descript. Cat. of 
Naiades,’ p. 1368. 
Chelidonura arietina A. T. pp RocHEBRUNE, 1886, Bull. Soc. Malacol. France, 
III, p. 4, Pl. 1, figs. 1-4 (type locality: in the Congo River at Ngancini, French Congo). 
Chelidonopsis arietina A. T. de Rochebrune. Simpson, 1900, Proc. U. 8. Nat. 
Mus., XXII, p. 906. Germatn, 1908, Bull. Mus. Hist. Nat. Paris, pp. 160 and 162, 
fic. 32; 1909, Arch. Zool. Expér. Gén., XLI, pp. 4-34, figs. 2, 3, 5, 8-13, 15, 17-19, 
and 22-24. C. R. Ba@rrcer, 1913, Ann. Soc. Zool. Malacol. Belgique, XLVII, 
(1912), p. 112. Simpson, 1914, ‘ Descript. Cat. of Naiades,’ p. 1368. 
Kwango River near Matjambo, in 6° 8. and 17° E. (type locality; v. Mechow 
Coll.). Brazzaville in the Stanley Pool (Roubaud Coll.). Lualaba River at Kiabwa! 
(about midway between Kikondja and Ankoro; J. Bequaert Coll.). -Zongo on the 
lower Ubangi (Poutrin Coll.). 
Stanleyvile (H. Lang Coll.). | 
Chelidonura arietina was said to differ from hirundo by the slightly 
greater height, the fuller outline in the posterior-basal region, and the 
more diverging posterior carine. However, in immature specimens 
before us of the length of the type of, hzrundo, the divergence of the keels 
is not greater than in that species; the height to length ratio usually 
remains a little greater than in hirundo, but the narrowest individuals 
are about the same. We are in agreement with Germain that artetina 
was based upon old specimens of hzrundo. 
The color is naples yellow to olive lake, shading into deep grayish 
olive or green toward the beaks, having faint, narrow green or dusky 
rays, and dark green at the ends. Some old shells are rich prout’s brown, 
shading upward into greenish olive, the carina and its Be booted 
blackish green. The light blue to biota interior is splendidly iridescent, 
Length, 121.0 mm.; height, 40.0 mm.; diameter in the middle, 26.0 mm. 
fe 121.0 hie 8 ie i io 25.0 
iy 100.00. i eee a st ‘i 14.5 
Other Species of Chelidonopsis Recorded from the Belgian Congo 
| Mutela (Chelidonopsis) carret (Putzeys) 
Burtonia carret Putznys, 1898, — Soc. Malacol. Belgique, XX XIII, Bull. 
Séances, p. xxviii, fig. 16. 
1Misspelled Kibawa by Dautzenberg and Germain. 
