- 1927} Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 437 
Cailliaud’s figures. The nacre is pale pink, with vinaceous-brown stains, 
or brownish vinaceous throughout. In typical nilotica the Hoept is 
about equal at beaks and at posterior third. 
Length, 145 mm.; height, 59 mm.; diameter, 42 mm. 
Mutela nilotica var. moineti (Bourguignat) 
Mutela moinett BourcuiGNat, 1886, ‘Nouv. Malacol., I, Un. et Irid. Tanganika,’ 
p. 27. Germain, 1911, ‘Doc. Scientif. Miss. Tilho,’ II, p. 211, footnote, Pl. 111, fig. 1. 
Mutela joubertt Bourcuiaenat, 1886, ‘Nouv. Malacol., I, Un. et Irid. Tanganika,’ 
p. 28; 1888, “‘Iconogr. Malacol. Tanganika,’ Pl. xx111, fig. 1. 
Mutela vissert BouRGUIGNAT, 1886, ‘Nouv. Malacol., I, Un. et Irid. Tanganika,’ 
Heo. 
Mutela vysseri Boureutenat, 1888, ‘Iconogr. Malacol. Tanganika,’ Pl. xx111, 
figs. 2-3. 
Lake Tanganyika: Pambete (type locality of M. moineti according to Germain). 
The subordination of this to nilotica appears doubtful. 
Mutela soleniformis Bourguignat 
Mutela soleniformis BourGcuIGNat, ‘Esp. Nouv. Ouk. Tanganika,’ p. 25; 1888, 
‘Iconogr. Malacol. Tanganika,’ Pl. xx11, figs.2and3. E.v. Martens, 1897, ‘Deutsch 
Ost Afr., IV, Beschalte Weichth.,’ p. 254. PrLSENEER, 1886, Bull. Mus. Hist. Nat. 
Belgique, IV, p. 109. 
Mutela bridouxt BouRGuIGNAT, 1886, ‘Nouv. Malacol., I, Un. et Irid. Tanganika,’ 
p. 25; 1888, ‘Iconogr. Malacol. Tanganika,’ Pl. xx11, fig. 1. 
Lake Tanganyika: shores near Kibanga and in the Burton Gulf. 
é 
Subgenus CHELIDoNopPsis Ancey 
Chelidonura A. T. DE RoCHEBRUNE, 1886, Bull. Soc. Malacol. France, III, p. 3. 
Type by original designation: Spatha hirundo E. v. Martens. Not Chelidonura A. 
Adams, 1850. 
Chelidoneura GERMAIN, 1908, Bull. Mus. Hist. Nat. Paris, p. 160, footnote (mis- 
spelling of Chelidonura, as a synonym of Chelidonopsis). 
Chelidonopsis ANCEY, 1887, Conchol. Exchange, II, p. 22. Subsituite for Cheli- 
donura A. 'T. de Rochebrune; same type. 
This group is restricted to the Congo basin. Two forms have been 
described: 
Mutela (Chelidonopsis) carrei (Putzeys). See p. 438. 
Mutela (Chelidonopsis) hirundo (E.v. Martens). See p. 488. 
Key to Species of Chelidonopsis 
1. Carine of the posterior ridges conspicuously expanded and diverging at their 
posterior ends. Height slightly exceeding one-fourth of the length in adult 
shells, slightly less than one-fourth in young specimens. 
M. hirundo (E. v. Martens). 
Posterior ridge carinate, but the carine do not expand and diverge wing-like 
at ‘them temmamatione foe ie ee case cobain 6 ch a ee M. carrei (Putzeys). 
