DOG rnocEEDixas OF Tin-: NATIONAL MI-SKI- M. vouxxu 



The following are unfigured Mutelas: 



Mutela lavigerina BOURGUIGNAT, Un. and Ir., 1886, p. 26. Lake Tanganyika. 

 *Mutela moincll BOURGUIGXAT, Un. et Ir., 1886, p. 27. Lake Tanganyika. 



Mutela suMiapliana BOURGUIGXAT, Moll. Fluv. Ny., 1883, p. 5. Victoria N; an/a. 

 *Mutel\na thottoni ROCHEBRUXE, Bull. Soc. Mai. Fr., III. 1886, p. 7. Kongo. 

 *Muielina legumen ROCHEBRUNE, Bull. Soc. Mai. Fr., Ill, 1886, p. 6. Kongo. 

 "Muielina mabilll ROCHEBRUNE, Bull. Soc. Mai. Fr., Ill, 1886, p. 7. Kongo. 

 *Mutelina paludicola ROCHEBRUXE, Bull. Soc. Mai. Fr., Ill, 1886, p. 8. 

 *Mutelina pras'ma ROCHEBRUNK, Bull. Soc. Mai. Fr., Ill, 1886, p. 7. Kongo. 



* Iridina welwitsclni MORELET, Voy. de Angola, 1868, p. 98. 



Genus CHELIDONOPSIS Ancey, 1887. 

 (Type, Chelidoneura arietina Rochebruno. ) 



Chelidoneura ROCHEBRUNE, S. B. Nat. Fr., 1886, p. 3. 

 Chelidonopsis ANCEY, Conch. Exchange, II, 1887, p. 22. 



Shell elongated, thin, narrowed in front, gaping on the anterior basal 

 part and winged on the front dorsal portion, rounded behind, with a 

 pinched-up posterior ridge which develops into an open or closed tube 

 near its hinder part; the shell ending in a diamond-shaped gap; 

 epidermis shining slightly, concentrically grooved ; hinge-line narrow, 

 straight, with faint vestiges of denticles; a deep furrow inside marks 

 the position of the posterior ridge; muscle scars faint; nacre brilliant, 

 iridescent. 



Animal unknown. 



CHELIDONOPSIS ARIETINA Rochebrune. 



* Clielidoneiira arietina ROCHEBRUNE, Bull. Soc. Mai. Fr., Ill, 1886, p. 4, pi. i, figs. 



1-4. 



Gancini, Kongo. 



t CHELIDONOPSIS HIRUNDO von Martens. 



* Spatha hlrundo VON MARTENS, S. B. Nat. Fr., 1881, p. 122; *Conch.Mitth., Ill, 



1885?, p. 139, pi. xxvn; > Conch. Mitth., II. 1883, p. 139, pi. xxvn. 



* Spatha (Mutela ) hirundo ROCHEBRUNE, Bull. Soc. Mai., Fr., Ill, 1886, p. 2, pi. i, 



figs. 5, 6. 

 Chelidoncnra Mr undo VON MARTENS, S. B. Nat. Fr., 1886, p. 161, pi. i, figs. 5, 6. 



Kongo region. 



Genus BRAZZ^EA Bourguignat, 1885. 



(Type, Brazza'a anceyi Bourguignat. -) 

 Brazzata BOURGUIGNAT, Esp. NO.UV. et Gen Nouv., 1885, p. 321. 



Shell thin, transparent, brilliant wine-colored, elliptical, greatly 

 inflated, with a slight post-dorsal wing, and a high double posterior 

 ridge; beaks smooth, compressed, but the region below them full; 



1 Probably the young of arietina. 



2 This appears to be a valid genus, belonging to the Mutellda'. I copy for the most 

 part Bourguignat's description, which leaves out sonic essential characters. I have 

 never seen any of the species. 



