250 M. F. d'A. Furtado on Viquesnelia atlantica. 



BIBLIOGRAPHIC INDEX. 



I. O. F. MiiUer, Prodromus Zool. Dan. 1776. 

 II. Schrauk, Fauna Boica, 1803. 



III. Ehrenberg, Die Infusionstliierchen, 1838. 



IV. Ehrenberg, Monatsb. Berl. Akad. 1840. 

 V. Dujardin, Infusoires, 1841. 



VI. Ehrenberg, Monatsb. Berl. Akad. 1844. 

 VII. Claparede et Lachniann, Etudes sur les Infusoires etles Rhizopodes, 



1858. 

 VIII. Steiu, Der Organismus der Infusorieu, 1859-67. 

 IX. Hack el, " Ueber einige pelagische Infusorien," Jenaische Zeitschrift, 

 1873. 



XXII. — On Viquesnelia atlantica, Morelet & Drouet. 

 By Francisco d'Arruda Furtado *. 



[Plate XIII.] 



The history of the genus Viquesnelia is sufficiently well known, 

 but may usefully be repeated here. It was founded by 

 Deshayes, upon some fragmentary Roumelian fossilsf. D' Ar- 

 chiac discovered another fossil representative of the genus in 

 the Pyrenees:!:. The only surviving species known are one 

 native to India [V. Dussumieri^ Fischer §) and a second found 

 in the Azores ; the latter is the subject of the present paper. 



I have not been able to obtain Fischer's memoir on the 

 Indian species ; but the absence of any description of the 

 animal in various conchological manuals, which at the same 

 time make mention of the species, leads me to suppose that 

 the detailed structure of Viquesnelia has not hitherto been 



* Translated, with notes, by Prof. L. C. Miall. 



t [" Note siu- un nouveau genre de Limacien fossile," par M. DesTiayes, 

 Journal de Conchyliologie, 2'^ ser. torn. i. p. 283, pi. tH. figs. 14-17 

 (1856). The fossils in question {V, lenticularis, Desh.) were obtained by 

 M. Viquesnel from rocks believed to be of the age of the Nummulitic 

 Limestone, at Balouk-Keni, near Feredjik, Roumelia. — M.] 



I [In a footnote to the paper cited above, Deshayes remarks that 

 D'Archiac had found a TlquesneMa-stvutura in the lower part of the 

 Nummiditic deposit of the Pyrenees. This is apparently the authority 

 for the statement in the text. — M.] 



§ [" Addition a la Note sur le Genre Viquesnelia,^' Journ. de Conchy- 

 liologie, 2*^ ser. torn. i. p. 290. In this short memorandum Fischer ex- 

 plains that some shells of Limacidae obtained at Mahe by Dussumier are 

 preserved in the Museum at Paris, and that Valenciennes had attached 

 to them a label beai'ing the name Cli/peicella Dussumieri. The species is 

 HOW included in Viqtcesnelia. — M.] 



