50 BULLETIN 81^ UNITED STATES NATIONAL MUSEUM. 



Tubicolaria fraxinina (Muller). 



Vorticella fraxinina Muller, Anim. Infus., 1786, p. 276, pi. 38, fig. 17; not a rotifer. 



Tubicolaria fraxinina Lamarck, Hist. Nat. Anim. eans Vert., vol. 2, 1816, p. 53. 

 Tubicolaria limacina (Muller). 



Vorticella limacina Muller, Anim, Infus., 1786, p. 275, pi. 38, fig. 16; not a rotifer. 



Tubicolaria limacina Lamarck, Hist. Nat. Anim. sans Vert., vol. 2, 1816, p. 53. 

 Tubicolaria thorii Bory de St. Vincent, Enc. M^tli., Zooph. (pt. 2), 1827, p. 755. 

 Tubicolaria tuba Costa, Fauna Regno Napoli, Infusori, 1838, p. 20, pi. 2, fig. 11; not 

 a rotifer. 



FURCOCERCA Lamarck. 



Furcocerca Lamarck, Hist. Nat. Anim. sans Vert., vol. 1, 1815, p. 443, to Gastrotricha. 

 Type (by present designation). — Furcocerca podura (Muller) =Cercana podura Miiller. 



Furcocerca podura (Muller). 



Cercaria podura Muller, Verm. Terr. Fluv., vol. 1, pt. 1, 1773, p. 66. 

 Furcocerca podura Lamarck, Hist. Nat. Anim. sans Vert., vol. 1, 1815, p. 448. 



FURCULARIA Lamarck. 



Furcularia Lamarck, Hist. Nat. Anim. sans Vert., vol. 2, 1816, p. 39. Type (by 

 present designation). — Rotaria rotatoria (Pallas) as Furcularia rediviva (Cuvier). 



Ehrenberg (Infusionsth., 1838) rather disingenuously informs us 

 that the species of Lamarck's genus Furcularia have been distributed 

 among other genera, so that not a single one remains. This did not 

 prevent him from describing several new species with the generic 

 name Furcularia, in accordance with his peculiar understanding of 

 a nomen vacuum. It appears from what he says under Megalo- 

 trocha, in Symb. Phys. Anim. Evert., that, in his opinion, when all 

 the species had been removed from a genus, its name became a 

 nomen vacuum, and could be used again for any animal in need of 

 a name. 



According to Ehrenberg, "Cuvier und Schweigger sahen Rotifer 

 als den Typus der Furcularien an." This, added to the fact that 

 Lamarck in 1801 had established a monotypic genus, Urceolaria, 

 for Rotifer redivivus Cuvier, seemed abundant justification for the 

 designation of the type as above. It should be noted that Rotifer 

 Cuvier also was a monotypic genus. The species listed here are 

 insufficiently described, and no position can be assigned to them 

 on the information available. 



Furcularia boltoni Gosse, Hudson and Goese, Rotifera, 1886, vol. 2, p. 45, pi. 20, fig. 2. 

 Furcularia canicula (Mxjller). 



Vorticella canicula Muller, Anim. Infus., 1786, p. 300, pi. 42, fig. 21. 



Furcularia canicula Lamarck, Hist. Nat. Anim. sans Vert., vol. 2, 1816, p. 39. 

 Furcularia catulus (Muller). 



Vorticella catulus Muller, Verm. Terr. Fluv., vol. 1, pt. 1, 1773, p. 108. 



Furcularia catulus Lamarck, Hist. Nat. Anim. sans Vert., vol. 2, 1816, p. 39. 

 Furcularia lophyra Gosse, Journ. Royal Micr. Soc, 1887, p. 4, pi. 2, fig. 13. 

 Furcularia molaris Gosse, Journ. Royal Micr. Soc, 1887, p. 863, pi. 14, fig. 6. 



