SYNOPSIS OF THE ROTATORIA. 69 



Lacinularia flosculosa Schweigger, Handb. Naturg., 1820, p. 408. 



Slentorina biloba Bory de St. Vincent, part. Class. Aniin. Micr., 1826, p. 67. 



Stcntorina rceselii Bory de St. Vincent, part. Class. Anim. Micr., 1826, p. 67. 



Megalotrocha sodalis Bory de St. Vincent, Class. Anim. Micr., 1826, p. 76. Type 

 (monotype) of genus Megalotrocha Bory de St. Vincent, 1826= Vorticella flos- 

 culosa renamed. 



Lacinularia sodalis Ehrenberg, Abh. Akad. Wiss. Berlin, 1830, p. 45. 



Lacinularia fluviatilis Carus, Erlaut.-Tafeln z. vergleich. Anat., Heft 3, 1831, p. 7, 

 pi. 1, fig. 1-9. 



Two quite closely related animals, for which Ehrenberg in his 

 Infusionsthierchen (1838) used the names Lacinularia sodalis and 

 Megalotrocha albojlavicans, have been confused since the tenth 

 edition of Linnseus's Systema naturse (1758). They were described 

 by Rosel in vol. 3 of his Insecten-Belustigung, published about 1755. 

 He considered them one species, for which he used the name "Der 

 gesellige keulenformige Afterpolyp," and gave a lengthy description 

 of it, pp. 585-595, with figures on plates 94-96. Plate 94, figures 1-6, 

 is Ehrenberg's Lacinularia sodalis; plate 94, figures 7 and 8, is a 

 Stentor of some sort; plate 95, figures 1-5, may be either Lacinularia 

 or Megalotrocha; plate 96, figures 1-4, is easily recognizable as 

 Ehrenberg's Megalotrocha albojlavicans, having the eggs attached to 

 the body in a cluster. Lmnseus followed Rosel, probably without 

 having seen the animals himself, citing under Hydra sodalis: Rosel, 

 Ins., vol. 3, p. 584, plate 94, figure 4; plates 95, 96, and under Hydra 

 stentoria: Rosel, Ins., vol. 3, p. 594, plate 94, figures 5, 6, 7, 8. It 

 will be seen fi'om this that Hydra sodalis is Lacinularia + Megalo- 

 trocha, and Hydra stentoria is Lacinularia + Stentor. PaUas's de- 

 scription is quite evidently from Lacinularia sodalis of Ehrenberg, 

 but he did not divide the species nomenclatorially. Miiller, in Verm. 

 Terr. Flu v. (1773), used two names, Vorticella sodalis and Vorticella 

 flosculosa. From the descriptions and figures m his Animalcula 

 infusoria (1786) it is seen that Vorticella sodalis is the egg-carrying 

 species, Ehrenberg's Megalotrocha albojlavicans, and Vorticella Jlos- 

 culosa the more slender-footed, jelly-encased form, Ehrenberg's 

 Lacinularia sodalis. Consequently, Lacinularia must take the 

 specific name Jlosculosa (Miiller), and the second species becomes 

 sodalis (Linnaeus) taking the generic name Sinantherina Bory de 

 St. Vincent. This has page precedence over Megalotrocha, the prin- 

 cipal reason for preferring the former being, however, that if Megalo- 

 trocha had been accepted, with the type (monotype) Vorticella 

 flosculosa MiiUer (this being given by Bory de St. Vincent as synonym 

 for his Megalotrocha sodalis) we would have been forced to use the 

 name Megalotrocha Jlosculosa (Miiller) for Ehrenberg's Lacinularia 

 sodalis and Lacinularia sodalis (Linnseus) for Megalotrocha albo- 

 flavicans of Ehrenberg, thus completely reversing the meaning of 

 the combination Lacinularia sodalis. 



