NO. 2164. REVISION OF ROTATORIAN GENERA— HARKING. 531 



For collections from St. Paul Island, Alaska, to Dr. G. H. Parker, 

 of Harvard University, Cambric' '^;e, Massachusetts. 



For collections from the neighborhood of Stockton, California, to 

 Mr. W. E. Allen, of Stockton. 



It is a great pleasure to express my gratitude to these gentlemen, as 

 any value which this work may have is principally due to their kind 

 assistance ; with only local material for study, the writer would have 

 been no better off than earlier investigators working also on collec- 

 tions from a limited territory and would no doubt have encountered 

 the same pitfalls. 



The species listed below have been omitted from the specific de- 

 scriptions, as they are unknown to the writer. Some appear to be 

 insufficiently described for identification and others were probably 

 incorrectly referred to the genera which form the subject of this paper. 



Lepadella mucronata Schmarda, Neue wirbell. Thiere, vol. 1, pt. 1, 1859, p. 57, pi. 



13, fig. 120. 

 Lepadella setifera Schmarda, Neue wirbell. Thiere, vol. 1, pt. 1, 1859, p. 58, pi. 13, 



fig. 121. 

 Lepadella vitrea (Shephard). 



Metopidia ovalis Anderson and Shephard, Proc. Royal Soc. Victoria, n. ser., 



vol. 4, 1892, p. 78, pi. 12, fig. 6. 

 Metopidia vitrea Shephard, Proc. Royal Soc. Victoria, n. ser., vol. 24, 1911, p. 55. 

 Lepadella vitrea Harring, Bull. 81 U. S. Nat. Mus., 1913, p. 65. 

 Lophocharis rostrata Eichwald, Bull. Soc. Imp. Nat. Moscou, vol. 22, 1849, pt. 1, p. 



536, pi. 4, fig. 27. 

 Lophocharis triangulum Eichwald, Bull. Soc. Imp. Nat. Moscou, vol. 17, 1844, pt. 2, 



p. 680. 

 Metopidia pygmaea Gosse, Journ. Royal Micr. Soc, 1887, p. 867, pi. 15, fig. 17. — 



Hudson and Gosse, Rotifera, Suppl., 1889, p. 46, pi. 31, fig. 47. 

 Metopidia scutumpes Mola, Zool. Anz.. vol. 42, 1913, p. 124, text fig.; Ann. Biol. 

 Lacustre, vol. 6, 1913, p. 271. 



Genus LEPADELLA Bory de St. Vincent. 



Lepadella Bory de St. Vincent, Class. Anim. Micr., 1826, p. 44. Type (by 

 designation of Harring, Bull. 81 U. S. Nat. Mus.. 1913, p. 63), Lepadella patella 

 (Muller)=5racAio?ms patella Miiller. 



Metopidia Ehrenberg, Abh. Akad. Wiss.. Berlin, 1830, p. 72. Type (mono- 

 type) : Metopidia triptera Ehrenberg. 



The genus Lepadella was proposed by Bory de St. Vincent in his 

 Essai d'une classification des animaux microscopic] ues, 1826, for 

 Bracliionus 'patella Miiller, to which were doubtfully added Trichocla 

 comuta Miiller and Bracliionus lamellans Miiller. When the question 

 of type designation was before the writer, it seemed that Brachionus 

 patella was the logical choice, this being the only species definitely 

 designated as a member of the genus Lepadella, which was accepted 

 by Ehrenberg and Dujardin in substantially the same sense; more- 

 over, Miiller's figure is as good as many of the much more recent picto- 



