THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SIXTH SERIES.] 



" per litora spargite museum, 



Naiades, et circfim vitreos considite fontes : 

 Pollice virgineo teneros hie carpite flores : 

 Floribus et pietum, divse, replete canistrum. 

 At vos, o Nymphse Craterides, ite sub undas ; 

 Ite, recurvato variata corallia truneo 

 Vellite muscosis e rupibus, et mihi conchas 

 Perte, Dese pelagi, et pingui conchylia suceo." 



N.PartheniiGiannettasii Kol. 1. 



No. 25. JANUARY 1890. 



I. — Some Remarks on the Anatomy of Stephanoceros 

 Eichhornii. By Rupert Vallentint. 



[Plates I. & II.] 



Notwithstanding the fact that this Rotifer has been known 

 to exist for nearly one hundred and thirty years, forming as 

 it unquestionably does one of the most interesting objects for 

 microscopical exhibition, still much remains to be learnt 

 concerning its anatomy. 



Having recently secured some very large specimens, I 

 naturally consulted the last monograph (1) * with which I am 

 acquainted, and was astonished to find how great were the 

 differences of opinion concerning the most fundamental points 

 of its anatomy. It then occurred to me to try if some of 

 these points could not be determined by means of serial sec- 

 tions, since all other means had failed ; and my results, 

 although good, still leave considerable room for improvement. 



I assume on the part of the reader a slight acquaintance 

 with the anatomy of the animal, such as may be obtained 

 from any text-book, and so will proceed to discuss those 

 results which my work has so far yielded. 



* The numbers refer to Bibliographical List at end. 

 Ann. & Mag, N. Hist. Ser. 6. Vol. v. 1 



