On the generative Organs and Products of Tomopferis onisciformis K. 427 



Dombre d'ovules, plus pressés vers l'extrémité du corps où ils étaient 

 comme entassés; quelques-uns occupaient les appendices branchiaux." 



Busch ') saw two kinds of cells in the body-cavity, and called 

 them, respectively, a) "Eier" with "Keimbläschen und Keimfleck", 

 and b) "kleine Küj^elcheu". He described the latter as blood corpuscles, 

 "wahrscheinlich Blutkörperchen", He was the first to perceive what 

 other observers have since noticed, that the latter circulate freely in 

 the body -cavity, and in the lateral prolongations of this cavity into 

 the parapodia, but apparently he had noticed that the ova also are 

 carried around in these streaming movements. Exception might be 

 taken to his "kleine Kügelchen" being in reality blood corpuscles, but 

 this will come up for consideration when I deal with my own obser- 

 vations. 



Grube ^) also describes the eggs, "liegen frei in der Bauchhöhle." 



Leuckakt & Pagenstecher ^) advance the subject a stage further, 

 and state the origin of the egg-cells to be from the inner-wall of the 

 extremities of the lateral appendages. They also tell of a "Kliiftungs- 

 process"' *) taking place before the development into eggs of the cells 

 found in the body cavity, and they were the first to perceive the 

 genital apertures for the passage of the eggs from the animal to the 

 surrounding medium. 



Carpenter ^), who obtained his specimens on the west coast of 

 Scotland, within two or three miles of where I first met with Tomo- 

 pteris^ gives an account by Huxley of examples which he caught in 

 Torres Straits. Huxley deals amongst other matters with the ova 

 seen freely passing from the hollow lateral appendages to the cavity 

 proper of the body. These floating "rounded masses'' or ova were 

 jI^"" of an inch in diameter, the germinal vesicle being -i-'** 

 of an inch, and the germinal spot being j-^— "" of an inch. Huxley 

 saw in another, supposed to be a male, what he took for young 

 spermatozoa, which were — î-r"' of an inch in diameter. 



Carpenter & Claparè:de ") describe eight pairs of "ovoidal bodies" 



1) p. 185. 



2) in: Archiv f. Naturgesch., ut supra, p. 343. 



3) Leuckakt & Pagknsteciiek, Untersuchungen über niedere Seethiere, 

 in: Archiv f. Anat. u. Physiol, Jahrg. 1858, p. 588, tab. 20, fig. 1—8. 



4) p. 5i»2. 



5) Carpentek, On Tomopteris onisciformis Esch., in: Trans. Linn. 

 Soc, London 1859, V. 22, p. 353, tab. 62, fig. 1—9. 



6) Cari'Kntkk a Ci-APARftî)E, Further researches on Tomoi)teris 



28* 



