430 ''■ " FULI.ARTON, 



iü T. kefersteini, small bodies carried iu a stream brought about by 

 the action of cilia clothing the inner surface of the body wall, and 

 he called these "Lyn)i)hkörperchen oder Samenkörperchen". He al8o 

 observed ripe eggs, and "Keimzelll)allen" in females. In T. esch- 

 scholtzia an ovary and eggs are figured. While he did not apparently 

 observe the female genital orifices in his Canary species, he was the 

 first since Leuckart & Pagenstecher's time to see both pairs in his 

 Guinea species, T. rolasi and T. mariana. He describes three pairs 

 of testes iu the three last segments of both these species, but he 

 mistakes for testes the vesicular structures, which Carpenter & Cla- 

 PARÈDE regarded as testes, but which VejdovskV more correctly calls 

 "Samenklumpen". 



The other naturalists, Allman *), Gosse, and Dalyell who have 

 written on Tomopteris do not deal with the generative products, and 

 Claparède -') only met at Naples with a mutilated specimen. 



The sexes are separate. The experience of all observers , who 

 have distinguished the sexes, is the same as mine, viz., that a much 

 larger number of females than males is obtainable by means of the 

 tow-net, in most cases five or six to each male. The younger forms 

 are oftener met with than the adults. In the adults or individuals 

 with a long caudal prolongation of the body, the sexes are easily 

 distinguishable by the large ovarian cells, Fig. 10 ov., in the body 

 cavity on the one hand, and by the round vesicles — "Samenklumpen" 

 — Fig. 5 V. s., on the other. In the young or tail-less forms, the sex 

 is often difficult to determine, as the ovarian and spermatic tissues 

 are much alike in appearance. Both sexes are met with at all seasons 

 of the year, and the adult females seem always to have generative 

 products free in the coelom during the warm months of the year. 



Male generative organs. Neither Eschscholtz, nor Quo y 

 & Gaimard distinguished males, unless the "kleine Körperchen" of 

 the former seen in the body-cavity and its continuations into the 

 lateral appendages refer, as is very improbable, to male cells It is 

 much likelier that the reference is to female genital cells which are 

 larger, and therefore more easily perceived. Busch did not find any 

 males, but it is possible that some in which he did not find eggs, 

 but only "Blutkörperchen" (?), were males, and that his blood-cor- 



1) Allman, On some recent results with the towing net on the 

 south coast of Ireland, in: Nature, 1873, V. 0, p. 74. 



2) Clapakède, Annélides chétopodes du Golfe de Naples, in : Mém. 

 Soc. Phys. et Hist. Nat Genève, V. 10, 1808, p. 561). 



