20 



cell ; it occupies a position near the bottom of the cell, and is 

 thus separated by a wide interval from the ovary. Like the lat- 

 ter organ, it is connected with the stomach by a cylindrical 

 cord precisely similar to that already described as belonging 

 to the ovary. This cord, which is connected with the testicle 

 by one extremity, is attached by the other to the fundus of the 

 stomach, and its office is just as obscure as that of the corres- 

 ponding cord connected with the ovary. The testicle was 

 observed at the same time as the ovary, and was then loaded 

 with spermatozoa, which projected from its surface in the form 

 of a dense villosity, each minute filament of which exhibited a 

 perpetually undulating motion. Many of the spermatozoa had 

 escaped from the testicle and were carried about by the cur- 

 rents of the perigastric fluid, and thus brought in contact with 

 the ovary, round which several were observed clustering. The 

 spermatozoa in Paludicella are simple vibrioid bodies without 

 any terminal enlargement, and exhibit a constant sinuous or un- 

 dulatory motion. 



" The ova, on arriving at a certain stage of development, 

 and while still in the ovary, present distinctly the germinal 

 vesicle and germinal speck ; these, however, soon disappear. 

 When the ovum escapes from the ovary it is a lenticular body, 

 surrounded by an annulus, in which a somewhat obscurely 

 cellular structure is apparent. A coloured and very eccentric 

 spot may be observed at this stage in the contents of the ovum. 

 I have not been fortunate enough to observe the ova of Palu- 

 dicella more than once, and have thus had no opportunities of 

 making further observations on these bodies. 



" I have never witnessed in Paludicella the occurrence of 

 free locomotive embryos, such as may be seen in other poly- 

 zoa, though it is by no means improbable that further research 

 may detect them; I have, however, succeeded in following 

 the development of the gemmae from a very early stage to its 

 completion. The gemma, in the earliest condition in which I 



