Mr. H.J. Carter on the Oi^ganization of Infusoria, 225 



reference, they are undoubtedly developed in the neighbourhood 

 of the nucleus, and therefore confined at first to a particular 

 part of the body. 



In many of Ehrenberg's enterodelous Infusoria it is not un- 

 common to see a number of defined globular bodies, of nearly 

 equal size, and of a faint, opake, yellow colour, which closely 

 resemble ovules, — ex. gr. Amphileptus fasciola (Ehr.), Himanto- 

 phorus Charon (Ehr.), &c. ; nor is it improbable that many of his 

 Trachelina, which come near Planaria, possess ovules similar to 

 those which are found in the latter; but, from being so much mixed 

 up with the spherical cells, pass equally unnoticed while in, as well 

 as when out of the body, under such circumstances. M. J. Haime, 

 however, has distinctly seen instances in which these bodies have 

 been ejected from Infusoria, and have passed into locomotive ani- 

 malcules under his eye. Thus he states that in Plcesconia they 

 form a group of from forty to fifty in the middle of the body, are 

 round, issue one by one, remain tranquil some time, then deve- 

 lope two filaments, one in front, the other behind, and move 

 about rapidly. In an " undescribed '^ species of Dileptus they 

 are whitish, and form a wreath, extending almost throughout 

 the whole length of the body, become yellow towards the anal 

 extremity, where they pass out with the remains of the food, 

 soon develope two opposite filaments, and move about rapidly. 

 In Paramecium aurelia, M. Haime states that an ovary appears 

 some hours before death, about the middle of the body, which 

 becomes filled with about sixty little nuclei ; these increase in 

 size, burst the ovisac, and thus pass into the body of the parent, 

 from which they finally escape by an opening in the tegumentary 

 covering, formed by the diffluence of the latter, and the ovisac 

 follows them *. 



Spermatozoids, — This term is provisionally applied to granules 

 which are originally developed from the nucleus in Amoeba^ 

 Euglypha, and Spongilla (?). In Amoeba the process appears to 

 commence by an increase of size in the capsule of the nucleus, 

 which becomes more or less globular ; at the same time the nu- 

 cleus itself becomes uniformly granular ; the latter then increases 

 in size, so as to occupy a third of the interior of the animalcule, 

 and then undergoes, apparently, duplicative subdivision, for the 

 mass is sometimes seen to present a single groove, which passes 

 through the centre, and ultimately becomes divided up into 

 several segments. These segments assume a circular com- 

 pressed or globular form, and continue entire until the granules 

 or spermatozoids of which they are composed become fully deve- 

 loped, when the latter acquire the power of locomotion, and 



* Ann. des Sc. Nat. Zool. t. xix. p. 131, foot-note, 1853. 

 Ann, ^ Mag. N. Hist, Ser. 2. Vol, xviii. 15 



