224 Mr. H.J. Carter on the Oi-ganization of Infusoria. 



becomes more marginated or distinct, and assumes a nucleolar 

 form. In Spongilla there is also a delicate, pellicular layer, which 

 is endowed with a low power of movement (figs. 39 A, 40«). 



I first noticed these ovules in the seed-like bodies of SpongillUy 

 where they are enclosed in transparent globular sacs*, each sac 

 holding a greater or less number of ovules, which are discoid in 

 form, of different sizes, and accompanied by a great number of 

 active molecular granules (figs. 37, 38) ; and during the past year 

 1 have frequently seen such in Amoaba Gleic/ienii, where they have 

 been equally numerous, have borne the same characters, and have 

 been accompanied by a number of active molecular granules, as 

 in the transparent globular cells of the capsules of Spongiila(1n^. 5.) 

 They occur also in Euglypha alveolataf, congregated round the 

 hyaline capsule of the nucleus, from four to fifty in number, and 

 mostly of the same size, but always globular, and accompanied 

 also, as in Spongilla, by molecular granules (fig. 26). Such 

 ovules may also be seen similarly situated in Diffiugia tricuspis 

 (H. J. C.) and in Arcellina dentata (Ehr.) ; enclosed in the latter 

 in an ovoid capsule, which nearly fills the test. In Actinophrijs, 

 also, they appear to have been seen by M. Nicolet, as will be 

 mentioned hereafter. 



Astasia and Euglena constantly become filled with discoid 

 cells of a similar kind, but in those of the former I have seldom 

 been able to distinguish the capsule from the internal contents, 

 on account of their smallness and the incessant motion of the 

 animalcule (fig. 46) . In Euglena, however, they are very evident, 

 and it is worthy of remark that each partakes of the form of 

 the Euglena to which it belongs (figs. 50, 58). Thus in E. acus it 

 is long and cylindrical ; in E. viridis oblong, compressed (fig. 59); 

 in Crumenula texta and Phacus circular, compressed, &c. 



In Spongilla and Amoeba these ovules follow the motions of 

 the sarcode, in which they appear to be loosely imbedded ; they 

 also undergo partial transposition in Astasia and Euglena, but 

 in Euglypha and Difflagia are chiefly located round the globular 

 hyaline capsule of the nucleus, at the posterior part of the 

 body (fig. 28), — a position which it is well to remember; for 

 although apparently unconnected in all, with the nucleus and 

 its capsule, and diffused generally throughout the sarcode in 

 Spongilla, Amoeba, Astasia, and Euglena, yet in Euglypha and 

 Diffiugia, which we shall hereafter find the best for typical 



* Ann. and Mag. Nat. Hist. vol. iv. p. 87, 1849. Of the formation of 

 the seed-like body, I need not say more here, than that it consists of a 

 capsuled aggregation of ovule-bearing sponge-cells ; while Amceha presents 

 the same appearance, when pregnant with ovules, as one of these cells, and 

 becomes capsuled singly. 



t Dujardin, Hist. Nat. des Zoophytes, Atlas, tab. 2. fig. 9. 



