HARDWICKE'S SCIENCE-GOSSIP. 



137 



focussing still deeper, the granules of the endosarc 

 are seen. In the specimen drawn they exhibited 

 what [is known as the Brownian movement. This 

 molecular motion is seen when minute particles are 

 suspended in water, and here we may take it as a 

 further proof of the fluidity of the endosarc. There 



thin at the anterior end. The protoplasm may be 

 divided into two parts, that in the anterior region is 

 hyaline, narrow and flat, and constitutes the neck ; 

 the posterior body is more granular, broader and 

 fatter, it tapers *o a blunt tail, which is again less 

 granular. The neck is turned up at the end, forming 



Fig. 84. — Spirostomitm ambiguum ; 1, m, mouth ; t, striated tail ; A, anterior ; p, posterior end ; 2, n.iddle portion 

 my, myophan striation ; 3, with spirally marked tail, T. 



are two contractile spaces which here again exhibit 

 systole and diastole. 



The nucleus is round and seen to consist of a 

 delicate membrane (Fig. 83, d memb.) and the 

 faintly granular {nuclein, gr. in Fig. 83 d) and 

 hyaline material enclosed therein. 



There is a red spot frequently seen near the 

 posterior end (Fig. S3 r.s.). There is here, there- 

 fore, a common resemblance between this member 

 of the Infusoria and the Alga? before mentioned. 



The oesophagus instead of being ciliated, as in 

 many of the Infusoria, is raised into folds which have 

 been described as chitinous rods forming an apparatus 

 known as the pharynx, which is supposed to seize 

 hold of diatoms and force them into its interior. 

 The food of chilodon seems to be diatoms, which 

 may usually be seen in the endosarc. I have seen 

 several occupying one large cavity (Fig. 83 c), pro- 

 ducing a distortion of outline. 



19. Amphileptusfasiola (Fig. 81, I, 2), length given 

 in the Micrographic Dictionary is from the seven 

 hundred and twentieth to the one hundred and forty- 

 fourth of an inch. This infusorian appears in front 

 view somewhat pear-shaped ; side view, it is especially 



a kind of snout. The cilia can be seen, with care, to 

 cover the surface, and at the snout and tail to present 

 the appearance of a tuft. In the posterior region 

 there is a triangular contractile space. The position 

 of the nucleus is marked out by granules which 



Fig. 85. — a, Enchelys nodulosa (d.) ; b, Halteria graildinella. 



surround it, and staining shows a double endoplast 

 situated in this position. The mouth is placed at the 

 junction of the neck with the body. 



20. Dileplus folium (Fig. 81, 3), the swan animal- 

 cule, is somewhat similar to, but much larger than 



