FLAGELLATE INFUSORIA AND ALLIED ORGANISMS. 95 



there any appearance of contraction. But little is known, 

 and that not certainly, of the reproduction. 



Individuals have been met with which were provided with 

 two tufts of cilia instead of with one, and which exhibited 

 all that peculiar arrangement under each of the tufts, which 

 would be present in an ordinary individual. Such speci- 

 mens were always very variable in form, at one time con- 

 tracting themselves to such a degree that the two clusters 

 of cilia stood close together, and again extended themselves 

 till they were upon opposite ends of the body. From what 

 is at present known as to the prelude to division amongst 

 the Flagellata, we are led to believe that these forms are 

 about to undergo fission. On the other hand, it may be 

 argued that such forms have been watched for a long time 

 without any further advance in the process of division being 

 observable. 



A considerable number of individuals were once seen whose 

 posterior extremities were beset with small cilia, but it has 

 not been decided whether these forms stood in any relation 

 to the final state of division. Very large specimens measured 

 about 0*03 mm. ; but, as already noticed, there are remarkable 

 differences in size, as is shown by the figures 21 a and 21 b. 



Lophomonas striata, n. sp. ? 



The form to be described under this name (Plate vi, fig. 

 21 c d) is also found in the rectum oi Blattaorientalis. This 

 peculiar organism, in relation to its possession of a large 

 anterior tuft of cilia, is closely allied to Lophomonas hlat- 

 tarum, and the finer details of structure are exactly the same 

 as in the ordinary kind. The form of the body, however, is 

 very different : it is usually elongated and spindle-shaped, 

 whilst the anterior end, for the reception of the tuft of 

 flagella, is somewhat sharply conical, in opposition to the 

 usually broad end in Lophomonas blattarum. Only occa- 

 sionally is there any important deviation from this form : 

 the spindle, however, appears sometimes longer, at other 

 times- shorter. Once a small form was seen (fig. 21, c), 

 which differed notably from the ordinary individuals in the 

 possession of an oval rounded body. The length of the body 

 is the same on the average as in Lophomonas blattarum, 

 but it is usually somewhat greater in the elongated spindle 

 forms. The comparatively stiff and unbending nature of 

 the body protoplasm is very peculiar, in contrast with 

 the transparent protoplasm of the forms hitherto 

 described. A very typical spiral longitudinal banding 

 is seen, it is sometimes regular, at other times irregular. 



