COXTRIBUTIdXS TO THK CYTor.OCV ()[■' THK I'.ACTEKrA. 505 



Fig. 108. — Long individual, in whicli the nuclear filament has divided 

 into two i^reparatory to cell division. 



Fig. 109. — Group of five- small Bacilli with darkly staining nucleus- 

 like bodies — similar to those shown in fig. 53 (PL 17). (These '•nuclei "" 

 are possibly spore-rudiments.) From large intestine of Laeerta 

 mnralis. 



Figs. 110-112. — Large Spirilla from the hind gut of Stylopyga 

 orientalis. The cytoplasm has an alveolar structure, and the 

 nucleus is of the chromidial type. 



Figs. 113 and 114. — "Fusiform Bacteria " from the large intestine of 

 Laeerta mural is. Each cell shows a single spherical nucleus. 



Fig. n •">. — ■■ Fusiform Bacterium," of doul)le form, from large intestine 

 of Bufo vulgaris. (Fixation: corrosive sublimate and acetic acid.) 



Fig. 116. — " Fusiform Bacterium," of double form, from large intestine 

 of Stylopyga orientalis. The lower nucleus in dividing. 



Figs. 117 and 118. — Bacillus sj)irogyra from large intestine of 

 Biifo vulgaris. Note the'nuclear filaments. (Fixation: corrosive sub- 

 limate and acetic acid.) 



Figs. 119 and 120. — Bacillus flexilis from large intestine of Bufo 

 vulgaris. Note the alveolar structure (jf the cytoplasm (rather in- 

 distinct) and the nucleus in the form of chromidia. The organism 

 shown in fig. 120 is undergoing division. 



Figs. 121-132. — Small Spirilla from the hind gut of Stylopyga 



orientalis. 



Fig. 121. — Small Vibrio form with terminal nucleus. 



Figs. 122-124. — Small individuals with centrally situate nuclei. 



Figs. 125 and 126. — Longer individuals with dividing nuclei. Note 

 the characteristic dumb-bell figure which the nucleus assumes. (Compare 

 with Micrococci and Sarcina.) 



Fig. 127. — Individual in which nucleus has divided into two, though 

 fission of the cytoplasm has not yet occurred. 



Figs. 128 and 129. — Dividing organisms. 



Fig. 130. — Long individual with centrally placed, undivided nucleus. 



Fig. 131. — Small Yil:>rio form. Central nucleiis. 



Fig. 132. — Smallest Vibrio form. Central nucleus in the form of a 

 minute chromatin granule. 



Figs. 133 and 134. — Bacilli of flexilis type from large intestine of 

 Laeerta muralis. Chromidial nuclei. Fig. 134 shows a dividing- 

 individual. Same forms as those shown in figs. 83, 84 (Plate 17). 



