ENTAMCEBA BUCCALIS 43 



Entamceba buccalis, Prowazek, 1904. 



The size varies from 6 //, to 32 p. Ectoplasm is always present ; 

 the endoplasm contains numerous food-vacuoles. The nucleus is 

 vesicular, with a greenish tinted membrane which is poor in 

 chromatin. The size of the nucleus is from 1*5 /-t to 4-5 //,. A con- 

 tractile vacuole is not visible. The pseudopodium is broad. It was 

 discovered in the mouths of persons with dental caries at Rovigno and 

 also at Trieste, being most easily found in dense masses of leucocytes, 

 also among leptothrix and spirochrete clusters. It can be easily dis- 

 tinguished from leucocytes by more intense staining with neutral red. 

 Multiplication proceeds by fission. Transmission may take place 

 through the small spherical cysts. This species (fig. 10) has since been 

 observed in Berlin, and is also occasionally found in carcinoma of 

 various regions of the oral cavity. (Leyden and Lowenthal, 1905). 



FIG. 10. Enta niceba buccalis, Prow, a-d, the same specimen observed during five minutes. 

 x 1,000. e, amoeba fixed and stained with iron-haematoxylin. x 1,500. (After Leyden 

 and Lowenthal.) 



Entamceba buccalis, Prow., is said to be allied to a protozoon which 

 A. Tietze has found either encysted or free in the lumen of the orifice 

 of the parotid gland of an infant aged 4 months. The gland had 

 undergone pathological change, and had therefore been extirpated. 

 The organisms, which were roundish and three to four times the size 

 of the normal epithelial cells of the gland, were without a membrane 

 and possessed a nucleus in which the chromatic substance appeared 

 to be contained in a karyosome. Bass and John's 1 (Feb. 1915) and 

 Smith, Middleton and Barrett (1914) state that E. buccalis is the cause 

 of pyorrhoea alveolaris. 



Entamceba undulans, Aldo Castellani, 1905. 



Under this name a protozoon is described which A. Castellani found in addition 

 to Entamceba histolytica and Trichomonas intestinalis in the fasces of an European 

 planter living in Ceylon, who had suffered from amoebic enteritis and liver abscess. 

 The shape of the body was roundish or oval, 25/4 to 30 /* in the greatest diameter. 

 It was without a flagellum, but with an undulating membrane, and capable of pro- 

 truding a long pseudopodium from different parts of its body at short intervals. The 

 nucleus could not always be recognized in life ; it was, however, always demonstrable 



1 fourn. Amer. Med. Assoc., Ixiv, p. 553. 



