970 SUMMARY OF CUKRENT RESEARCHES RELATING TO 



Tlic cfibct of ccrtftin rcjigcnts (osiiiic acid 1 per coiit.) and dyes (alura- 

 carmiue) should also be ascertained. In his present comniunicatiou tlio 

 author describes the following Protozoa: — 



1. Biu'tschlin with two new sjiecics parva and neglecta. (a) B. parca 

 is 0'0;J-0-53 mm. long, 0" 20-0 -038 mm. broad, oval, occasion- 

 ally spherical. The oral aperture is at the anterior extremity and 

 leads into a naiTow conical gullet. Ciliation is confined to tliis extremity, 

 but there is no special arrangement of the cilia. Highly nfracting con- 

 cretions arc always to be seen in a vacuole situated somewhere in the 

 anterior extremity. A special contractile vacuole appears to be wanting. 

 Nucleus spherical. Multiplication by division was observed. 



(6) J5. neglecta, 0-057 mm. long and 0*0 12 mm. broad, resembles in 

 general the last variet}', but has in its posterior half four deep jnts, so 

 that a transverse section thereof would present the app' aranccof a cross. 

 Other differences are that this variety presents a tuft of cilia at the 

 posterior and also cilia at the deepest part of the four pits. Vacuoles 

 are always present. The nucleus is large, pale, and spherical. 



2. (o) Isotricha prostoma Stein, 0*08-0 '16 mm. long by 0"053 to 

 • 12 mm. broad ; very frequent ; body elastic, not contractile, cylin- 

 drical, anterior and posterior extremities pointed, sides somewhat 

 flattened. The whole body is beset with cilia arranged in rows, and 

 beneath the cilia lies a thick refracting membrane, which an addition of 

 water lifts uj), preserving its continuity with the body only at the anterior 

 and posterior extremities. Numerous contractile vacuoles in the proto- 

 plasm. The nucleus resembles in shajie that of the body, and on its 

 dorsal side is a small bright nucleolus. It is especially noteworthy that 

 the nucleus is attached to both the inner and external membranes by 

 fibres, the significance of which is enigmatical. Propagation by fission 

 was observed. 



{h) I. intestmalis Stein, 0-097-0-131 mm. long by 0- 068-0-087 mm. 

 broad, is very closely allied to I. j^rostoma, the most imjiortant difference 

 being that the position of the mouth is almost in the middle of the body 

 and also the somewhat more compact form of the nucleolus. 



3. (a) Dosiitricha ruminantium nov. gen. nov. sp., 0' 05-0*1 mm. 

 long, * 025-0 * 066 mm. broad ; very frequently confounded with Isotricha. 

 Viewed from the ventral or dorsal aspect the body is oval, from the sides 

 it seems somewhat compressed and bent inwards ventrally. The whole 

 body is ciliated and invested in a double membrane. The mouth and 

 pharynx are situated anteriorly. There is only one contractile vacuole. 

 The nucleus is granular, oval, and possesses a nucleolus lying external 

 to it. There are no nuclear prolongations. Propagation appears to take 

 place by budding. 



4. (a) Entodinium bursa Stein, 0*055-0* 114 mm. long, 0-037-0*078 

 mm. broad, not very frequent. Body dorsoventrally flattened, somewhat 

 oval, but more obtuse anteriorly. About the centre of the posterior 

 extremity is a somewhat tortuous pit which receives the anal cleft. The 

 cilia are confined to the anterior extremity where the oral aperture 

 leading into a deep conical pharynx is situated. There is a contractile 

 vacuole. The elongated sausage-shaped nucleus has a shining nucleolus. 

 Propagation by fission. 



(h) Entodinium caudatum Stein, 0*053 mm. long, 0*026 mm. broad, 

 distinguished from E. bursa chiefly by its shape, the dorsal surface being 

 less incurved than the ventral which on the lett side is hollowed out, and 



