284 RECOKD OF CURRENT RESEARCHES RELATING TO 



peristome (m), and terminating anteriorly in a tuft of long seta-like 

 cilia (W) ; and another row of extremely fine cilia within the peristome 

 (m), producing the so-called undulating membrane. 



The author considers that the two genera Chcetospira Lachmann 

 and Stichochceta Claparede and Lachmann should both be included in 

 Forty's genus Stichotricha. 



2. Tillina magna, nov. gen. et sp. (Figs. 4 and 13). — The length 

 of this large free holotrichous species amounts to ^ mm. The body 

 is bean-shaped, the mouth (o) being in the position of the hilum, or 

 leading into a strongly curved gullet (s). At the posterior end (H) is 

 a process of the body substance, disturbing the otherwise regular 

 contour, and lodging the single contractile vesicle (cv). The nucleus 

 (n) is large and oval. Besides the food-vacuoles [nv) the endosarc 

 contains spherical balls (p) probably accumulations of parasitic 

 bacterium-like organisms. The ectosarc (?p) is distinct and exhibits 

 radial striation, as well as fine parallel superficial lines, probably 

 due, as in Colpoda, to folds. 



Division was observed to take place in much the same way as in 

 Colpoda. A very delicate cyst is formed, and the animal then divides 

 first into two, then four masses (Fig. 13), which afterwards escape as 

 free Tillince. 



The genus is placed in the ParamcecincB between Paramcecium and 

 Colpoda. 



3. Maryna socialis, n. gen. et sp. (Figs. 5 and 6). — This is a 

 remarkable holotrichous tube-forming species ; its case closely 

 resembles that of Stichotricha, being soft, yellowish or brownish, and 

 dichotomously branched. But there is usually a constriction before 

 each fork, and the branches exhibit a distinct aunulation. 



The animal has the form of a cup (k), covered externally with cilia, 

 which are of considerable length round the edge. The latter is 

 interrupted on the ventral surface by a deep fissure. From the interior 

 of the cup rises a rigid funnel (/r), having also a fissure along its 

 ventral surface, so that in section it appears crescentic, and edged 

 with a row of very long, fine cilia. The mouth and gullet (s) are 

 j)laced just to one side of the fissure in the bell : food particles are 

 directed by the cilia down both fissures to the mouth. There is a 

 single contractile vesicle (cv), and a rounded nucleus, usually 

 invisible from the granulosity of the protoplasm. Around the edge 

 of the bell are dark granules {Kr), which the author considers to 

 be concerned in the formation of the case. 



Maryna attains a length of ^'jjmm. It is 'placed by Gruber near 

 the family Euchelydse. 



4. Oxytricha tuhicola, n. sp. (Fig. 7). — This species forms short, 

 unbranched tubes of a tolerably resistant nature. Unlike Stichotricha, 

 after division both animals leave the tube, and each forms a new one. 

 The precise characters of the animal were not well made out, a very 

 small number of specimens being found. 



5. Cothurnia socialis, n. sp. (Figs, 8 and 9). — The mode of 

 occurrence of this Infusor is remarkable. The stalk of one is 

 attached to the lorica of another : sometimes one individual will 



