54 Transactions. — Zoology. 



followed by a distinct curved pharynx. Pharynx simply ciliated 

 throughout. Nucleus oval, conspicuous, sub-central. Con- 

 tractile vesicles two, near the extremities, often exhibiting 

 stellate appearance, as in the figure. Body finely ciliated 

 throughout, also sparsely striated longitudinally. 



Length gL inch = 833 yu. 



Wellington, W. M. Maskell. 



A large and distinct species, placed here in the genus 

 Tillina on account of the characters of the oral aperture 

 and pharynx. The longer ciUa of the former remove it 

 from Paramcecium, and the absence of a vibratile membrane 

 in the latter distinguishes it from Plagiopyla or Coljndium. 

 Anojjhrys has no cilia in the pharynx. Kent assigns to the 

 genus only one contractile vesicle, and in his species, as 

 well as in those reported from America by Professor Stokes,* 

 the outlines are distinctly reniform ; but these points do not 

 seem sufficient to demand a new genus for the New Zealand 

 animalcule. The shape and dimensions given above were 

 very constant in a large number of specimens observed. 



Tillina inequalis, sp. nov. Plate IV., fig. 6. 



Animalcules free- swimming ; motion rapid, gliding ; per- 

 sistent in shape, outline sub-reniform, the posterior portion 

 larger than the anterior. Oral aperture ventral, a little 

 in advance of the median line, situated in the shallow and 

 not extensive depression of the body. Oral cilia longer than 

 those of the body. Pharynx curved, not conspicuous, simply 

 ciliated : no vibratile membrane. Nucleus inconspicuous, 

 circular, posteriorly sub-central. Contractile vesicle single, 

 sub-central, near the extremity of the pharynx. The food 

 particles usually collected in a number of circular masses. 

 Body finely ciliated throughout. 



Length, -^^ iuch = 104 ^< ; greatest width, -^^ inch = 

 62 fi. 



Wellington, W. M. Maskell. 



This animalcule seems most nearly allied to T. inflaia, 

 Stokes, but difi"ers in the inequality of the anterior and 

 posterior portions, and in the shalloAvness of the depression 

 between them. The form and dimensions given are quite 

 constant. Tillina cawpyla, Stokest, is much narrower and 

 smaller generally. 



Genus Trachelocerca, 



Trachelocerca Jili/o7~>nis, sp. nov. Plate V., fig. 15 ; a, b, c. 



Animalcule highly elastic and variable ; body fusiform, 

 somewhat pointed posteriorly, produced when extended into 



* "Ann. and Mag. of Nat. Hist.," vol. xv., 6th seiies, p. 441. 

 t "Ann. and Mag. of Nnt. J^ist.," FcK, 1886, p. 101. 



