72 W. N. F. WOODLAND 



not pointed, the two surfaces are alike in curvature, and that 

 the proboscis does not bear the openings of a gland complex, 

 the latter being a large boring muscle, the fibres of which 

 extend a considerable distance posteriorly (probably about 

 eight-ninths of the length of the body in the three best-known 

 species) and become connected individually with giant 

 ' anchor '-cells. Thus amended the definition of the genus 

 reads as fcjllows : Body flat and varying in outline from an oval 

 to a narrow ribbon. Anterior end pointed or slightly truncated 

 according to the state of contraction ; posterior end pointed, 

 rounded, or emarginate. A small evaginable proboscis is present 

 at the anterior end, and connected with this is a 'large boring 

 muscle, the fibres of which end posteriorly in giant ' anchor '- 

 cells situated in the parenchyma. The excretory system 

 consists usually of two main lateral channels connected with 

 a system of smaller channels and opening posteriorly by an 

 approximately median single pore. Testes numerous. Ovary 

 and openings of vas deferens and vagina posterior. Uterus 

 a long convoluted duct consisting of three limbs (N-shaped 

 when viewed from the ventral surface), each extending nearly 

 the entire length of the body, and opening anteriorly at the base 

 of the proboscis and on the left side (i.e. on the side of the body 

 opposite to that on which the uterus arises from the ovary). 



I may add that in no species is there an ' acetabulate sucker '. 



Some of the more conspicuous distinctions between the five 

 known species of Amphilina are stated in the Table on the next 

 page. 



The specific distinctness of A . n e r i t i n a from A . folia- 

 cea needs confirmation. 



Three type-specimens (including one of maximum size) of 

 Amphilina paragonopora have been deposited in the 

 British Museum (Natural History) at South Kensington, 

 London. 



