558 A DESCRIPTION OF THE ENTOZOA COLLECTED BY DR WILLEY 



region this dimension decreases towards the head (Fig. 28, Plate LVI.). Towards the 

 tail it increases and the increase is accompanied by a diminution of the lateral diameter 

 until the breaking off proglottides are almost as long as they are broad. 



Looking down on the head the anterior surface presents two funnel-like depressions 

 which are lateral]}- placed. The lips of the funnel — the " ears" of FuhiTuann — are not 

 complete but a slit exists laterally. The edges of the slit usually overlap, they run 

 into one another at an acute angle situated laterally between the dorsal and ventral 

 suckers and about equidistant between the anterior and the posterior limits of the 

 head (Fig. 27, Plate LVI.). The whole relation of the edges of the funnel resemble 

 those of the spathe of an Arum. Had the edges fused instead of overlapping the 

 funnels would then have been complete and would have resembled those described 

 by Perrier' in his genus Duthiersia. In this genus the funnel opens by a small 

 pore at the narrow end and the edges are much folded and crinkled. 



The two dorsal and the two ventral suckers are completely separated from one 

 another anteriorly by the funnel and posteriorly by a slight groove or line which 

 runs a little distance backwards from the posterior limit of the funnel. The right 

 and left funnels, both dorsal and ventral, tend however to fuse and the median dorsal 

 and ventral ridge which lies between the right and left sucker of both aspects 

 diminishes anteriorly until the suckers tend to run into one another. Thus the outline 

 of the rim of these suckers resembles a Greek &> with the upper limbs joined together. 



The first proglottides are narrow and well marked, posteriorly however they swell 

 out and their anterior and posterior edges overlap the narrow stalk which connects one. 



It is very difficult to explain the exact relationship of the flaps of the funnels 

 to the suckers, originally it looks as if the outside of the flaps on. each side were 

 the original suckers and that the ridge which has been described above is a later 

 development. In transverse section it is seen that this ridge is separated from the 

 surface of the flap by a basement membrane, and it has the appearance of being 

 stuck on (Fig. 29, Plate LVI.). The four longitudinal vessels appear in the same figure, 

 they continue as far forward as the second section in one series I had cut and then 

 simply run one into another, there is no such plexus in the head as there is for 

 instance in C. kuvaria. All through the head the diameter of the vessels remains 

 constant, and the dorsal vessels are slightly smaller than the ventral. 



The reproductive pore is in every proglottis laterally placed and on the left. 



Besides the specimens just described I have in my possession from the same host 

 several long fragments of a tape-worm which I am unable to identify. They were given 

 to me by Mr F. F. Laidlaw, of Trinity College, who had extracted them from an 

 Albatros, but the want of preservation and the cold storage to which the bird had 

 been subjected on its journey to England had apparently injured the specimens and the 

 state of their preservation was bad. Several of the fragments attained a length of 

 6 or 7 in. but they were very fragile and easily broken. Although I made a most 

 careful search I was unable to discover a single specimen with a head. 



1 Arch. Zool. (jp. II. 1873, p. 349. 



