Eohinostoiimni gfarzettae n. sp. 547 



The vitellarium is disposed in abundant lobules along- the sides 

 of the body, the lateral (•ollecting- ducts imiting- at the level of the 

 ovaiy to form trausverse ducts which uiiite and i)ass forward in the 

 median line to meet the uterus. 



The central nervous System consists of ganglia lateral to the 

 Pharynx with a heavy supra-pharyngeal commissure. Nerve trunks 

 pass as usnal anteriorly and posteriorly from these ganglia i'unning 

 back laterally throughout the body. 



AVith regard to the systeniatic position of this form I haA^e been 

 at some pains to investigate all the described si)ecies of the genus 

 Echinostomum into which, from the form of the head disc and the 

 general arrangemeut of its organs. it undoubtedly falls. ^Fany of 

 these are found in birds and even in the intestine of birds closely 

 related to the host of our form but of the sixty-three species reviewed 

 only a few are found to resemble it closely enougli to atford any 

 possibility of identity with it. Several species E. dujardini, gadonim, 

 labracis, pungeus, doacinum, ramosum and tahulafum could not be 

 compared as the literature was not at hand but since these are 

 chiefly forms parasitic in tishes and amphibians it is probable that 

 the risk of error is slight. Of the others the type form E. echinatmn 

 Zeder and its related forms seem to resemble it most closely. 

 E. echinatum is found in various species of wild and domestic birds 

 but it as well as E. dilafatum (which Stossich considers identical 

 or synonymous) is found to be easily distinguishable in that it possesses 

 only 87 spines in its cephalic disc arranged in part at least in a 

 double row while this worm has 45 — 47 spicules arranged practic- 

 ally in a single row. 



The general conformation and arrangement of the organs as 

 well as the size and habitat are very similar indeed and we must 

 consider these forms very closely related. Echinostomum recnrvatum 

 Linst, of which 1 have had the opportunity of examining a specimen 

 determined by Stossich agrees well also in its general structure 

 and in the number and arrangement of its spines, but it cannot be 

 confused with this form on account of its minute size 3 X -7 mm. 

 The accessible descriptions of E. cinctum and E. nucmatum suggest 

 a resemblance but E. cinctum ditfers in being ver}^ mucli smallei- 

 and in being* possessed of a general covering of si)ines together with 

 a head disc which is described as suborbicular by Diesixg. 

 E. uncinatum is also possibly similar but from the vague description 

 of Diesing it is seen to differ in possessing a flattened linear body 



