204 S. J. JOHNSTON. 



developed collar, in its much larger collar spines (they are 



more than twice as long), and in its specially characteristic 

 tail; while its integument is armed with broad scales, that 

 of E. agnatum possesses fine spines. 



Again, the ratio of the diameter of the oral to that of the 

 ventral sucker in the latter is 1 : 5, but in the Australian 

 form it is 1 : 4. Moreover the testes in the European form 

 are much nearer the posterior end of the worm than in the 

 Australian form. 



It differs from E. aconiatum, Dietz, in being very much 

 larger (four times as great); in the number of collar spines, 

 forty-two as against thirty-seven; and in having the scales 

 with which the integument is armed much less closely set. 

 In E. aconiatum the ratio of the diameter of the oral to 

 the ventral sucker is 1 : 3. 



Further it differs from E. elegans Looss, not only in 

 being much larger and different in shape, but also in the 

 relationship of the suckers, as in Looss' species the ventral 

 sucker is twice as great in diameter as the oral, while in 

 the Australian form it is four times as great. The testes 

 are situated much nearer the posterior end in E. elegans 

 Looss. 



Echinoparyphium harveyanum, sp. n. (Figs. 8 and 9). 



Diagnosis. — A small worm with well developed head- 

 collar, bearing twenty-nine collar-spines, including six on 

 the ventral angles of the collar. Integument armed with 

 sharp spines. Ventral sucker very prominent. Ratio 

 of ventral to oral sucker 6:1. Cirrus sac reaching the 

 middle of the ventral sucker. Testes in the middle of the 

 body. Follicles of the yolk-glands very numerous and con- 

 fined to the lateral fields of the body. Eggs 0*099 - 0117 

 mm. long by 0'063 mm. broad. 



Host. — Micrceca fascinans, in the gizzard. 



