206 S. J. JOHNSTON. 



The testes are elliptical and smooth-edged, 0*485 x 0*194 

 mm. in size. They lie close in the middle line, one closely 

 foehind the other. The small almost spherical ovary, 0*136 

 x 0126 mm., lies in front on the left side. 



The yolk-glands, which run from a point some distance 

 ■behind the ventral sucker to the posterior end, are confined 

 to the lateral fields of the body, and do not anywhere pass 

 toeyond the intestinal limbs towards the middle line. The 

 follicles are rounded 0*027 - 0*037 mm. in diameter. The 

 uterus is short and little coiled, and the eggs few, large and 

 variable in length, 0*099 - 0*117 long by 0*063 broad. 



E. harveyanum differs from all the other species of 

 JEchinoparyphium in the small number of its collar-spines 

 and in the close approximation of its ventral sucker to the 

 anterior end. It differs from E. aconiatum and E. oxyurum 

 in having the integument armed with sharp-pointed spines 

 instead of rounded scales. The ratio of the oral sucker to 

 the ventral is 1 : 6. The relationship in size of the oral 

 and ventral suckers shows a very interesting gradation in 

 the species of this genus. In E. elegans, Lss. it is 1 : 2 ; 

 in E. aconiatum, Dietz, it is 1 : 3 ; in E, oxyurum, mihi, it 

 is 1:4; in E. agnatum, Dietz, it is 1 : 5; and in E. har- 

 veyanum, mihi, it is 1 : 6. 



ECHINOCHASMUS TENUICOLLIS, Sp. UOV. (Fig. 5.) 



Diagnosis. — Small worms of slender form, with a slender 

 neck. Collar spines twenty-seven. Ratio of oral to ventral 

 ■sucker 1 : 5. Genital pore at the anterior edge of the 

 ventral sucker. Testes three-lobed. Ovary on one side 

 of the middle line. Uterus little coiled. Anteriorly the 

 field of the yolk glands ends some distance behind the 

 ventral sucker, and spreads over to the middle line behind 

 the testes. Eggs 0*084 x 0*058 mm. 



Host. — The common Shag, Phalacrocorax melanoleucus, 

 in the intestine. 



