202 



S. J. JOHNSTON. 



glands do not extend into this tail. The posterior half of 

 the body is 0*425 mm. wide. 



The head-collar is well 

 developed, and nearly as 

 wide (0*543) as the body 

 in its widest part. It has 

 the usual reniform shape 

 and bears along its e(Jge a 

 single uninterrupted row 

 of thirty-four spines. In 

 his diagnosis of the genus 



Fig. 9.-Head collar and spines of "DietZ says^ 13 ' * 379 > "Kopf- 



Echinoparyphium oxyumm kragen nierenformig mit 



doppelter, dorsal nicht unterbrochener stachelreihe 

 bewaffnet." But I do not consider this feature of sufficient 

 importance to make a generic distinction. Indeed, in a 

 second species of this genus, which I describe below, the 

 collar spines might be considered to be in a double row 

 (see fig. 9, pi. xn), but they are so nearly in a single row 

 that the difference in position might easily be overlooked. 

 In E. oxyurum, however, they cannot be detected to lie in 

 two rows. In addition to the row round the edge this 

 species bears a group of four spines on each ventral lobe 

 set at a different angle to the others, so that there are 

 forty-two collar-spines altogether. The longest spines are 

 0*091 mm. long. 



The integument in the region between the head-collar 

 and the ventral sucker is armed with closely set scales or 

 scale-like spines. These scales have a rounded free edge, 

 and the part projecting on the surface is rather broader 

 than long. The region of the body between the head- 

 collar and the ventral sucker is concave through the bend- 

 ing down of the lateral edges of the body. 



