22 



BULLETIN 69^ UNITED STATES NATIONAL MUSEUM. 



10 Qu,. 



Fig. 9. — Liga bkasiliensis : Entire worm. 



The worms (fig. 9) posses.s 

 from 12 to 15 segments, a num- 

 ber slightly less than that given 

 by Fuhrmann, who writes that 

 there are about 10 segments. A 

 specimien with 12 segments 

 measured 3 mm. in length by 0.7 

 mm. in width. 



The head (fig. 9) is 200/x long 

 by 400/x wide, with well-devel- 

 oped rostellum (fig. 10) armed 

 with 20 hooks (fig. 11), arranged 

 in a double crown of alternating 

 longer and shorter hooks. The 

 longer hooks measure 45 to 50^ 

 in length which is practically the 

 same size as that given by Fuhr- 

 mann. The hooks of the two 

 rows are similar in shape and 

 possess a long dorsal root and a 

 short ventral root, the dorsal 

 root and blade of the hook being 

 about equal in length. Suckers 

 135/x (ISOju Fuhrmann) in diam- 

 eter. Segmentation begins im- 

 mediately behind the head. The 

 length of the segments gradually 

 increases, and beginning with 

 about the fifth segment an in- 

 crease in width also takes place, 

 the twelfth segment measuring 

 SGOfjL long by 700fi wide. In still 

 older segments the length may 

 be greater than the width, 1 mm. 

 and O.G mm., respectively. Par- 

 enchymatous tissue of the body 

 very granular (from which ap- 

 parently the name punctata of 

 Weinland). Male organs be- 

 come functional in sixth or 

 seventh segment, female organs 

 in ninth or tenth, uterus be- 

 comes functional in eleventh or 

 twelfth segment- Genital pores 



