E. H. STRICKLAND. 



From this table it will IK- seen that when there is but one worm 

 in ,1 hn-i ii .it Min- a length of about 3 cm. (luring its parasitic 

 lil'c; that is, roughly eibout three times the length of the host itself, 

 since the average length of a parasitized larva is 10.5-1 1 mm. 

 It will al-o be -cen that in one case as many as twelve worms 

 \\ere removed from a single host, and that in this case they all 

 remained small, owing doubtless to insufficient food supply. In 

 other instances, however, where several worms were present in 

 one host ii \\a- noticed that one had attained almost to the normal 

 size of 3 cm. wherea- the remaining worm or worms were less 

 than I cm. in length. 



The larval measurements showed that parasitized larva- a\ erage 

 about i i mm. (Plate III., Fig. 8</ ) whereas mature, and therefore 

 -' niie\vhat contracted, larva-, a\ crage some 8-8.5 mm. (Plate III., 

 Fig. 86), though a few are abnormally large. 



Li !!: HISTORY OF TIIK WMKM. 



As yet nothing is known of this except during the latter pan 

 of tin- life in its host. In all probabilit\ tin- eggs or young 

 worm-, are caught as they float down stream by the outspread 

 larval rake- and are M\ept into tin- mouth, passing into tin- ali- 

 mentar} .ract through the walls of which they bore- their way 

 till they enter the body cavity. It should however be noted 

 that no Bears or hypertrophy of the wall of the alimentary 

 tract \\cie noticrd in -.everal serial section'- made of parasiti/ed 

 larvae. Tin- alleniati\r hvpothi--is i- that the larval \\orm- bore 

 into their hosts through the thin cuticular covering of the ab- 



