No. 634] SHORTER ARTICLES AND DISCUSSION 4ol 



ment that "there is no appreciable difference between these and 

 the general description" of the genus which MacCallum states 

 also fits C. oxycephalus. The status of this new species seems to 

 me to be doubtful. 



MacCallum 's basis for describing C. floridiance as new seems 

 to lie in the fact that 



other set of four placed behind, mid diagonally across the first. Whether 

 this condition is only an exemplification of the way in which they act 



able. They may act like a pair of hair clippers and were caug-ht in this 

 position when death took place. 



The action which MacCallum assumes is probably not the method 

 of action of these jaws. Since J have previously pointed out the 

 method of action of the jaws, no more needs to be said here on the 

 subject. The criss-cross arrangement of the ridges in the mouth 

 apparatus is well explained on the basis of MacCallum 's draw- 

 ing, which shows that the head of the worm was tilted; I have 

 often seen the same condition in poor mounts of other members 

 of this genus when the heads are twisted a trifle. The appear- 

 ance is purely an artifact. MacCallum 's next point is that this 

 worm has only two parts of the trident present, or that it has, 

 in other words, a bident. The figure does not bear out this as- 

 sertion; two typical tridents are shown, each with three prongs. 

 MacCallum states that the males have six pairs of pre-anal 

 papilla? and three post-anal pairs. 



The description of C. elegans is quite brief. The author could 

 not determine whether or not the males have one or two spicula, 

 and because the male tail is 1 ' not so complete and pretentious as 

 in C. floridiantf " he believes that the worms deserve a new name. 



In C. ptychozcondis the only feature MacCallum noted that 

 seems at all distinctive is the fact that the intestine follows imme- 

 diately after the muscular esophagus. If this is the case this 

 worm is not a member of the genus Camallanus. The anus is on 

 the left of the worm described. If the observation is correct it is 

 the first recorded instance of which I know in the literature on 

 nematodes in which the anus does not lie in the sagittal plane. 

 I am of the opinion that the worm or worms studied were twisted 

 in mounting or handling. Unless a series of sections of this 

 worm can be shown in which the lateral lines are in the same 



