1922.] 



H. A. Baylis and R. Daubney : Parasitic Nematodes. 



323 



:x- — - 



- - — 



\ 



1 



■nr. 



Fig. 57.— 

 lateral view. 



b.. buccal valve 

 lae; t., "trident." 



0-1 771771. 



Camallanus kachugae. 



Head of female I 



anterior angles, is 0-13-0-15 mm. in the male, 0*17 mm. in the female. The chitinous 

 buccal valves are slightly broader than long, their length (not including the posterior 

 ring) being 0-11-0-13 mm. and their width 



about 0-14-0-16 mm. The number of .....p. 



longitudinal ridges on each valve is either 

 eight or ten, the latter number being seen 

 only in large specimens. The posterior 

 ring of the buccal apparatus has a dia- 

 meter of o-i mm. The dorsal and ventral 

 "tridents" are well developed, and the 

 middle prong measures o - o8-o-i mm. in 

 length. The head bears three papillae 

 on each side near the extremity. The 

 oesophagus shows the usual division into 

 an anterior, clear, muscular portion and 

 a posterior, more opaque, glandular por- 

 tion. The former is distinctly club- 

 shaped, and (measuring from the ex- 

 tremity of the head) o*54-0'66 mm. in 

 length. The total length of the two 

 portions (from the head-end) is 1-18-1-55 

 mm. The minute, bristle-like cervical 

 papillae are situated at 0-5-0-55 mm., the 

 nerve- ring at 0-2-0-23 mm., and the 

 excretory pore at about 05 mm., from the anterior end. The intestine is very narrow, 

 considerably more so than the oesophagus. 



In the male the tail measures about 021 mm. in length. The alar region is 

 somewhat thicker than the preceding portion of the body. The ventral region 

 between the alae is probably capable of being depressed by the action of the well- 

 developed caudal muscles, so as to produce the effect of a sucker. The number and 

 general arrangement of the caudal papillae are the same as those described for certain 

 other species (G. microcephalics, C. américaines). Unfortunately, although a number of 

 species of Camallanus have been described, the majority of the descriptions are very 

 incomplete, and it is impossible to determine whether the number of papillae is constant 

 throughout the genus. It seems probable, however, that the seven pairs of rib-like 

 preanal papillae, projecting into the alae, will be found to be constant. The present 

 species has, in addition to these (fig. 58), six pairs of postanal papillae and two small 

 pairs of adanal papillae, as in the two other species cited. Their arrangement agrees 

 more closely with that of C. microcephalics than that of G. americanus, in that the first, 

 or most posterior, pair occupies an isolated position close to the tip of the tail. The 

 second pair is also isolated. Pairs 3 to 5 form a group, close together. All these are 

 lateral in position, while the sixth pair is more ventrally situated, just behind the cloaca. 

 The two small adanal pairs are not indicated in the figure. The two spicules are very 



n.r., nerve-ring; p.,p , papil- 



