ART. 2 NEW INTERNAL PARASITES — CHAPIN 3 



interlabia carry certain definite organs. The siibmedian dorsal in- 

 terlabia contain the amphids which according to Steiner are sense 

 organs of the olfactory or gustatory type. The ventral interlabiiim 

 supports in its lower part the terminal portion of the excretory duct. 

 It may be that these interlabia are modified papillae. 



CONTRACAECUM MAGNIPAPILLATUM, new species 



Male: Length 20 mm., greatest diameter 585,u, near middle of body 

 length. Lips subequal, each broader across base than high, height 

 75^1. Interlabia slightly less high, subtriangular. Labial papillae 

 as in C. turgidum. Amphids in interlabia adjacent to dorsal lip, 

 excretory pore near base of ventral interlabium. Cervical constric- 

 tion 75^1 behind base of lips. Cervical papillae 645^ behind base of 

 lips, oval, slightly prominent. Esophagus 3.2 mm. long, esophageal 

 appendix three-fourteenths, intestinal appendix three-fourths as long 

 as esophagus, respectively. Cloaca about 200jLt before the posterior 

 extremity, which ends in an acutely conical tip IS^u long. Double 

 papillae proportionately very large, the boss upon which either pair 



Figs. 3-4.-3, Contracaecum turgidum. Anterior portion of digestive tract, showing esopha. 

 geal and intestinal appendages. 4, contracaecum magnipapillatum. caudal extremity 



OF MALE 



is placed measures 43/x by 23;^. The two bosses are separated by a 

 distance equal to the shorter diameter of either. The interval be- 

 tween the cloaca and one of the double papillae is 26/x. Behind the 

 double papillae there are four single papillae, two of which are sub- 

 median, the other pair sublateral and slightly more prominent. Pro- 

 ceeding forward from each double papillae is a single row of twenty- 

 one single papillae, the last member of which is about 4 mm. in front 

 of the cloaca. The spicules are equal and similar, 3.8 mm. long, tips 

 acute, not modified as in C. turgidum. 



Female: Length 23 mm., greatest width 750,u, just bohind the vulva. 

 Anterior portion similar to that of male. Esophagus 3.37 mm. long, 

 ratios of length of esophagus to .that of appendices virtually the same 

 as in the male. Vulva on a slight prominence, 8 mm. behind the 

 anterior extremity, or abont the anterior third of the body length. 

 Vagina short (120/x) and straight, opening into a muscular and some- 

 what sinuous oviduct about 2 mm. long. Oviduct bifurcates to 



