24 john e. gutberlet 



Structure of Adult and Larva (Cysticercus) 



A. adult 



Choanotcenia infundibuliformis (Goeze 1782) Railliet 1896 



1. Diagnosis: Length 50 to 200 mm. Scolex (Fig. 2) small, 

 rounded, or conoidal, about 0.4 mm. wide. Rostellum (Fig. 2, 3, r) 

 60 to 70ix in diameter, armed with a single row of 16 to 20 hooks 

 (Fig. 8) 25 to 30ju, long, with long dorsal root and short ventral 

 root. Suckers prominent, elongated antero-posteriorly, length 180 

 to 210/x; breadth 135 to 175/x between the extreme outer edges. 

 Neck short and unsegmented, somewhat narrower than broad. In 

 specimens well extended neck much narrower than head. Anterior 

 proglottids very short and as they become older funnel-shaped, 

 much narrower at anterior than at posterior margins; posterior 

 segments 1.5 to 2.5 mm. broad and 1.5 to 3 mm. long according to 

 amount of contraction, with convex lateral borders, nearly as wide 

 at anterior as at posterior margin. Genital pores irregularly alter- 

 nating, situated one in each segment in the anterior third of the 

 lateral margin, usually under cover of the backward projecting bor- 

 der of the preceding segment. Vas deferens (Fig. 14, vd) and 

 vagina pass between excretory canals and dorsal to nerve trunk. 



Male Reproductive Organs: Testicles (Fig. 14, t) 25 to 40 

 or more, 60 in some cases, in posterior half of proglottid, posterior 

 and lateral to large yolk gland, within limits of excretory canals. 

 Vas deferens passes forward and in anterior third of proglottid 

 forms a mass of coils between ovary and excretory vessels from 

 which it extends outward as a convoluted tube to base of cirrus 

 pouch. Cirrus pouch (Fig. 14, 15, cp) ovoid in shape, 75 to 95fi 

 in long diameter. Portion of vas deferens in cirrus pouch is much 

 coiled. Cirrus 50 to 65ix long, armed with spines ; outer surface of 

 cirrus pouch forms base of deep genital cloaca. 



Female Reproductive Organs: Vaginal opening in genital 

 cloaca posterior to cirrus. Vagina posterior to cirrus pouch, after 

 crossing ventral excretory canal dilated to form ovoid seminal 

 receptacle, posterior and ventral to vas deferens, extending to well 

 developed shell gland, 40 to 50/i, in diameter located in front of 

 middle of proglottid. Transversely elongated ovary (Fig. 14, o) 



