475] 



PSEUDOPHYLLIDEA FROM FISHES— COOPER 



187 



Specific diagnosis: With the characters of the genus. Large cestodes with 

 maximum length, breadth and thickness of 870, 6 and 2mm., respectively. 

 Scolex variously shaped; usually rounded posteriorly and truncated anteriorly; 

 with prominent bothria and terminal disc. First segment may or may not be 

 elongated to form a short neck. Proglottides at first broad and short or more 

 quadrate, cuneate or infundibuliform in shape; in the middle of the strobila, 

 five or more times broader than long; posteriorly, quadrate or as long as broad. 

 Usually a median longitudinal groove dovra each surface of the strobila formed 

 by emarginations on the posterior borders of the segments. 



Cuticula 4 to 6)u thick, subcuticula 40 to lOOyu. Calcareous bodies (?) absent 

 in adult strobilas. Longitudinal muscles not in bundles; no muscular septa 

 between proglottides. Nerve strands 25 to 40ijl in diameter, dorsal to inner 

 end of cirrus-sac. 12 chief excretory vessels, 6 on each surface just within 

 the transverse muscles, reduced to 6 or 8 anteriorly. 



Genital cloaca irregularly alternating, but unilateral for long stretches; 

 from one-third to one-half way along the margin of the proglottis. Vagina 

 opens ahead of and slightly ventral to the cirrus; no distinct hermaphroditic 

 duct. 



Testes within the nerve strands, pseudostratified, continuous from joint 

 to joint; elongated dorsoventrally, 95 to 115 by 70 to 100^; 40 to 150 in num- 

 ber. Vas deferens lateral, elongated, with few coils before entering the cirrus- 

 sac, 350 to 600 by 100 to 180^^ in dimensions. Cirrus-sac ovoid with narrow 

 end outward, 130 to 380 by 60 to 150/i. Cirrus proper an almost straight tube 

 in outer half of sac. 



Ovary comparatively small, irregular or somewhat lobed, with thick isth- 

 mus, 0.8mm. wide by 0.13 long. Oocapt 40/z in diam-eter. Usually two ven- 

 tral vitelline ducts unite to form a common duct which does not act as a reser- 

 voir. Vitelline follicles irregular in shape and size, among the longitudinal 

 muscles or outside of them, discontinuous. Shell-gland small, compact, dorsal. 

 Uterine duct with only a few coils near the median Une. Uterus-sac trans- 

 versely elliptical or somewhat quadrate and slightly lobed, rounded laterally 

 filling up almost the entire proglottis when gravid; opening in the median line 

 opposite emarginations of segments ahead. 



Eggs, 45 to 115 by 30 to 75^1; ovoid or eUipsoid in shape. 



Habitat: In the pyloric coeca and intestine of the host. 



