WATSON : ANATOMY OF HELICAEION. 101 



the intestine are embedded, and which is partially divided by 

 them into three main lobes, the most posterior of these lobes 

 sending forward an unusually large prolongation between the 

 stomach and the rectum. Hepatic ducts opening into the hinder 

 part of the stomach, the anterior duct being rather large. 



Feee Retractoe Muscles. — Buccal retractor united with the 

 left tentacular retractor for a short distance posteriorly, 

 bifurcating in front, the two branches being shorter than in 

 H. gomesianus but similarly innervated. Tentacular retractors 

 separate from their origin, dividing fairly far forward into the 

 muscles of the upper and lower tentacles, but giving off no branches 

 to the foot. Retractor of right upper tentacle passing between 

 the penis and the vagina. The so-called tail-retractor is short 

 and not separated from the body-wall, but it gives off a muscle 

 which passes forwards along the right side of the body-cavity 

 and is inserted in the skin near the head. Penial retractor short, 

 passing from the diaphragm to the epiphallus. 



Repeoductive Organs. — Hermaphrodite gland large, con- 

 sisting of numerous very small follicles embedded in the posterior 

 division of the liver, as in H. gomesianus. Hermaphrodite 

 duct slightly swollen and very much convoluted throughout the 

 central part of its course, bearing a rather small, subcylindrical 

 vesicula seminalis at its anterior end. Albumen gland not very 

 large in the specimens examined. Common duct somewhat 

 contorted, especially towards its hinder end ; prostate gland well 

 developed, extending far forwards. Free oviduct short and rather 

 narrow. Receptaculum seminis or spermatheca moderately large, 

 spherical, and thin- walled ; situated beside the middle of the 

 common duct. Receptacular duct unbrauched, long and broad, 

 with unusually thick muscular walls, longitudinally folded within. 

 Vagina very short, without appendages. 



Vas deferens slender excepting towards its posterior end, 

 where it is somewhat broadened, slightly convoluted near its 

 junction with the epiphallus beside the anterior end of the penis. 

 Both vas deferens and epiphallus longitudinally folded within, 

 but not so strongly as the receptacular duct. Epiphallus long, 

 divisible into two portions — a rather thin-walled portion, running 

 backwards beside the penis-sheath to just beyond its posterior 

 end, and a slightly broader, more muscular portion, which first 

 runs forwards for a very short distance, and then doubles back, 

 finally passing forward again into the penis-sheath, which conceals 

 the rest of its course. Penial retractor muscle inserted in the more 

 muscular division of the epiphallus just before it enters the penis- 

 sheath. Two flagella are borne by the epiphallus, one where its 

 two portions pass into each other not far from the posterior end of 

 the penis-sheath ; the other where the vas deferens passes into the 

 epiphallus, near the anterior end of the penis-sheath. The latter 



