192 Records of the Indian Museum. [Vol. XIY, 



(fig. 6, i)s.), much as in PI. polychroa. A large number of eosinophil 

 unicellular glands, occurring in a cluster around the genital aperture, 

 discharge themselves into the atrial part of the sheath. 



Numerous follicular testes are placed close together in the dorsal 

 parts of the body, arranged in two longitudinal lateral zones which extend 

 from the ovarian region to nearly the posterior end of the body. 



The vasa deferentia, filled up with spermatozoa, can be clearly made 

 out in the pharyngeal region. After running backward in the usual 

 way, they rise obliquely upward to enter, each separately, the bulbous 

 part of the penis at the upper lateral sides. After that they again 

 slant down and finally open into the lumen of the penis or the ejacula- 

 tory duct. This is devoid of the annular outbulging which we have 

 seen in the preceding form. 



The penis consists of the hemispherical bulb and the conical and 

 massive intromittent part which is horizontally disposed in the penis- 

 sheath. The bulb contains a relatively narrow and smooth-walled 

 seminal vesicle, which posteriorly narrows gradually into the ejaculatory 

 duct. In its course the ejaculatory duct receives laterally the vasa 

 deferentia and throughout its length the eosinophil penis-glands, which 

 are profusely present in the body-parenchyma around the penis-bulb. 



The ovaries are nearly spherical in shape and are present in a pair 

 close behind the brain and probably between the first and second pairs 

 of the lateral branches of the anterior gut -trunk. 



The oviduct of either side leaves the ovary in the form of a funnel- 

 like widening, which is filled with spermatozoa. For the rest of its 

 length it is a narrow duct running just outside the longitudinal nerve- 

 trunk ; in the region of the genital opening it nears the median line, 

 slightly rising at the same time, and finally opens into the vaginal canal 

 from behind and at a point near the outer end of it. The vitelline 

 glands extensively fill up the interspaces between gut diverticula. They 

 are in connection with the oviduct at numerous points by means 

 of a spherical or pyriform giant cell. 



The receptaculum seminis is a nearly fusiform sac-like organ, situated 

 dorsally in front of the penis. It is lined with an epithelium of elongate 

 cylindrical or pyriform cells. The appearance of the cells varies much 

 with the state of their secretory activity ; the protoplasm is either 

 entirely homogeneous or contains some globules, and at other times it is 

 vacuolated. They rest upon a delicate basement-membrane, close to 

 which is a feeble layer of muscular fibres. Some small glandular cells 

 of a pyriform shape are found in close apposition to the wall of this organ 

 in the posterior parts, as shown in fig. 7. 



Of interest is the fact that the receptaculum seminis of this specimen 

 contained a spermatophore, or rather the capsule of an empty spermato- 

 phore. Unlike that of PI. forva, gonocephala, striata and of the preceding 

 species, the spermatophore of the present species appears to be of a 

 tubular form, irregularly twisted as it lies in the cavity of the 

 receptaculum. The capsule is thin, homogeneous and apparently of 

 an elastic nature ; it stains deeply with eosin, agreeing in this respect 

 with the eosinophil secretion of the penis-gland, and differing 

 from the cyanophil secretion of the receptaculum seminis. The fact 



