ON THE LIFE HISTORY OP UGIMYA. 9 



the form of tiny tubercles. The partis ( PL II, fig. 5 c) is in the form 

 of a membranous tube, and its distal half is protected by a dark horny 

 sheath which dividing into two teeth reaches the free end of the penis. 

 At the base of the intromittant organ, and generally overlying the 

 penis as a protection, is a four toothed clasper(&) usually dark brown 

 in color, and of a chitinous nature. 



The female reproductive organ consists of ovaries, oviducts, semi- 

 nal receptacles, cement glands and vagina ( PL II, fig. 3 ). The ova- 

 ries (a) are two in number. Each of them is composed of about two 

 hundred and ten ovarian tabes, thus making about 420 tubes in all for 

 the two ovaries. As each of these tubes contains about fourteen ovarian 

 eggs of various sizes, the eggs contained in the two ovaries at any given 

 time amount to 5880 in all, although it by no means follows that all 

 these develope into the young. 



An ovarian tube (P/. II, fig. 6) is long and slender, and contains 

 throughout its length, eggs of various sizes and stages of development, 

 their presence being shown externally by a series of swellings which 

 gives to the tube the appearance of a rosary. The tube itself is en- 

 veloped by two membranes — Tunica propria (a), and epithelial layer 

 ( b ). The former is thin and delicate, and provided with a few oblong 

 nuclei (c), while the latter is composed of small nucleated cells. The 

 length of the tube is about 3 mm. It is broad at its attached end but 

 tapers gradually toward the free end, and may be divided into three 

 portions: — 1. the terminal thread (fZ), 2. the terminal chamber or 

 Germogen (c) and 3. the egg-tube proper ( /"). 



All the ovarian tubes belonging to one ovary, lie in close contact 

 with one another by their terminal threads, and open into a common 

 oviduct ( PL II, fig. 3h) with the broader end of the egg-tube proper, 

 thus giving each ovary a globular form (PL II, fig. 3 a). 



The terminal thread ( PL II, fig. G d) is transparent and very deli- 



