482 PROF. W. A. HASWELL ON AUSTRALASIAN POLTCLADS. 



The pharynx is cylindrical, about a sixth of the entire length. The intestine is fairly 

 wide, nearly half the length, with numerous pairs of cseca, the branches of which 

 anastomose. 



The penis (text-fig., ^5^.) contains a very slender elongated chitinous stylet {st.). The 

 prostate (jyr.) is relatively long and narrow. 



The ootype is nearly vertical in position. Continuing it backwards is the wide 

 vagina; the latter bifurcates behind into two thick tubes, Avhich pass almost transversely 

 outwards, each becoming divided into two. Each of these opens into a wide thin- 

 walled sac, and there are thus four of these — the receptacula semiiils. From the vagina, 

 on its ventral side, is given off the median uterine duct, which soon bifurcates. 



The female reproductive apparatus of this species thus appears to differ in a radical 

 way from that of the species of the genus described or figured by Lang. The presence 

 of the four receptacula connected by their ducts with the vagina is, in fact, so far as I 

 am aware, a quite unique condition. In the other Cotylea in which they have been 

 found to occur the " accessory glands " are connected with the oviducts (see Lang, 

 pp. 297--300, pi. 23. figs. 1 & 3, pi. 24 fig. 1, &c.). 



I have only one example of this interesting form — an old stained and mounted 

 specimen obtained in Port Jackson. 



Prosthiostomum maculatum, n. sp. (Plate 37. fig. 7.) 



The largest specimen is about 2 cm. in length and 7 mm. in breadth in the preserved 

 condition. Both anterior and posterior ends are rounded. The general colour of the 

 dorsal surface is light brown with a few^ large darker spots. The " cerebral " eyes 

 are disposed in two elongated imperfectly separated groups completely united in front, 

 each comprising about 50 in a mature specimen. There are about 100 marginal or 

 submaro'inal eyes in front of these. The mouth is situated immediately behind the 

 cerebral eyes at the junction of the first and second sevenths of the length. The sucker 

 is a little behind the middle of the body ; the reproductive apertures, a little in front of 

 this, are nearly in the middle. 



The sucker is a pit with a narrow opening. The integument lining it has its epidermis 

 o-reatlv thickened, and is thrown into a number of radiating folds around a longitudinal 

 slit bordered with a number of minute papillae. 



The cvlindrical pharynx is about 5 mm. in length (about a fourth of the total length) 

 and 1-5 mm. in diameter. There are about 12 pairs of intestinal caeca. 



The structure of the reproductive apparatus agrees closely with that of the corre- 

 sponding parts in P. siplmuculus, as described by Lang. 



Tlie antrum masciiUnum extends in a vertical direction for a short distance, passes 

 slightly behind the male aperture, then runs forwards again, becoming strongly bent on 

 itself. At its anterior end is the papilla, from which the apex of the penial stylet 

 projects. The prostate reservoir is a small rounded dilatation of the ejaculatory duct. 

 The median vesicula is of great relative size with very muscular walls. The lateral 

 (accessory) vesiculae semiuales are smaller, spherical bodies with very thick w^alls and 

 small lumina 



