472 PKOF. W. A. HASWELL O'S AUSTEALASIAN POLYCLADS. 



s^oualiert unci besitzen einen weissen Hot" cler sich nacli vorn und auswarts in einen 

 kiirzen Streifen fortsetzt welcher mit dem der anderen Seite divergirt. Die 

 Mundfiffnung ist zwar auch hier wie bei der vorigen Species central ; die Geschleclits- 

 (iffnuno-en sind jedoch dem Centrum sehr viel nalier geriickt und liegen im zweiten 

 Drittel des Korpers. Das Parenchym ist dicker und starker, als es bei andern Polycelis 

 der Tall ist." 



Scbraarda found his specimens on the coast of the Illavvarra district, New South 

 Wales, and in Auckland Harbour, New Zealand. 



Leptoplana anstrcilis reaches alai'ge size; the largest specimens I have seen alive were 

 .') inches long. It is subject to great variation in colour. The larger specimens are 

 very dark — -some almost black, with a lighter line round the edge. Smaller specimens 

 are much lighter — some with only a light general shade of brown, through which run the 

 branching mottled bands of olive-green that represent the ramifications of the intestine. 



Quite conspicuous features of tlie upper surface are tlie two clear colourless rounded 

 knobs on which the "tentacular" groups of eyes are borne. These are situated at about 

 the junction of the first fourth of the length of the body with the second. They are of 

 oval or elliptical outline, with the long axis directed forwards and outwards. Each of 

 them comprises about forty eyes. Smaller eyes are arranged in two groups separated by 

 a definite mesial space ; they are more numerous tlian the tentacular eyes, and are almost 

 entirely in front of them. 



The ventral surface is grey, the reproductive apparatus (or rather certain jDortions 

 of it) forming a more or less pronounced white pattern on it. The mouth is always a 

 little in front of the middle ; the male reproductive aperture is about halfway between 

 the mouth and the posterior border, and the female aperture a short distance behind 

 the male. 



The pharynx gives off about fifteen to seventeen pairs of diverticula, and the number 

 of main intestinal branches is about the same. 



The vesicula seminalis is at the junction of the lateral vasa deferentia and the 

 ejaculatory duct. From this the ejaculatory duct runs forwards to the prostate 

 reservoir. The latter is a thick-Avalled, long, oval body, the appearance of which in 

 the entire specimen differs a good deal according to the way in which it lies. In an 

 end view it presents a remarkable wheel-like appearance which is not recognizable in 

 a lateral view. In sections this wheel-like effect is found to be due to the presence of a 

 ring of longitudinal recesses which open into the lumen at the end nearest the base of 

 the penis after traversing the wall of the organ throughout its length. 



From the end of the prostate reservoir opposite that at which it enters the ejaculatory 

 duct runs forwards to the base of the penis. The latter is of great length. It encloses 

 a narrow, twice-curved, hollow, chitinous stylet, dilated into a funnel proximally, and 

 distally tapering to a fine point. In the two largest specimens it is sharply bent near 

 the apex. 



The female aperture leads into the antrum femininum, whch runs upwards and 

 backwards as a wide passage to open into the ootype or shell-gland reservoir. The 

 latter is remarkably developed, much wider than the antrum, with a minutely folded 



