474! PEOF. W. A. HAS WELL ON AUSTKALASIAN POLTCLADS. 



small specimens of the latter, however, the reproductive apparatus is undeA^eloped, 

 whereas the small forms now uuder consideration are sexually mature. In the 

 reproductive system the main differences may be reduced to differences in proportions : 

 the penial stylet, granule reservoir, vesicula seminalis, antrum feniininum, and recep- 

 taculum seminis have all the same general character as in L. australis. Perhaps the 

 most important difference is in the great relative width of the dorsal limb of the vagina 

 (or duct of the seminal receptacle). 



From Lyttleton Harbour, from Waiheke, Auckland Harbour, and from Kaikoura, 

 I have specimens of Leptoplana differing little from the Australian specimens which I 

 have referred to L. amtralis. The tentacular groups of eyes are denser owing to the 

 larger size of the individual eyes, but in other respects there is a close correspondence. 

 In one of the specimens (frojn Kaikoura) the penial stylet, instead of tapering to a 

 fine point, ends in a truncated extremity provided with a circlet of hook-like processes ; 

 and in another (from Auckland Harbour) it is nearly straight and relatively short. But 

 such differences are probably merely individual variations. 



Of the identity of this common Australian species with Laidlaw's Leptoplana 

 australis ( 1 1 ) I have no great doubt, though the description given is not very full. 

 The arrangement of the eyes agrees fairly well ; and the reference to the " long nearly 

 straight stylet " of the penis, to the prostate divided into some six or seven longitudinal 

 chambers, as well as the allusion to L. alcinoi as an allied species, all seem to point 

 to this determination. The colour given, dark chocolate-brown, is unusual. 



The British Museum specimens described by Laidlaw were collected in Port Phillip 

 by Dr. B. Lendenfeld. 



It is a somewhat remarkable fact that Plehn (i8) records the occurrence in French 

 Pass (northern Kew Zealand), and also in the Chatham Islands, of a species of 

 Leptoplana wliich corresponds in many respects with L. australis, but which has only 

 one genital aperture, like that author's L. calif ornica (19), and is not regarded by her 

 as distinct from the latter species. In the hope of finding something corresponding to 

 this, I have looked over my Australian, Tasmanian, and New Zealand specimens set 

 down as L. australis ; but they all have the two separate apertures, and I have as yet 

 seen nothing corresponding with Plehn's species. 



MiCEOCELIS SCHAUINSLANDI, Plehn (l8). 



A. solitary specimen which I obtained at St. Helens, on the east coast of Tasmania, 

 resembles Plehn's (18) species (also from Tasmania) in such points as are capable of 

 being made out. It has the same general very characteristic arrangement of the eyes 

 and posterior position of the pharynx, but the specimen was damaged and little can 

 be made of the reproductive apparatus. It was observed to be, like Cryptocelis, an 

 exceedingly sluggish form of unusually firm consistency. Its colour on the upper 

 surface was brown, veiy distinctly mottled. 



Besembling the above in the posterior position of the pharynx, the marginal eyes, 

 the two separate but closely approximated reproductive apertures, and the presence of 

 a median receptaculum seminis, is a New Zealand Polyclad which I have found under 



