REPORT ON THE NEMERTEA. 13 



303-308 right, as well as 448-485 left and 450-485 right) being unmistakably opposite. 

 The duplicity of these deferent ductules, as figured on PI. VII. fig. 5, is the exception ; it 

 was only noticed in this one case, all the other ductules being single. 



As to the generative caeca I find in this specimen (which is a male) that they are 

 very full, and that dorsally and ventrally they assume a conspicuously lobed and arbor- 

 escent appearance. 



The integument ofi"ers many points of interest which will not be detailed here as they 

 will be more fuUy described in the paragraph devoted to it. 



Eupolia australis, n. sp. (PL I. fig. 6 ; PI. VII. figs. 1-3, 7). 



From M'Intosh's notes on this specimen I copy the following : — 



"Another type of a whitish colour, measuring about 19 mm. in length and about 

 2 mm. in its widest part in front. The body is tapered from the wide anterior region to 

 the fractured posterior end. It is rounded in front, somewhat flattened towards the pos- 

 terior region. The head having been retracted forms a short blunt cone projecting from 

 the folds of the wider nuchal region. No trace of furrows exists, but the mouth seems 



to be at the bottom of the transverse dimple at the base ventrally The inner 



longitudinal (muscular) layer is peculiar, for its fibres are somewhat regularly arranged, 

 in long, parallel, and occasionally pennate fasciculi, which in transverse section run 

 inward from the former coat. There is a slight hiatus in the dorsal middle line above the 



proboscidian sheath The proboscidian canal is somewhat thin 



The specimen is a male and the sperm-cells form large masses." 



The sections showed that the species was distinct from Eupolia giavdii, which comes 

 from the same locality, as also from the Japanese Eupolia nipponensis, which will be 

 described below. They furnish the following data which it may be of use to recapitulate, 

 in order to facilitate identification of the species when it is again captured in the same 

 waters, and may then be described with its external coloration, of which no indication can 

 here be given. 



The primary difference between every section of Eupolia australis and all the other 

 species of Eupolia here described is found in its integument. That portion of the integu- 

 ment which lies outside of the secondary basement membrane, B (PI. VII. figs. 1-3), is 

 by far the most prominent and the thickest portion, whereas in the other Eupolise it 

 attains only half or even less of the thickness of the whole integumentary layers that are 

 found outside the primary basement layer. Bet (PL VII. figs. 5, 9). In correspondence 

 with this the secondary basement membrane is much thinner in these latter species than 

 it is in Eupolia australis. 



The regidar distribution of the blood-spaces round the oesophagus, and just behind it, 

 is such that in addition to the medio-dorsal and the two ventral blood-vessels (6r) it 



