REPORT ON THE NEMERTEA. 11 



my own part, when giving my critical revision of Nemertean genera and species (VII.), 

 to retain the name Polia in that list, although I was aware of its inapplicability according 

 to the accepted rules of nomenclature. I retain delle Chiaje's Polia delineata as the 

 type species for Eupolia. 



Eupolia delineata, (delle Chiaje) Hubrecht (PL VII. figs. 9, 10). 



This species, which is very common in the Mediterranean, more especially at Naples, 

 is represented in the Challenger collection by one fragmentary specimen, captured at St. 

 Vincent, one of the Cape Verde Islands. The fragments showed no head, but the 

 characteristic colouring of the specimen by thin brown stripes on a lighter brown back- 

 ground, was still so distinct in the spirit specimen, that even in the absence of a head, I 

 do not hesitate to identify this form with the above-mentioned species, especially after com- 

 paring the sections through the fragments with those through Mediterranean specimens. 



In one of the fragments, which is the tail, a terminal commissure between the two 

 nerve-trunks can be demonstrated ; by a curious twisting of the fragment the sections 

 seem to prove this commissure to lie above the intestine. Such a commissure is 

 found in other species of Nemertea (e.g. Amphiporus, Drepanophorus), but a close 

 inspection soon reveals that here, and also in other Eupolise, the posterior commissure is 

 indeed found below the posterior portion of the intestine instead of above it. 



In MTntosh's preliminary notes on the Challenger Nemertea, I find a notice made 

 of this specimen to the following effect : — " The specimen is incomplete, neither head nor 

 tail being present. The body is firm and rounded, measuring about 45 mm. in length 

 and about 8 mm. in diameter at the wider part anteriorly The body is closely 

 striated longitudinally, dorsally, and ventrally by alternate white and brownish belts, the 

 pigment constituting the latter being situated on the inner side of the basement layer of 

 the cutis, which forms a simple stratum." 



Eupolia giardii, (M'Intosh) Hubrecht (PI. I. figs. 7-9; PL V.; PL VI. figs. 4-11 ; 

 PL VII. figs. 4, 5, 8 ; PL X. fig. 6 ; PL XL fig. 12). 

 Euborlcuiia giardii, M'Intosh, in lift. 



This new species, which shows interesting peculiarities, is represented by one 

 specimen, which was cut up into different portions when I first examined it, so that I 

 can only give a sketch of the head but no figure of the animal in toto. 



A well-marked peculiarity of this species of Eupolia is its shortness, which even 

 surpasses that of Eupolia curta from Naples. 



The head shows (see PL I. figs. 7-9) a faint annular constriction, not continuous in 

 the median ventral line. In this constriction the right and left external openings 

 leading into the posterior brain-lobe are situated. Judging from what we find in other 



