14 DR J. STEPHENSON ON 
observers); breadth 4mm. Slow-moving: placed in a vessel of water, slowly uncoils 
and extends itself as a long strip round the sides of the vessel at the level of the surface 
of the water; the tail tends to curl in a corkscrew fashion. 
Colour of the dorsal surface brown, with often a tinge of purple; on examination 
with a lens, the colour appears as a dark brown mottling on a lighter ground. Head 
slightly lighter in tint; under surface light greyish, with darker bands one on each 
side of the middle line; the intestine is seen on the ventral surface as a pale yellow 
line giving off branching diverticula. 
Head not expanded, not marked off from the body ; tail slightly tapering. 
Cephalic grooves small, oblique, on the under surface of the head near the tip, 
approaching one another at their anterior ends. 
Eyes very numerous, small, in two groups on each side, a more numerous anterior 
and less numerous posterior; on focussing, they appear some distance beneath the 
surface, and the examination of sections shows them to be beneath the epithelial 
layer. | 
The head glands are well developed, and there are also, as noted in the specific 
diagnosis in the Tverreich, a large number of subepithelial gland-cells in the head. It 
may be added that gland-cells extend continuously for some distance along the body, 
aggregated in two rows, one along each side; the masses are very conspicuous to the 
naked eye in a series of sections, since they stain deeply (with hematoxylin), and are of 
considerable size; they displace the longitudinal muscle layer, and impinge on or even 
surround the nerve cord. The gland-cells of the head, as they are traced backwards in 
serial sections, leave first the mid-dorsal area, then the mid-ventral, and so come to be 
aggregated in the two lateral rows described above. 
The cerebral organs and the anterior diverticula of the alimentary canal agree with 
previous descriptions. I have not, however, seen any statement as to the number of 
proboscis nerves ; there are definitely twelve in one of my specimens; but the number 
of nervous tracts differentiated in the nervous sheath perhaps varies, since in another 
specimen the nerves themselves appear to be less definite, and their number seems to be 
greater (fourteen or sixteen). 
With regard to the coloration of this form, there is a general agreement in the 
descriptions to which I have been able to refer; and to these my specimens also 
conform. The descriptions of the cephalic grooves by MacInrosH and Jovusin differ 
slightly, and the account given above accords rather with that of MacInrosu. The 
same may be said with regard to the eyes; Jousrn figures them as aggregated on each 
side into a large group of curious shape, extending farther back than in the Scotch 
examples, and not separated into two groups on each side. The length of my specimens 
(2 to 4 feet) is to be compared with the figures given by MacIntosu (4 to 18 inches) 
and by Burexr in the Tierreich (up to 460 mm.=18 inches), as well as by JouBrn 
(8) (50-60 em. = 20-25 inches). 
