18 DR J. STEPHENSON ON 
There are two reserve sacs, the numbers of reserve stylets found in these were six, 
seven, eight, or nine. 
Here, again, MacInrosn’s figure (his pl. xii. fig. 6) shows a close agreement with 
the above description. Birarr, however, appears to have been dealing with a very 
different shape of pedestal; compare the latter author’s plate (3), and also his statement 
that the basis “ist kegelférmig und hinten etwas kuglig angeschwollen.” A similar 
statement is made part of the specific description in the Tverreich. Students of the 
Nemertini will for ever be indebted to BUrcgr’s comprehensive and masterly work ; 
but if a criticism may with all respect be ventured, I would suggest that he has relied 
too much on his own specimens for the construction of specific diagnoses, and has not 
allowed enough weight to the descriptions of previous authors, nor considered sufficiently 
the great variability of many species of the class. 
With regard to certain other specific characters given in the Zierreich, the cecum 
in my specimens corresponds to what is there stated; the cerebral organs, stated to lie 
behind the brain, | find to be for the most part alongside and almost coextensive antero- 
posteriorly with the brain, though they extend backwards for some little distance be- 
hind it; the number of proboscis nerves, however, is different—BwUrcER giving ten, 
while I find twelve. 
Amphiporus elongatus, n. sp. (fig. 12). 
A single specimen ; found on Fairlie sands. 
Length, 3 inches ; filiform, breadth when extended being less than 1 mm. ; tapering 
markedly towards the head, which is flattened ; the tail blunter than the head. 
Colour bright yellow, becoming an orange yellow when contracted; the margins 
lighter, the ventral surface of the same colour as the dorsal. 
The head was flattened, tapering, and not marked off from the body; the ganglia 
were visible as reddish masses. The eyes were five in number (v. fig. 18)—two smaller 
ones, one on each side near the tip of the snout, and three larger ones, two on one side, 
and one on the other, over the cerebral organs; there was a considerable interval 
between the two sets. 
The cephalic grooves were two on each side (v. fig. 18), the anterior very oblique, 
leading backwards on the dorsal surface from the lateral margin to the cerebral organ ; 
the posterior also leading obliquely backwards almost parallel to the anterior pair, and 
nearly meeting in the middle line at the level of the anterior end of the brain. Both 
sets of grooves were continued round the margins on to the ventral surface in the same 
direction, 7.e. running from the lateral margin forwards and inwards towards the middle 
line. 
The cerebral organs were large, and situated quite in front of the brain (v. fig. 13). 
The proboscis sheath was continued to within a very short distance of the hinder 
end. The stylet was rather thick as compared with its length, and shorter than its 
pedestal; the shape of the latter was roughly cylindrical, with rounded ends, very 
