planer’s lamprey. 
403 
from a row of tendrils which encompasses the mouth, but- this 
requires explanation. In the Lampern, as we have represented 
it, there is a border at the same place of very numerous hut 
slender threads; but in our examples of Planer’s Lamprey there 
was only a single row, and each filament was wide at the base. 
!i 
ending in a point; the surface red, hut of a deeper colour 
along the middle of the length; and it is remarhable that soon 
after death these filaments were scarcely or not at all to he 
discerned. The armature of this species bears a resemblance 
to that ot the Lampern and Silver Lamprey; a row of very 
small teeth round the lower portion of the entrance of the 
gullet; two larger teeth above, separate, and another of about 
equal size outward from each of these; below them on each 
side a pair, and below them again, neaily on a level with the 
first-named row, another pair on each side. 
