40 Aiuielida Chcetopoda 
Amphiro may be a young form of Marphysa or of some 
related geiius. 
DRn.ONEREIS {ClpcL). Char, emend. 
Feet uniraraous, setse simple, no ventral or dorsal cirri; 
lower jaw pieces present, absent, or rudimentary. Upper 
jaw, on each side, four pieces similar to those on the 
opposite side, in addition to the support. 
Claparede (1. c.) gives as a characteristic of his genus 
Drilonereis: "Labrum nuUnm." The following species 
seems to belong to this genus, but it may have two pieces 
in its lower jaw, or one with the rudiment of the other; 
or one alone, or finally none at all. 
Driloneris longa n. sp. 
PL. VII, FIGS. 84-88. 
Head, in the living animal, variable in dimensions; 
conical, round above, flattened below, bluntly rounded in 
front. 
First two segments equal in length; no appendages. 
Feet, on first 30-40 segments, consist of a low rounded 
elevation, from the Summit of which project a few simple, 
bordered setae, and one stout acicula. Next appears a 
minute papilla projecting from the lower back part of the 
foot; it gradually becomes longer, and extends beyond the 
foot (f. 84). Meantime the foot itself becomes longer and 
cylindrical. The posterior lip, which, when it first appears, 
is about at the outer third of the foot, moves outward, and 
becomes terminal. Next a papilla appears on the anterior 
margin of the foot, which gradually elongates and becomes 
in every respect similar to the posterior lip. These two 
lips diverge from each other, and between them is the 
rounded endof the foot from which the setse project (f. 86). 
These changes take place very gradually, the feet repre- 
