240 



Armelida Ghcetopoda 



Amphiro may be a young form of Marphysa or of some 

 related geiius. 



DRn.ONEREIS {ClpcL). Char, emend. 



Feet uiiiramous, 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: "Labrura nuUiim." 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, PIGS. 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. l^ext 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. !N'ext 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 end of the foot from which the setae project (f. 86). 

 These changes take place very gradually, the feet repre- 



