164 ANNELIDA POLYCHAETA. 



arrangement of the paragnathi quite agrees with Clapa- 

 rède's description ami figure. As in other epitocous forms 

 the eyes are very large; the tentacular cirri appear to be 

 somewhat longer than indicated by Claparède , at least the 

 longest of the superior pair of them extends rather far 

 beyond the tip of the palpi, and reversed they reach the 

 5th segment. The ligules of the anterior feet are not so 

 acute as figured by Claparède , but have a more obtuse 

 tip. Only homogomph setose bristles are present. 



At the 20th segment commences the remarkable change 

 in regard to the structure of the feet. The superior ligule 

 has its base greatly enlarged and bears near the origin of 

 the dorsal cirrus an oblong oval lamella; moreover a small 

 narrow lamella occurs at its ventral side. The anterior lip 

 of the dorsal setigerous lobe is largely produced and bears 

 near its base at the ventral side a small oval lamella. The 

 inferior lobe is furnished with a large lamella, at the dor- 

 sal side extending along its total length , at the ventral 

 side embracing only its distal end. The inferior ligule is 

 faintly curved in a hook-like manner, with an obtuse papilla 

 near its base. The ventral cirrus is provided at its superior 

 margin with two small tongue-shaped lamellae , at its inferior 

 border with an oblong oval one. At one third of the length 

 of the body the superior ligule of the feet commences to 

 elongate gradually , attaining posteriorly that considerable 

 size, which is described and figured by Claparède; at the 

 same time the lamelliform processes of the feet decrease, 

 first those of the dorsal ligule, then those of the seti- 

 gerous lobes and finally those of the ventral cirrus. Carus 1 ) 

 seems to have been mistaken in placing this species in 

 Ehlers' group I: »Lingula superior simplex, non foliacea, 

 cirrum dorsalem non gerens." 



Nereis Oliv>eivue , n. sp. (PI. 7, figs. 1 — 5). 

 Length of the body 8 — 10 cm., its breadth at the widest 



1) Prodromus Faunae mediterraneae, p. 218. 



Notes from the Leyden Museum, Vol. XI. 



