ANNELIDA POLYCHAËTA. 171 



ledge of the characters of N. taorica is rather scanty, but 

 this species seems to be characterized by having at the 

 ventral side of the basal region of the proboscis only a 

 single series of few paragnathi. Our species more nearly 

 approaches N. camiguina , though the arrangement of its 

 paragnathi is somewhat different , the structure of the feet 

 is also somewhat doubtful, as we have no figure of them. 

 Grube seems to have known only the atocous form, perhaps 

 our specimens might be the epitocous form of this species. 



Nereis niyro-punctatti , n. sp. (PI. 8, figs. 1 — 3). 



Epitocous form. The body of the largest specimen 

 measures 27 mm. in length; the number of its segments 

 amounts to 70. Cephalic lobe trapezoidal, with the poste- 

 rior margin truncated, not quite so long as broad; eyes 

 large, situated next each other. Antennae having a third 

 of the length of the head; palpi about twice as long as 

 the antennae, their basal portion in the middle with an 

 annular groove. The antero-posterior diameter of the buc- 

 cal segment only slightly more than that of the succeed- 

 ing ring; the inferior pair of the tentacular cirri about 

 as long as the palpi, the longest of the superior pair reach- 

 ing to the posterior border of the 4th segment or beyond. 

 Segments in the anterior body- region on each side of the 

 dorsum marked by a transverse blackish spot, posteriorly 

 only with a dot of the same colour; head generally also 

 marbled with blackish. 



The change of the feet commences in the males at the 

 16th segment, in the females at the 19th ring. At the 

 feet of the anterior body-region the lip of the dorsal seti- 

 gerous lobe has a rounded border, divided by a deep notch 

 in a small superior and a larger inferior half; the ventral 

 lobe is shorter, reaching about to the middle of the in- 

 ferior edge of the dorsal lobe. The superior ligule is bluntly 

 triangular, nearly of the same length as the dorsal lobe; 

 the inferior ligule projects till the tip of the ventral lobe. 

 Dorsal cirrus almost twice as long as the superior ligule, 



.Notes from the Leyden Museum, Vol. XI. 



