240 ART. II.— A. IZÜKA : 



Glijcera opisthobrancJiiata Marenzeller. 



PI. XXIV, figs. 3—4. 



1879. Glycera opistliolDrancliiata, Marenzeller. Südiap. Amiel., p. 31, 

 Taf. VI, Fig. 2. 



Body consisting of 250 — 290 parapodiated segments, tapering 

 toward both ends ; length 200 — 235 mm. ; breadth in t]ie middle 

 region of body 5 — 6 mm. exclnding parapodia. Segments bi- 

 annnlated. A longitudinal shallow groove is found on both dorsal 

 and ventral surfaces of body. Colour reddish-dark-gray, the 

 median part of the ventral surface being lighter in colour. 



Prostomium 11-annulated, nearly so broad as long; the 

 first six annuli being equal in length to one another. Palpi 

 inconspicuous. 



Parapodia of the two anteriormost pairsl ack dorsal cirrus. 

 The third parapodium and all behind it are similar in structure. 

 Typical parapodium (fig. 3) very short and blunt, a little longer 

 than high ; posteriorly situated parapodia somewhat longer than 

 anterior ones. The two anterior ligulœ in typical parapodium 

 conical with blunt end, separated from each other by a deep 

 notch, the superior slightly longer than the inferior, and both also 

 longer than the two posterior ligula3 which are separated from each 

 other by a shallow notch. Dorsal ramus of parapodium with simple 

 bristles ; ventral ramus with articulated bristles (fig. 4), of which 

 the blade is finely serrated. Dorsal cirrus arising from base of 

 parapodium, short and cylindrical in form, with rounded end. 

 Ventral cirrus arising from middle of the ventral border of 

 parapodium, large, its end scarcely reaching to middle of the 

 ventral border of posterior inferior hgula. 



