242 Transactions. — Zoology. 



Segments, 70-90 ; elytra, 35-45 pairs, borne on segments 

 2, 4, 5, 7, 9 and all subsequent odd segments. 



Anus dorsal. 



Prostomium embedded in tbe peristomium, urn-shaped, 

 broadest between the eyes, slightly longer than broad, pro- 

 duced anteriorly into the bases of the lateral tentacles, 

 between which the base of the median tentacle is wedged. 



Eyes, two pairs, quite sessile and quite lateral, situated 

 nearly at the point of greatest diameter. Median tentacle 

 longer than the lateral ones, and longer than the prostomium. 

 Palps about three times as long as the prostomium, stout at 

 the base and tapering continuously to the tips, studded all 

 over with minute spines. 



Parapodia stout, conical, almost uniramous ; dorsal chsetas 

 few and extremely small, accompanied by a stout aciculum, 

 tapering, serrated on each side, and ending in a fine needle- 

 like tip. Ventral chsetae also few, but longer, fairly stout, and 

 slightly hooked at the tip, which is blunt ; provided with two 

 asymmetrical spines on the dorsal surface, followed by two 

 rows of four or five " combs " on each side. 



Nephridial papillae distinct, cylindrical, slightly fluted, 

 beginning at the 10th or 11th segment and continuing to the 

 penultimate segment ; rendered conspicuous by segmental 

 pigment patches near their bases. 



Elytra subcircular ; margin entire ; surface smooth, ex- 

 cept for a very few small tubercles on the first two or three 

 pairs ; pigment in the shape of a broad dark comma on the 

 mediad moiety of the elytron. The first four or five pairs 

 have a patch of russet-brown pigment on the convex shoulder 

 of the comma-shaped mark ; the first elytron is colourless but 

 for this russet patch. The elytra of a side do not overlap in 

 the hinder region of the body, but anteriorly they do. Only 

 the first three or four pairs meet across the back. The rest of 

 the back, being uncovered, exhibits dorsal bars of pigment at 

 the back of each segment, which, well marked in front, vanish 

 in the posterior region. 



The ventral surface has a median and two lateral bands 

 of dark pigment. 



The worm was collected at Moeraki by Dr. Benham, of the 

 Otago Museum, and all the specimens were found to be com- 

 mensal with a Terebellid. 



