POLYCH^TA BENHAM. 65 



locality. 



Commonwealth Bay, Station 12, 110 fathoms. 



Remarks. It agrees with Eulalia magalha:nsis Kinberg, in the form of the head 

 and in the position of the median tentacle ; but differs from it in the arrange- 

 ment and length of the tentacular cirri, in the shape of the dorsal cirri and 

 of the parapods, and especially in the form of the chaetse. The marked 

 ungulation of the articular cup recalls that figured by Ehlers (1904, pi. II, 

 fig. 9), for E. microphytta Schmarda, from New Zealand, in which, however, 

 it is much less pronounced, and which differs in other respects of course. 



EULALIA (PTEROCIRRUS) MCLEANI,* sp. noo. 

 (Plate 7, figs. 52-57.) 



Two specimens in the collection appear to be new. The one studied in detail 

 measures 45 mm. in length, with 115 segments. The breadth of the body, which is 

 equal to the length of six segments, is 2-25 mm., and over the parapods 4 mm. The 

 peristomium is 1-5 mm. across, and the body gradually widens till at about one-quarter 

 of the body length it attains 2-25 mm. in width ; this is retained for about another 

 quarter, when the body commences to taper. 



In the second individual the pharynx is everted, and the body is a good deal 

 contracted anteriorly; this contains 120 segments with a small regenerated region. 

 Its length is 32 mm., its greatest width 4-25 mm. 



The colour of the body is a uniform pale brown with a dull greenish-yellow cirri, 

 which when pressed back over the body reach nearly to the middle line. Those of the 

 anterior segments are not much smaller than the rest, which are practically uniform in 

 size. 



The prostomium (fig. 53) is broader than long, trefoil shaped with a slight notch 

 posteriorly. The eyes are large, and separated from one another by a space rather 

 greater than their diameter. The median tentacle arises far back, between the eyes, 

 and is thus close to the hinder margin ; it is a good deal longer than the prostomium. 

 The lateral tentacles arise in the usual position ; they have the shape of a long cone, 

 constricted at the base with the apex produced to a point. 



The tentacles and cirri are quite pale, and possibly are yellowish in life. 



The first and second segments are distinct dorsally, the longest tentacular cirrus 

 reaches to the 14th segment, the other three are about half this length. The three upper 

 cirri are circular in section, but the ventral cirrus of the second segment is flattened 

 from in front backwards, higher than it is thick, so as to be foliaceous. Its apex is 

 produced into a longish filament. 



* I wish to associate with this animal the name of Dr. A. L.McLean, who did such useful service in collecting at winter 

 quarters. 



