Isopods from New Zealand. 417 



but the tubercles are found only on the male. They are very 

 characteristic, each being a well-marked denticle with four or 

 five rounded and roughened crowns. 



The female differs from the male in having the whole body, 

 except the lower antennas, more or less tuberculate. The 

 head and three posterior segments of the body bear a row of 

 tubercles on each side, and have their inferior margins laterally 

 extended. The fourth segment is flattened on its postero- 

 lateral margins ; it bears on the median line at its anterior 

 extremity a large three-pointed tubercle ; behind this are 

 three smaller tubercles placed transversely, the middle one 

 being the smallest ; and on each side of the anterior margin 

 are two tubercles, the lower of which is the largest. The 

 oviferous pouch does not extend the whole length of this 

 segment. The fifth segment of the body is extended down- 

 wards as if to form a supplementary poucli ; but I do not 

 know at all what the function of this enlargement can be. 

 Length 02 of an inch, exclusive of the antennas. 



Hah. Dredged in Dunedin Habour, in 4-5 fathoms. 



The second species described in this paper is a Tanais, of 

 which I have hitherto only obtained a single specimen, and 

 of which consequently the description is somewhat meagre. 

 It approximates rather closely to T. vittatus, Lilljeborg, of 

 Europe, and is probably its representative in these seas, 

 but at the same time is sufficiently distinct. The following 

 are the chief points of difference. The antennas are not so 

 setose. The first gnathopoda are well developed ; but the im- 

 movable finger is destitute of tubercles on its inner margin, 

 while it is much thicker than the movable finger. The 

 posterior pereiopoda are terminated by sickle-shaped fingers, 

 but wanting the denticulations which are found in T. vittatus. 

 The fascicles of hairs on the pleon are composed of rather 

 dense furry hairs, not slender cilia. Lastly the terminal 

 uropoda have rive instead of three articulations. The follow- 

 ing is the specific character: — 



Tanais novce-zealandicn , sp. nov. 



Body broader than deep, with transverse fascicles of rough 

 hairs on the three anterior segments of the pleon. Eye very 

 small, black, and circular, placed on a prominent lateral lobe 

 of the anterior margin of the head. Superior antennas three- 

 jointed, setose at the extremity ; first joint longer than the two 

 succeeding. Inferior antennas rather shorter than superior. 

 First gnathopoda very stout, the immobile finger of the hand 



Ann. & May. X. Hist. Ser. 5. Vol. iv. 30 



