TEREESTKIAL ISOPODA OF NEW ZEALAND. 146 



would require to establish at least four or five new species for its members, and I shrink 

 from such an undertaking. 



In specimens that I look upon as typical forms tlie whole surface of the head and 

 body is smooth, the ridge along the front of the eephalon is not very prominent, 

 especially in the centre, the end of the last segment is nearly straight (corners rounded) 

 and with indication of a slight emargination in the centre, and the " tooth " on the 

 inner side of the lateral margin of the first segment, and the small tubercle on that of 

 the second, are fairly distinct. I have some specimens from Greymouth, where the 

 ridge along anterior border of head is much move pronounced, the "tooth" and 

 " tubercle " less evident, end of last segment slightly rounded with no indication of 

 emargination ; the surface of the head, moreover, presents some slight irregularities, and 

 there are a few indistinct wavy elevations on the sides of the median line of the bodv • 

 the central part of the last segment is a little raised, though hardly sufficient to be 

 called ridged, and the basal portion of the last segment, and the epimeral portions of the 

 third to fifth segments of the metasome, are rather broader than in the type. 



Two specimens from Wauganui in Mr. Thomson's collection agree with these Grey- 

 mouth specimens in the ridge on the anterior margin of eephalon, and in the " tooth and 

 tubercle," but the epimeral portions of metasome and the basal portion of the uropoda 

 are fully as narrow as in the typical specimens ; the end of last segment is quite squarely 

 truncate, and the whole body is nearly smooth. In these two specimens the inner 

 branch of the uropoda is shorter than in any other I have seen. 



Specimens from other localities show other combinations of these various characters, 

 and on the whole I think it wisest to consider them all as belonging to one species. 



2. Akmadillo Dan^, Heller. 



Splierillo dana, Holler, Reise der Novara, p. 134, pi. xii. fig. 4 (1865). 



Armadillo inconspkuus, Miers, Ann. & Mag. Nat. Hist. ser. 4, xvii. p. 22a (187(i); Cat. N. Z. Crust. 



p. 95, pi. ii. fig. 4 (1876). 

 SpheriUo dancs et Armadillu inconspicuus , Thomson & Chilton, Trans. N. Z. lust. .wiii. p. J5'J (1880). 

 Armadillo dame, Butlde-Lund, Isopoda Terrestria, p. 39 (1885). 

 Armadillo inconspicuus, Budde-Luud, /. c. p. 39 (1885). 

 Armadillo inconspicuus, Filhol, Mission de I'llc Campbell, p. 439 (1885). 

 SpheriUo dance, Filhol, /. c. p. 440 (1885). 



Specific deso'ipHor/ . — In the eephalon surface and general appearance closely re- 

 sembling A. amhitiosus. Posterior border of first segment of metasome only very slightly 

 produced backwards, that of others straight. Lateral margin of first segment with a 

 narrow groove extending along its whole length, becoming shallower anteriorly, second 

 segment also with lateral margin deeply grooved. Segments of metasome short, epimeral 

 portions less elongated than in A. ambitioims, terminal segment a little broader at base 

 than at tiie extremity, end truncate, slightly rounded. 



Basal [)ortion of uropoda M'ith exposed portion small, end rounded, outer ramus 

 minute, inner ramus reaching very nearly to the end of last segment. 



Colour brownish, with lighter wavy markings on each side the median line. 



Length about 10 mm. 



