142 DR. C. CHILTON UN THE 



recent years by M. Adrien DoUfus, but all the New Zealand species appear to be 

 referable to ArniacUlliclmm and Armadillo. 



Genus 1. Armadillidium, Brandt, 1830. 



Armadillidium, Budde-Lund, Isopoda Terrestria, p. 49 (1885). 



ArmadillirUum, Dollfas, Feuille des Jeunes Naturalistes, iii" Serie, 1" Mai 1892, No, 259 (1892). 



ArmadilUdhim, Sars, Crustacea of Norway, ii. p. 188 (1899). 



Genen'f! Charactet^fi. — " Body oblong or elliptical in form, very convex, and capable of 

 being rolled up into a perfect ball. Cephalon with the front distinctly niarginate, 

 latei'al lobes rounded and sharply defined at the base. Epistome vertical, forming above 

 a triangular shield, advancing more or less beyond the frontal edge. Side-plates of 

 first segment of mesosome large, securiform, not incised behind. Metasome. semi- 

 circular, with the edges continuous throughout ; last segment lamellar, quadrangular or 

 triangular in form, not extending beyond the limits of the epimeral plati s of the 

 penultimate segment. Eyes distinct, lateral. Antennuhe with the terminal joint but 

 little produced. Antennae, as a rule, not attaining half the length of the body, penulti- 

 mate peduncular joint scarcely longer than the second ; fiagellum biarticulate. Opercular 

 plates of only the first two pairs of pleopoda with air-cavities. Uropoda very short, 

 with the basal part broad, lamellar, outer ramus spatulate, inner naiTow, cylindric." 

 (Sars.) 



1. Armadillidium vulgare, Latr. 



Armadillo vulgaris, Latreille, Hist. Crust, vol. vii. p. 48. 



Armadillo vidguris, Bate & Westwood, Brit. Sess.-eyed Crust, ii. p. 492 (1868). 



Armadillidium vulgare, Budde-Luod, Isopoda Terrestria, p. 66 (1885). 



Armadillidium vulgare, DoUfus, Feuille des Jeuues Naturalistes, iii"" Serie, No. 259 (l" Mai 1892). 



Armadillidium vulgare, Sars, Crustacea of Norway, ii. p. 189 (1899). 



Specific Characters. — " Body oblong-oval, more than twice as long as it is broad, 

 side-contours sub-parallel, dorsal face strongly vaulted and ^Jerfectly smooth. Cephalon, 

 seen dorsally, broadly quadrangular, transversely truncated in front, lateral lobes 

 comparatively small, rounded. Side-plates of first segment of mesosome with the 

 posterior corner acute. Metasome broad, semicircular, scarcely occupying more than 

 one-fifth of the length of the body ; last segment much shorter than it is broad at the 

 base, and slightly tapering distally, tip transversely truncated. Antenute very short, 

 scarcely exceeding in length one-quarter of the body ; fiagellum about the length of the 

 last peduncular joint, and having its first articulation somewhat shorter than the second. 

 Last pair of legs with the ischial joint rather large, equalling in length the succeeding 

 part of the leg. Copulative appendages of the first pair of pleopoda in male with the 

 tips slightly divergent ; opercular plate of the second pair rather produced, but scarcely 

 curving outwards at the tip. Uropoda with the outer ramus much shorter than the 

 basal part, and very broad, its distal edge being continuous with the last segment. 

 Colour of distal face somewhat variable, sometimes uniformly dark grey or nearly black, 

 sometimes variegated with lighter patches, generally arranged on the mesosome in three 

 longitudinal rows, one median and two lateral; between them, moreover, on each 



