148 DR. C. CHILTON ON THE 



tliey may even give the appearance of a poorly-marked transverse row of small tubercles 

 on the segments of the metasome ; it is perhaps sijecimens of this kind that Heller 

 described under the name Spherillo monolinus, but as he says nothing about the notches 

 on the inferior margins of the first two segments of the metasome, I do not feel 

 justitied in definitely identifying our species with liis. 



5. Armadillo monolinus, Dana, 1853. 



Spherillo monolinus, Dana, U. S. Explor. Exped., Crust, ii. p. 719, pi. 47, fig. 3 (1853). 

 Spherillo monolinus, Heller, Voy. Novara, Crust, p. 135 (18G5). 

 Armadillo Aucklundicus, Budde-Luiid, Isopoda Terrestria, p. 40 (1885). 



I have seen no specimens that I could refer to this species. Dana describes it as 

 follows : — 



" Head arcuate in front. Segments of thorax transversely marked with a beaded 

 ridge and laterally truncate, anterior segment longest and marked with two beaded 

 ridges. Abdomen semicircular, third, fourth, and fifth segments laterally obtuse, tlie 

 last with a nearly subquadrate apex, and much broader at base. Caudal appendages 

 subtriangular, shorter than breadth at base, inner margin broadly excavate. Antennae 

 nearly naked, flagellum hardly shorter than preceding joint. Length 4 lines." 



Dana's specimens were obtained at " Wykare River, near Bay of Islands." 



Heller describes a specimen from Auckland, and at the end of bis description says: 

 " I denote this species as ^S*. monolinus" without making it clear whether he is referring 

 it to Dana's species or giving it as a new species, using by inadvertence the same name. 

 Budde-Lund supposes Heller's species to be new, and therefore changes the name to 

 Aucklandicus. I tliink, however, that it is more likely that Heller intended to refer his 

 specimen to Dana's species, and there is nothing in his description inconsistent with this 

 supposition ; Miers had evidently taken this to be Heller's intention, but curiously 

 enough he docs not give the reference to Heller's descrij)tion, though he quotes it 

 for the habitat when describing Spherillo monolinns, Dana. It is possible that this 

 species may be the same as A. I'/if/idosws, Miers. 



6. Armadillo Hamiltoni, sp. nov. 



" Remarkably sculptured Terrestrial Isopod." — G. M. Thompson, Annals & Mag. N. H. ser. 6, xii. 

 p. 225, pi. iv. 



Specific description. — Oblong-oval, breadth rather more than half the length, epimeral 

 portions greatly developed and projecting downwards and outwards, central part greatly 

 raised above the epimera and richly supplied with spines and crests. Cephaloa with the 

 dorsal surface produced forwards into a thin jilate ))rojecting far over the bases of the 

 antcnnte ; from the dorsal surface of the ceplialon arise two transverse lateral crests or 

 flanges, which project horizontally forwards as far as the central prolongation of the 

 vertex ; the posterior margin of the cephalon is curved upwards, and a little exterior to 

 the median line is produced upwards into a conical tooth ; the posterior margins of 

 each segment of the mesosome is similarly produced upwards and somewhat backwards 

 into two teeth, those on the seventh segment being very large and prominent ; the first 



