476 ONISCIDA. 
Arzn. Thiere, ii. tab. 12, f. 1, 2, 8, 4. Jonnsson, 
Syn. Framst. Sver. Onise. p. 21. Zappacu, Syn. 
Crust. Pruss. p. 12. Buregrspiyx, Annot. p. 39. 
ScunirzueR, Onisc. Bonn. p. 28. 
Oniscus granulatus. Lamarck, Hist. Anim. sans Vertébr. v. p. 261. 
Porcellio dilatatus. Branpt and Rarzes., Arzn. Thiere, t. 12, f. 6. 
Braypt, Bull. Moscow, vi. p. 176. 
Oniscus asellus. Fapricius, Ent. Syst. Suppl. p. 300. 
Porcellio Brandtit. Minne Epwanrbs, Crust. iii. 168 (var.). 
Porcellio dubius. Kocu, in Cont. Panz. Heft. 180, n. 8. 
Porcellio affinis. Koon, in Cont. Panz. Heft. 180, n. 13 (var.). 
THIS species is at once distinguished by the entire 
upper surface of the animal being strongly marked with 
round and elevated tubercles. The lateral lobes of the 
head are very prominent, and rounded at the outer 
angles, whilst the central lobe is strongly produced and 
nearly triangular. The animal is more or less ovate in 
form, and moderately convex, with the posterior angles 
of the segments of the body moderately produced and 
pointed. The outer antenne have the second joint 
dilated internally at its base. The fifth joint is the 
longest, and the two terminal joints united are about 
two-thirds of the length of the fifth. The upper lip is 
formed of two flattened membranous plates, of each of 
which the outer apical angle is rounded, and the inner 
angle slightly extended, dilated, and setose. The right- 
hand division of this lip is represented in figure Jb’. The 
mandibles are horny, strongly angulated on the outside, 
the extremity being at right angles with the base, and 
armed with three teeth, which seen laterally are obliquely 
truncated. Below this, the inner margin of the mandible 
beyond the middle is armed with a complicated series of 
short horny teeth and bristles, the innermost of which is 
elongated and curved. The inner maxille are delicate, 
and armed at the tip with two setose bristles; the outer 
maxillz are large, oblong, setose on the outer edge, and 
