432 A HISTORY OF RECENT CRUSTACEA 
ably produced with a short outer branch. The three 
species described by Budde-Lund are from Peru. 
Budde-Lund mentions Acanthoniscus spiniger, White, 
from Jamaica, and Ouracherus caudatus, White, of un- 
known habitat, but confesses himself unable to determine 
their position among the Onisci. 
Stenoniscus, Aubert and Dollfus, 1890, does not fall into 
any of the groups established or recognised by Budde-Lund. 
It has a very narrow, hairy body, the hind margin in the 
front segments of the perzeon not sinuous, and but little in 
the hinder ones, the side-plates distinct in all but the first 
segment; the first segment of the pleon not visible, the 
others dorsally tubercled, the large rounded terminal seg- 
ment completely covering the uropods, which have a broad 
short peduncle, the outer branch apical, minute, the mner 
longer than the outer, attached high up on the peduncle. 
The second antennez are very short, with a two-jointed 
flagellum. The single species is Stenoniscus pleonalis, 
Aubert and Dollfus, from the sea-coast, Marseilles. 
Family 5.—Armadillidide. 
The body is very convex, contractile into a globular 
form. The head is sometimes broader than long, flanked 
by the first segment of the perzeon; the face is nearly 
perpendicular. There is no demarcation of the sides of 
the head. The clypeus is perpendicular. The young quit 
the mother with all seven segments of the perzon 
developed. Thetrunk-feet are rather short. The uropods 
are short, flattened, not reaching beyond the postero-lateral 
points of the two terminal segments of the pleon. The 
foregoing characters distinguish this family from the 
Oniscide, the other characters of which are common to both 
families and need not be repeated. 
Of the generic names in this family the nearest in age 
to the preoccupied Armadillo are Cubaris and Armadilli- 
dium. Of these two, which are contemporaries, it seemed 
reasonable and convenient, for the sake of old association, 
to give the preference to Armadillidium in forming the 
name of the family. 
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