432 A HISTORY OF EECENT CRUSTACEA 



ably produced with a short outer branch. The three 

 species described by Budde-Lund are from Peru. 



Budde-Lund mentiomg Acamthoniscus spiniger, White, 

 from Jamaica, and Owrachoerus 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 perason 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 inner 

 longer than the outer, attached high up on the peduncle. 

 The second antennae are very short, with a two-jointed 

 flagellum. The single species is Stenoniscus pleoTialis, 

 Aubert and Dollfus, from the sea-coast, Marseilles. 



Fcmvily 5. — Armadillididce. 



The body is very convex, contractile into a globular 

 form. The head is sometimes broader than long, flanked^ 

 by the first segment of the perseon; 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 perseon 

 developed. The trunk-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 

 Oniscidae, 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 Cubans- 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. 



