N I S C I D E A. 733 



referred to in the descriptions. The surface of the segments of the 

 thorax is corrugate, except a smooth medial surface, and a band 

 across adjoining the posterior margin; the articulations are nearly 

 straight across, the postero-lateral ajigles being little prolonged back- 

 ward, except for the last thoracic segment. The head is granulate. 

 The antennae have the same kind of extremity as in other Oniscinae. 

 Length, four lines. 



Subfamily SCYPHACIM1. 



This subfamily embraces two genera, as present known. Although 

 the general form of the body and structure of the caudal appendages 

 are nearly as in the Oniscinae, there is a wide difference in the outer 

 maxillipeds, the extremity consisting only of a single lamellar joint, 

 which in one genus is half as long as the preceding joint. One of the 

 genera includes species found in a sand-beach bordering the sea, while 

 the other belongs, like the Onisci, to damp places about the land, 

 remote from the sea. 



The head is not set into a concavity in the anterior thoracic seg- 

 ment, and is broad transverse, with large reniform eyes in one genus. 

 The mandibles are rather slender, without palpi. 



Genus SCYPHAX, Dana. 



Oculi grandes. Antennce pediformes, ad articulatianem 6tam nan geni- 

 culates, flagello 1—3-articulato articulis apicalibus minutis exclusis. 

 Articulus maxillipedis terminalis latus et margine lobatus. Styli can- 

 dales ac in Oniscinis. Pedes septimi valde minores, debiles. 



Eyes quite large. Antennae pediform, not geniculate at the fifth arti- 

 culation, flagellum 1-3-jointed, the minute apical excluded. Ter- 

 minal joint of maxillipeds broad and serrately lobed. Stylets as in 

 the Oniscinae. Feet of seventh pair much smaller than the others, 

 weak. 



The sides of the head are occupied by the oblong reniform eyes. The 

 antennae are eight-jointed, and bend outward at the articulation between 



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