N I S C I D E A. 731 



Oniscus? angustus. 



Corpus angustum, Iceve. Caput prominens, processubus antero-lateralibus 

 non exsertis, f route paulo arcuato. Abdomen thorace subito paulo 

 angustius, lateribus rectis et integris, segmentis latere non salientibus, 

 ultimo breviter transverso, triangulato. 



Body narrow, smooth. Head not embedded in following joint, but 

 prominent, the antero-lateral processes absent, and front a little 

 arcuate. Abdomen abruptly a little narrower than thorax, sides 

 straight and entire, the segments not being salient either side ; last 

 segment short transverse, triangular. 



Plate 48, fig. 3 a, animal, enlarged ; b, outer maxilliped ; c, first 

 pair of legs ; d, extremity of last pair. 



Near Nassau Bay, Tierra del Fuego. 



Length, four lines. The antennae and stylets are both wanting in 

 our specimens, and the subgenus to which they belong is, therefore, 

 undetermined. The habit of the body is somewhat like that of a 

 Styloniscus; but the character of the maxillipeds shows that they 

 are not related to that group. The fifth joint of the last pair of 

 legs is very slender, and the short setae on the under side are not 

 longer than the breadth of the joint ; the fourth joint of the first 

 pair bears below a few long, slender spines, longer than half the 

 next joint; the fifth joint is very nearly naked. 



Oniscus? maculatus. 



Caput suborbiculare, fronte arcuatum, processubus antero-lateralibus 

 8alientibus non instructum. Corpus nitidum, non granulatum. teg- 

 menta thoracis 5 antica fere recti transversa. Abdomen thorace subito 

 multo angustius, vix longius quam latum, lateribus integris et rectis (seg- 

 mentis utrinque non salientibus) , segmento ultimo valde transverso, mar- 

 ginepostico laid triangulato, stylis abdomine parce brevioribus, ramis am- 



