62 



9-articulate. Mandibular palp distinctly biramous. Maxillse with the palp normally 

 developed, endopodal part somewhat produced. Anterior maxillipeds with the 

 terminal joint of moderate length, and tipped with a slender claw. Posterior 

 maxillipeds with the basal part uni- or biarticulate. First pair of legs with both 

 rami 3-articulate, terminal joint of outer ramus armed with several hook-like 

 claws of unequal size. Last pair of legs very strongly built, and extending along 

 the sides of the urosome, distal joint large, sword-shaped, and armed with strong 

 spines at the tip. 



Remarks. This genus was established in the year 1845 by Baird, to 

 include one of the 2 species described below. The 2 genera, Sterope and Carillus, 

 recorded by Goodsir, are both apparently synonymous with Baird's genus. Prof. 

 Brady erroneously referred the species of this genus to Peltidium Philippi, from 

 which the present genus is clearly distinguished both by the general aspect of 

 the body, and the structure of the several appendages. We know at present of 

 3 distinct species of this genus, 2 of which belong to the fauna of Norway. 



38. Alteutha interrupta (Goodsir). 



(PI. XXXVI & XXXVII). 

 Sterope interrupta, Goodsir, Ann. & Mag. Nat. Hist. Vol. XVI, p. 326, PI. XI, fig. 10. 



Syn: Alteutha bopyroides, Glaus. 



norvegica, Boeck. 



Peltidium interruptum, Brady. 



conophorum, Poppe. 



Specific Characters. Female. Body rather compact, somewhat vaulted 

 above, and capable of rolling itself into a ball; seen dorsally, oval pyriform in 

 outline, with the greatest width in front of the middle, and gradually tapering 

 behind. Cephalic segment occupying about half the length of the anterior division, 

 postero -lateral corners rounded, rostral projection short, deflexed, obtuse at the 

 tip. Epimeral plates of the 3 succeeding segments only slightly produced at the 

 posterior corners; those of last segment well defined, though less prominent than 

 the preceding ones, and evenly rounded at the tip. Urosome short and flattened, 

 with the genital segment broad and expanded in front, clypeiform ; postero-lateral 

 corners of this and the 2 succeeding segments conically produced. Caudal rami 

 only .slightly longer than they are broad, subquadrangular in form, and obliquely 

 truncated at the tip, the innermost but one of the apical setae much dilated in 

 its proximal part. Eye large, placed near the frontal margin. Anterior antennae 

 rather slender, 8-articulate, 2nd joint much the largest. Posterior maxillipeds 



