BIHANG TILL K. SV. VET.-AKAD. HANDL. BAXP 10. iN:0 10. 7 



tliere is a deep excavation for tho reception of the femiir 

 of the corrcspouding leg. 



Tlie jio'st pair of pereiojjoda (Pl. I. fig. 8). The epiraeral 

 of the first segment is not distinct, but the börder of this 

 segment goes down as dcep as the cpimeral of the second 

 (Pl. I. fig. 11). The femur is broad, thick, and convex, a 

 little narrower at the iipprer end. At the outer margin it 

 carries two very loug hairs, at the inner lower corner a short 

 stout spine. The yenu is long, more than two thirds of the 

 femur, sraooth. The tihia is not half the length of the pre- 

 ceding joint, and carries at the outer lower corner a bundle 

 of long linear bristles, bent at the tip and serrated (Pl. I. 

 fig. 9). The carpus is short, of about the same length as 

 the preceding joint, without hairs or bristles. The meta- 

 carpus is long and stout, longer than the two preceding joints 

 together. At its lower end it is extendcd into a semicircu- 

 lar process for the articulation with the dactylus. This pro- 

 cess has the same structure as that described in Aegiochus;^) 

 and is a peculiar apparatus existing in all the AegidaB I have 

 examined. The dactylus is strong and powerful, bent as 

 a hook. 



The second p>air of pereiopoda. The epimeral is distinct 

 from the segment, large, straight as to its anterior, upper, 

 and posterior margins, feeblv curved as to the under mar- 

 gin. 7'he femur is longer than in the preceding pair, broad, 

 linear, smooth. The genu is about half the length of the 

 femur, smooth. The tihia is nearly half the length of the 

 genu and carries some straight bristles at the outer mar- 

 gin. The carpus is a little shortcr than the preceding joint, 

 smooth. The metacarpus is much longer than the two pre- 

 ceding joints together, and of exactly the same structure as 

 in the first pair. The dactylus is less strongly curved than 

 the dactylus of the first pair. 



Tlie third, pair of pereiopoda (Pl. I. (ig. 10) rcsemble very 

 nearly the second pair but are a little longer and more slcndcr. 



71ie fourth pair of pereiopoda (Pl. II. fig. 13) are tlie first 

 and shortcst pair of walking legs. The epimeral is small 

 and does not occupy more tlian the anterior half of the 



') Bihang till Kongi. Vetcnsknps- Akademiens FTandlingar. P.and 10. 

 N:o 9 pag. 8. 



