BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 10. N:0 9. 11 



pleon, forming a broad embrasure on both sides of the hollow, 

 wliich contains the pleopoda. The first segment of tl\e pleon 

 is shorter than the following; the middle of it is totally con- 

 cealed under the last pereional segment ; its lateral parts 

 extend backwards, and are sharply pointed. The second, third 

 and fourth segments are equal in length, but decreasing in 

 breadth. The lower parts of the sides are prolonged down- 

 wards, but less acutely pointed than in the first segment. 

 The fifth segment is considerably longer than the fourth, 

 the posterior margin is straigth. 



The first pair of pleopoda [Pl. II. fig. 23]. The peduncle 

 is robust, hairy on its inner margin. The outer lamina is a 

 little longer than the inner, and fringed with longer ciliated 

 hairs. 



The secoiid pair [Pl. II. fig. 24]. The peduncle is shorter 

 than the preceding one, armed at the inner margin with some 

 thick peculiar (secretory?) bristles, not pointed; on the outer 

 margin it carries a row of short hairs. The lamin?e are longer 

 than those of the first pair and more regularly ovate, fringed 

 with long ciliated hairs. The inner lamina carries a long 

 styliform process, articulating with its upper inner corner. 

 The process is tapering slightly towards the end, which is 

 undulated. At the lateral margins it carries very short bristles, 

 fixed on small prominences of the margins. [Pl. II. fig. 25.] 



The third, fourth and fifth pairs of pleopoda are subequal, 

 with broader and more rounded laminae. The inner lamina 

 of each foot shows traces of being transversally divided. 

 [Pl. II. fig. 26 and 27.] 



The urus [Pl. I. fig. 1] is a little broader at the base 

 than long; at the anterior corner on each side is an insertion 

 for the articulation of the uropoda. The lateral margins are 

 feebly curved, and the segment ends in a sharp point. The 

 posterior parts of the lateral margins are serrated, the teeth 

 again serrated, with fine ciliated hairs and short strong spines 

 on and between the teeth. [Pl. II. fig. 30]. On the upper 

 side the urus is provided with very small tubercles, and 

 between these there are smaller granulse, all of the same 

 white colour as the rest of the body. 



The uropoda [Pl. II. fig 29]. The peduncle is short, 

 broad at the hinder margin, the inner corner projecting in a 

 triangulär process. This process does not reach to the half 



