BIHANG TILL K. SV. VET. AK.\U. HANDLINGAR. BANU. 4. N:0 8. 23 



a thicker, stronger basa) part and a flexible termination , 

 wavy in the margin (1'1. IV, fig. 75 a); they are plumelike 

 ciliated. 



Tlie uropoda or pedes scdtarorii are also, in accordance 

 with the mode of living of the animal, constructed into 

 furrowing organs with thick miiscular peduncles, and short, 

 strong, cylindrical branches, armed with spines. All of them 

 are dirccted upwards, when the itrus is bent outwards (Pl. III, 

 fig. 42). Tlie first pair is the longest, it reaches almost to 

 the tip of the last pair. The peduncle is long, thickest in 

 the fore-end, decreasiug in breadth towards the back one, 

 broad, crescentlike arched. The vipper, concave side carries 

 long spines with a small feeling-hair near the point (Pl. III, 

 fig. 19). The branches are shorter than the peduncle, trun- 

 cate in the points and carryiug there and on the sides spines, 

 and, along the outer side, a row of straight, stiff, smooth brist- 

 les. The second pair has the peduncle straight but twojointed; 

 the first joint is a little longer than broad, strongly fastened 

 to the segment, without bristles and spines. The second 

 joint is oval with straight, minutely ciliated or denticulated 

 (Pl. IV, fig. 67), and long thinly ciliated bristles. The bran- 

 ches are about as long as the second joint, rounded in the 

 points; they are beset with long bristles, denticulated on one 

 side. The tliird pair (Pl. III, fig. 52) is about of the same 

 length as the preceding, the peduncle is somewhat short, and 

 carries in the posterior angles spines with bristles (Pl. III 

 fig. 51). The branches are broadest at the base, truncated in 

 the points, of different length. The outer branch is the lon- 

 gest, composed of two joints, its first joint carries oa the outer 

 side and in the outer angle stiff, smoth bristles, in the in- 

 ner long, slender spines of the shape, described in the uro- 

 poda (Pl. III, fig. 19); the second joint is shorter than the 

 first one, and carries in the point stiff", smooth bristles and 

 spines. The inner branch is a little longer than the first 

 joint of the outer one, carries on the inner side a group of 5 

 spines and in the point bristles and spines as the outer branch. 



The telson is broader than long, divided to about the half 

 of its length, the sidelobes are broad, truncated at the po- 

 sterior end, armed with spines, partly pointed and partly obli- 

 quely cut (Pl. III, fig. 27). 



