AMPHINOME LONGOSETOSA, i6i 



small irregular areas ; on the ventral side there is a shallow, 

 median , longitudinal groove. The 2^^^ segment is fur- 

 nished on its dorsum with a transverse row of prominent 

 warty rugae. The tongue-shaped caruncle terminates at the 

 hinder margin of the first segment; it is attached along 

 the middle, the edges being free. The median unpaired 

 tentacle, bend backward, not extends to the hinder end 

 of the caruncle; the paired tentacles are a little shorter, 

 about as long as the palpi. Each foot bears a rather long , 

 conical dorsal cirrus ; the ventral cirrus is short. The bran- 

 chiae commence on the Si"*! body-ring; they arise from the 

 posterior part of the dorsal bristle-papilla with a short 

 broad stem , dividing in several secundary branches , which 

 give rise to a dense bush of filaments. On the first bran- 

 chiferous segment the branchiae approach each other on the 

 middle of the dorsum , but on the following segments they 

 are separated by a large distance until the beginning of the 

 posterior third of the body, where they meet again and 

 farther cover the whole dorsal side , except in the region of 

 the anus, a wide oval opening, embracing nearly 10 seg- 

 ments. The upper border of the dorsal bristle-papilla is 

 fringed at the anterior side, opposite to the cirrus. 



Besides the normal bristles of A. rostrata we find here 

 in the dorsal fascicle the slender capillary bristles, above 

 referred to , exceeding the ordinary bristles often five 

 times in length. We can distinguish four kinds of them : a. 

 stout dark brown bristles, very thick at their base, ta- 

 pering to the tip and beset over their whole length with 

 large , widely distant spines , growing longer and thinner 

 near the distal end of the bristle; some of them measure 

 27 mm. in length and have near their base a diameter of 

 0,09 mm. — b. light brown bristles, with a thick fusiform 

 base, the tip tapering to a fine point; they possess alter- 

 nate spines , decreasing not much in length from the distal 

 end to the base. — c. slender white bristles , fusiform at 

 their base, tapering to the tip, which is furnished with 

 long , densely crowded , alternate setae , forming a kind of 



I^otes from the Ley den IMuseum , "Vol. "VIU. 



