220 AKT. II. — A. IZÜKA : 



tapering free extremity. Median tentacle cylindrical, and about 

 equal in tliickness to dorsal cirri. Eyes 2 on dorsal side, one 

 on each side of the base of median tentacle. Another pair of 

 triangular eyes occur on the ventral surface of the narrow 

 cephalic lobe. Six dorsal cirri belonging to the first six body- 

 segments are found on each side of the caruncle. Two prominent 

 fleshy lobes on the anterior border of mouth measure about 4 mm. 

 in length ; their breadth, taking the two together, less than 

 the length. Each lobe somewhat semicircular in shape, with 

 straight inner and convex outer border ; on the sides of the latter 

 lie 4 body- segments. Posteriorly the mouth-opening is bordered 

 by the 5tli and 6th segments. 



A row of 8 branchial tufts occur on each lateral half of the 

 dorsal surface of segments ; the lateralmost tuft the largest, but 

 none of the tufts reaching to tip of bristles. Each branchial tuft 

 arises as a short and stout stem, and soon divides into 3-5 (or 

 rarely more) short branches, which again divide into branchlets. 

 Just behind and a little outside the lateralmost branchial tuft, 

 there arises a large bundle of bristles ; and inferiorly to these 

 there arises a short ventral cirrus. Dorsal cirri are situated in 

 front of the 1st branchial tuft and of the interspace between the 

 3rd and 4th branchial tufts, in the line of the row of bristles ; 

 they are nearly equally long as the branchiae. Large dorso- 

 lateral bundle of bristles lies posteriorly to lateralmost branchia, 

 while the dorsal row of bristles are in front of branchial tufts. 



Bifid dorsal bristles are of two kinds : — those smooth in tlie 

 fissure (PI. XXII, fig. 1.) and those crenated in same (PI. XXII, 

 fig. 2.). Bifid ventral bristles are all smooth. 



Anal cirri present in a pair, tongue-like, about 2 mm. in length 

 and 1.5 mm. in breadth. 



