AKT. II. A. IZUKA : 



where a slightly median sinus divides it into two broadly rounded 

 lobes from which the sides slope caudad to somewhat narrower, 

 straight posterior border. Anterior pair of eyes very large, blaclc, 

 situated on the anterior face of prostomium close to the lateral 

 angles. The posterior having a diameter of only J the anterior, 

 black, circular. Median and lateral tentacles absent ; palpi lost. 



Tentacular cirri lost. 



The six parapodia following the 

 peristomium are broad and very short ; 

 the next (of 8th segment) is decidedly 

 longer, and from this on to 24th they 

 continue to increase gradually in length. 

 On segments 9th to 20tli the dorsal 

 ramus of the parapodium forms a rather 

 conspicuous broad flap, wdiich passes 

 down the dorsal lialf of the anterior 

 face of the parapodium, and from be- 

 hind which the capillary bristles arise. 

 Dorsal angle of the ventral ramus pro- 

 minent and rounded ; the ventral angle 

 enveloped by tlie lower end of the 

 postsetal fold. The dorsal ramus be- 

 comes gradually reduced in size ; by 

 25th it is a mere dorsal papilla. 



At least 12 pairs of elytrophores 

 are present on the segments : 2, 4, 5 



A. Stout ventral bristle. 332/1. 



B. Slender ventral bristle. 332/1 

 0: Capillary bristle. 332/1. 



[After J. P. Mfjore]. 



and every alternate segment to 2 



so 



inclusive. 



Four kinds of bristles occur on 

 typical segment (10th). The first kind colourless, long, slender, 



