ON A NEW SPECIES OF DEEP-SEA POLYCH^ETA. 



29 



Explanation of the Figures in Plate I. 



bt. Branchial tubercles. 



dc. Dorsal cirrus. 



e. Elytrum. 



j. Jaws of the proboscis. 



mp. Long median papilla of the proboscis. 



mt. Median tentacula. 



o. Ommatophore. 



p. Papilke on the lips of proboscis. 



pt. Paired tentacula. 



st. Sutentacula. 



tc. Tentacula. 



vc. Ventral cirrus. 



Fig. I. Ventral view of the anterior portion of the body of Panthalis 

 Mitsukurii, nov. sp., with completely protruded proboscis. About 2/1» 



Fig. 2. Dorsal view of the head and of a few anteriormost segments- 

 About 4/1. 



Fig. 3. One of the four chitinous jaws of the proboscis. 

 Fig. 4. Right parapodium of the 23rd segment, bearing an elytrum. 

 Posterior view. 



Fig. 5. Right parapodium of the 38th segment, bearing a dorsal cir. 



rus. Posterior view. 

 Fig. 6. Spine-like seta;. 85/1. 

 Fig. 7. Setae bipennato-penicillata;. 1 7 5/ r . 

 Fig. 8rt and 8/'. Setae serrulatae. 1 75/ 1 . 



