Annelida of the Bermudas. 637 



Length, in life, over a foot ( + 300'"™). 



Breadth of a large but imperfect specimen, in the branchial 

 region (40th segment) is 9'"™ ; of buccal segment, 4™™. 



Heteroraarphysa, gen. nov. 



Body slender ; five antenna? (or tentacles) and a pair of separated 

 ventral palpi. Head rounded in front. Eyes 4, well-separated. 

 Buccal segment lai'ge, united to the head dorsally, and to the next 

 segment without a visible suture (as preserved). Branchiae lacking. 

 Setae of several sorts — compound, capillary, and uncinate ; ventral 

 ones in the anterior fascicles, compound. Jaws similar to those of 

 Paramarphysa. 



Heteromarphysa tenuis, sj). nov. 



Slender and rather long, with elongated segments, separated by 

 constrictions, except the first four, which are nearly continuous, 

 (perhaps due to imperfect preservation). 



Head about as broad as long, obtusely rounded in front, with a 

 minute median emargination ; posterior margin more broadly 

 rounded ; widest behind the middle. Eyes 4, small, black, nearly 

 equal, nearly in a square ; the anterior ones situated close to the 

 anterior margin ; the others, rather farther apart, are behind the 

 outer antennae. The palpi are rounded, about as long as wide. 



The jaws are mostly soft and light colored, but appear to agree 

 closely with those of Paramarphysa. 



Antennae very long and slender, tapered, acute, smooth, not artic- 

 ulated, but attached to a large and long base. The inner paired 

 ones are the longest, being about 5 times the breadth of the head ; 

 odd one somewhat shorter ; outer ones about one-quarter the length 

 of the longest. 



The buccal segment is wider than the head and continuous with it. 



Two tentacular cirri are present on one specimen ; they are very 

 long and slender. The larger specimen has 47 segments, but the 

 posterior end is gone. Another smaller entire one has 38 segments. 



The parapodia are longest and largest on the anterior segments, 

 decreasing rapidly, but not abruptly, in length after about the 7th. 



The dorsal and ventral cirri are about equal on the anterior six 

 segments, rather long, tapered, enlarged at base and tapered dis- 

 tally. On following segments the dorsal cirri become gradually 

 shorter and thicker, and are nearly obsolete after the 12th, but the 

 ventral cirri become smaller and more slender and continue to the 

 end of the body. 



