short and biannulate and thorax distinguished 

 from abdomen only by nature of setae. An 

 achaetous peristome followed by 14-15 seti- 

 gerous segments bearing capillaries only or 

 capillaries and hooks. Abdominal segments 

 without branchial projections, and all bearing 

 hooded hooks; hook-rows all short and well 

 separated. Individual hooks with hoods as 

 broad as long and with three denticles in a 

 triangle above main fang. 



R< nuirks. — The material from North Carolina 

 differs in some respects from Hartman's original 

 descrijjtion and appears to provide a link be- 

 tween L. (jlabra and L. atluntica. The distribu- 

 tion of the thoracic setae differs in all four 

 specimens. The first neuropodium may bear 

 capillary setae on one side and not on the 

 other, or the first two neuropodia may lack 

 setae on one side or all the anterior setae may 

 be present. Similarly, hooks may be restricted 

 to the last thoracic neuropodium or the last 

 two thoracic neuropodia. The four formulae are 

 given below; 



P+ 15C ^ 



(CorO) + (CorO) + 12C + IH 



15C 



^ ^ 13C + (CorH) + (CorH) " ^^'' 



P + liC ^ 15. 



(CorO) + 12C + IH 



14C 



P + IQP -I- IH =15. 



Hartman's original description of L. glabra 

 was based on two specimens. Both lacked 

 setae in the first neuropodium on both right 

 and left sides, but one had capillaries in the 

 notopodia of 14 segments behind the peristome, 

 while the other had both capillaries and hooks 

 in the 15th segment behind the peristome. 



The thoracic formulae are thus; 



14C 



P + 



14C + (Cand H) 



+ 12C 



2H 



16. 



Mailman's description of L. athuitica from 

 slope depths off Massachusetts gives the fol- 

 lowing formula; 



P + 



14C 



= 15. 



P + 



+ 12C + IH 



15 and 



+ lie + 2H 



If all the specimens are considered together 

 it becomes obvious that the distribution of setae 

 on the thorax is very variable; both capillaries 

 and hooks may occur in the same fascicle, setae 

 may be present on one side and not the other 

 or hooks may replace capillaries in the neuro- 

 podia of one or two segments at the end of the 

 thorax. It is best to consider the whole group 

 as one variable species with 15 or 16 thoracic 

 .segments, with neurosetae usually lacking 

 from the first setiger and with hooks replacing 

 the capillaries in the last one or two neuropodia. 



/?,-(.o,y/.s.— Off Beaufort in 40-80 m (*). 



Dist)'il)i(ti()ii. — Southern California to the 

 Pacific coast of Mexico; Massachusetts; in 

 40-200 m. 



DasybranchuH lumbricoides Grube. 1878 



Dasybi'aiicliiis In nibricniih s. - Hartman, 1947a; 

 431. pi. 56; Fig. 3, 4; 1951: 103; 1969; 373, 

 Fig. 1-3. 



Rtcordx. — Cape Hatteras to Beaufort, inter- 

 tidal in muddy sand (5, 11, 12, 13. 18, *). 



Dixtributiiiii. — Philii)))ine Islands; Galapagos 

 Islands; California to Mexico and Florida to 

 North Carolina in intertidal mud. 



Dasybranchus lunulotiis Ehlers, 1887 



D(isiil))-aiirhiis In iiiilatiis. - Hartman, 1947a: 432, 

 pi. 56; Fig. 1,2; 1951; 103. 



Rccards. — Beaufort, intertidal (12, 13). 

 Distribntidii. — North Carolina, Florida, and 

 Puerto Rico; intertidal to 4 m in niuddv sand. 



101 



